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PMC730 User`s Manual

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3. 0 001 of FSR Maximum Offset 550u Volt Maximum Gain 0 024 Maximum Settling 7u seconds Typical to 0 01 Note 5 Software calibration minimizes these error components Calibration Reference Voltages Maximum Tolerance 25 C Volts Calibration Voltage Maximum Temperature Drift ppm 9C 6 Thecalibration voltages are not set precisely to these voltages The actual calibration voltages must be read from the calibration coefficient memory of the PMC730 module see Table 3 13 7 total of 512 input samples were averaged with throughput Rate of 200khz conversions second 8 Worst case temperature drift is the sum of the 10 ppm C drift of the calibration voltage reference plus the 10 ppm 9C of series resistor R2 plus the 5 ppm 9C drift of the resistors in the voltage divider 35 Maximum Overall Calibrated Error 25 C The maximum corrected i e calibrated error is the worst case accuracy possible It is the sum of error components due to ADC quantization of the low and high calibration signals PGA and ADC linearity error and the absolute errors of the recommended calibration voltages at 25 C ADC Typ Err LSB Range Volts Span 5 LSB 3 33 to 3 33 0 007 0 0111 0 007 7 13 LSB 2 LSB 0 0108 0 0031
4. where represents the actual slope of the transfer characteristic as defined in equation 2 Volt Volt CALHI CALLO m 2 Count Count CALHI CALLO Voltc AI Hi High Calibration Voltage See Table 3 7 Voltc Ai 10 Low Calibration Voltage See Table 3 7 CountcALHI Actual ADC Data Read With High Calibration Voltage Applied Actual ADC Data Read With Low Calibration Voltage Applied Ideal ADC Voltage Span See Table 3 8 Actual Uncorrected ADC Data For Input Being Measured Ideal ADC Input For Zero See Table 3 8 Ideal Volt Span Count Actual Ideal Zero 16 Table 3 7 Recommended Calib Voltages For Input Ranges Rec Low Rec High Calib Voltage Calib Voltage VoltcA Volte Volts Volts Auto Zero 0 0000 4 94 Auto Zero 0 0000 Auto Zero 1 23 ADC Range Volts 3 3 to 3 3 9 88 10 to 10 0 to 5 4 94 0 to 10 1 23 9 88 Table 3 8 Ideal Voltage Span and Zero For Input Ranges ADC Range Ideal Volt Ideal Volts Span Zero Volts Volts 3 33 to 3 33 6 6666 3 333333 The calibration parameters Countc a and Countca for each active input range should not be determined immediately after startup but after the module has reached a stable temperature and updated periodically e g once an hour or more often if ambient temperatures change to obtain the best accuracy Note t
5. 4 ALON 33S NONWWOO 0 35535 1 1 AlddNS Y3MOd 1Y NOILO3NNOO ANNOYS OELINd a EHO bo 22 LU TE 253 QNvOG ndo 7 e 9 2 v 310N 335 WVYOVIG NOILOJNNOO SOVITOA 939 3 319NIS NOWWOO ze 3LON 335 Z ALON 335 A qTHS 1 NONWOO 901 eae T SLHO 9153 a 10H2 7 L HO 193 M HO N HO 653 5314499 VU 310N 335 2 WVYYOVIC NOLLO3NNOO 39VLIOA IVILN383443IQ 41 MULTIFUNCTION MODULE SERIES PMC730 PCI MEZZANINE CARD 016 3OVdH3 NI 9I901 Old LOGY 94 42018 NONWOO NOWNOD MIO DOWN 45 INdLNOINNOOD Y3LNNOD 1hdino 18 28 i ol PS 1 NOLLOSTES 9I50110HLNO2 UINL 1 lt 8 gt lt 4 gt OL8STANNVHO 2901 um JOULNOD LNd LNO IndN lt gt
6. 14 ADC Start Convert Register 15 ADC Memory 15 Uncalibrated ADC Performance 16 Calibrated ADC Performance 16 DAC MODES OF 17 DAC Single Conversion 17 DAC Continuous New Data Conversion Mode 17 DAC Recycle Same Data Conversion Mode 17 DAC Control Status 18 DAC Conversion Timer 18 DAC FIFO Interrupt 19 DAC Start Convert 19 DAC FIFO Write 19 DAC Uncalibrated 19 DAC Calibration Performance 20 Digital Input Output Registers 21 Digital Direction Control Register 21 Digital Interrupt Enable Registers 21 Digital Interrupt Status Registers 21 Interrupt Type COS or H L Configuration Register 21 Interrupt Polarity 21 Debounce Duration Select and Enable Register 22 COUNTER TIMER MODES OF OPERATION 23 Pulse Width
7. Complies with IEC1000 4 4 Level 2 0 5KV at field input and output terminals and European Norm 50082 1 Radiated Emissions Meets or exceeds European Norm EN50081 1 for class A equipment Warning This is aclass A product In a domestic environment this product may cause radio interference in which the user may be required to take adequate measures Note 3 Reference Test Conditions Temperature 25 C 50K conversions second using a 2 meter shielded cable length connection to the field analog input and output channels Reliability Prediction Mean Time Between Failure MTBF 929 541 hours 9 25 C Using MIL HDBK 217F Notice 2 ANALOG INPUTS Input Channels Field Access 32 Single ended or 16 Differential Input Ranges DIP switch Bipolar 3 3 to 3 3 Volts selectable Bipolar 5 to 5 Volts Bipolar 10 to 10 Volts Unipolar 0 to 5 Volts Unipolar 0 to 10 Volts Note 4 Input signal ranges may actually fall short of reaching the specified endpoints due to hardware limitations If an input may reach zero volts or less a bipolar input range should be selected Differential inputs require two leads and per channel and provide rejection of common mode voltages This allows the desired signal to be accurately measured However the signal being measured cannot be floating It must be referenced to analog common on the PMC module and be within the normal input voltag
8. Counter Readback Reg Gives the Count value at the time of the read Gives the Count value at the time of the read Gives count value reflecting pulse measured Gives count value reflecting period measured Interrupt Notes Table 3 12 1 Debounce Available Through Digital Control Register On Edge Transitions On Terminal Count of 0 Upon reach of count limit 25 Upon end of pulse measurement Upon end of period measurement On Edge Transitions SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Counter Control Register Read Write Base 50H This register is used to configure counter timer functionality for the 32 bit timer This register defines the counter mode output polarity input polarity external trigger polarity trigger source interrupt enable clock source internal or external counter load selection gate off enable and polarity Table 3 13 Counter Control Register 210 0 000 Disabled 6 110 Input Period Measurement 7 111 One Shot Pulse Mode Polarity Output i RD Level O0 Active LOW Defaut 7 Input Event Polarity lom enne 2 20__ Disabled _ Active LOW Active HIGH Disabled EXE Trigger A When 7 Set to 1 0 High to Low Default O Trigger Source Software Generated via Counter Trigger Control Register External input on Counter Trigger
9. This read only register is a dynamic function register that returns the current value held in the counter The contents of this register is updated with the value stored in the internal counter each time it is read The internal counter is generally initialized with the value in the Counter Constant Register and its value is incremented or decremented according to the application For event counters this register holds the current number of events that have occurred since triggering the event counter For input pulse width or period measurement this register holds the measured pulse width or periodic rate of the input signal in number of clock cycles In watchdog counting mode this register holds the number of clock cycles that remain since triggering the timer and until a watchdog timer time out will occur These registers are cleared set to 0 following a system or software reset Reading this register is possible via 32 bit long word accesses only Counter Constant 1 Register Write Only Base 58H This write only register is used to store the counter timer constant 1 value initial value for the various counting modes Accesses to this register are allowed on a 32 bit long word basis only This is necessary to allow the constant value to be loaded into the counter in one clock cycle For event counters this register is used to set the maximum count value Upon reaching this count value an interrupt can be generated
10. In order to support burst data reading of ADC data two 512 sample memory buffers are used While one buffer functions to acquire new digitized data the other functions as a read buffer Data can be read at burst rates via the PCI bus to obtain new converted data When the number of new input digitized data samples exceeds the Memory Threshold value the two memory buffers switch functions Since all channels share the same memory channel data tagging is implemented The tag value identifies the channel to which the data corresponds The hardware tags each memory location with a channel number so the data can easily be matched with its source channel The Memory samples are 21 bit data values The least significant bits 15 to 0 represent the digitized data while bits 20 to 16 represent the channel tag Care should be taken when reading data from the memory buffer To insure the memory buffer data is valid the Transition Status bit bit 15 of the Control Register can be polled The Transition Status bit will be set when valid data is available in the memory buffer The Transition Status bit is cleared upon the first read of the memory buffer and will not be set again until the memory buffers switch based upon the Threshold register value Alternatively an interrupt upon threshold met condition can be used to start reading of valid data Reading of the Memory is possible via 32 bit 16 bit or 8 bit data transfers SERIES PMC730 P
11. Monitors up to 16 differential or 32 single ended analog input signals The acquisition mode and channels are selected via programmable control registers Two 512 Sample Memory Buffers Two 512 sample deep memory buffers are available for ADC operation to reduce CPU interactions While new digitized data is written to one memory buffer data can be read from the other at burst data rates This allows the external processor to service more tasks within a given time Data tagging is also implemented for easy channel data identification ADC Memory Buffers Switch Condition When the number of new data samples exceed a programmable threshold value the input buffer switches to the data read buffer which allows reading of the new data The old read buffer will simultaneously switch from the data read to the data input buffer Scan Modes The scan modes Uniform Continuous Uniform Single Burst Continuous Burst Single and External Trigger Only can be selected via a programmable control register e interrupt Upon Reaching a Memory Threshold Condition An interrupt can be generated when the number of new data samples reaches a programmable threshold condition This feature can be used to minimize CPU interaction e Programmable Conversion Timer A programmable conversion timer is available to control the time between conversion of each channel when Uniform Continuous or Single Scan modes are selected If Burst C
12. The configuration of the DIP switch for the different ranges is shown in Table 2 1 A switch selected as ON would be positioned to the side of the DIP labeled ON The DIP switch location is shown in Drawing 4501 911 Table 2 1 Analog Input Range Selections DIP Switch Settings Desired Required Required Switch Switch ADC Input Input Span Input Settings Settings Range VDC Volts Type ON OFF CONNECTORS Connectors of front I O modules PMC730 and PMC730E consist of one 68 pin front panel SCSI 2 field connector and two 64 pin PCI local bus connectors Rear PMC modules PMC730R and PMC730CO consist of three 64 pin PCI local bus connectors These interface connectors are discussed in the following sections Front Panel Field I O Connector The front panel connector provides the field I O interface connections It is a SCSI 2 68 pin female connector AMP 787082 7 or equivalent employing latch blocks and 30 micron gold in the mating area per MIL G 45204 Type II Grade C Connects to Acromag termination panel 5025 288 from the front panel via round shielded cable Model 5028 432 Table 2 2 PMC730 Field I O Pin Connections Pin Description Pin Pin Description Pin Counter Output COMMON ADC Trigger In ADC Trig Out DAC Trigger In DAC Trig Out Counter Input Counter Output Coume mgin Counter Trig In Dig CH4 Digital CH12 00807 Counter Ga
13. installed and the drain supply jumper is present Bit 3 specifies the active output polarity when the output is driven Bit 11 can be used to select whether the watchdog timer counter is to be loaded from the Counter Constant Register via an external input pulse 250ns minimum pulse width on the Counter Input pin digital channel 2 or automatically upon writing to the Counter Constant Register In any mode except watchdog when you write to the Counter Constant Register the internal counter register will be written with the same value at the same time In watchdog mode if bit 11 is set to O default the watchdog timer counter will be loaded internally from the Counter Constant Register automatically upon a direct write to the Counter Constant Register However if bit 11 is set to 1 then the watchdog timer counter will not be loaded from the Counter Constant Register until initiated by applying a minimum 140ns pulse polarity is programmable via bit 4 to the external Counter Input pin digital channel 2 Bit 12 when read high 1 identifies a pending interrupt from one of the following counter functions 1 Watchdog 2 Event Counter 3 Input Pulse Width Measurement 4 Input Period Measurement 5 Pulse Width Modulation or 6 One Shot generation Writing a logic 1 to bit 12 will release a pending interrupt An interrupt caused by the Watchdog function must first be cleared by disabling Watchdog mode or by reinitia
14. the PMC730 analog input module use of the shortest possible length of shielded input cable is recommended Cables Model 5028 432 A 2 meter round 68 conductor shielded cable with a male SCSI 3 connector at both ends and 34 twisted pairs The cable is used for connecting the PMC730 module to Model 5025 288 termination panels Termination Panel Model 5025 288 DIN rail mountable panel provides 68 screw terminals for universal field I O termination Connects to Acromag PMC730 via SCSI 8 to twisted pair cable Model 5028 432 PMC MODULE ActiveX CONTROL SOFTWARE Acromag provides a software product sold separately consisting of PMC module ActiveX Object Linking and Embedding drivers for Windows XP 2000 98 956 and Windows NTG compatible application programs Model PMCSW ATX MSDOS format This software provides individual drivers that allow Acromag PMC modules to be easily integrated into Windows application programs such as Visual C Visual Basic Microsoft Office 97 applications and others The ActiveX controls provide a high level interface to PMC modules eliminating the need to perform low level reads writes of registers and the writing of interrupt handlers all the complicated details of programming are handled by the ActiveX controls These functions consist of an ActiveX control for each Acromag PMC module PMC MODULE VxWORKS SOFTWARE Acromag provides a software product sold separately consisting of
15. 1 FIFO Full Status 1 Status DAC Conversion Timer Register Read Write Base 24H 4 5 12 13 14 5 DAC conversion control has its own dedicated Conversion Timer register The value stored in the Conversion Timer Register controls the interval time between conversions Read or writing the Conversion Timer register is possible with either 32 bit 16 bit or 8 bit data transfers This register s contents are cleared upon reset The DAC Conversion Timer value number is divided by an 8MHz clock signal The resulting frequency can be used to generate periodic triggers for precisely timed intervals between conversions The time period between trigger pulses is described by the following equation DAC Conversion Timer Value 3 8 000 000 Hz seconds Where T time period between trigger pulses in seconds DAC Conversion Timer can be any value between 96 and 16 777 212 decimal The maximum period of time which can be programmed to occur between conversions is 16 777 212 3 8Mhz 2 0971 seconds The minimum time interval which can be programmed SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE to occur is 96 3 8 12 375 seconds This minimum of 12 375 seconds is defined by the minimum conversion time of the hardware The following equation can be used to calculate the DAC Conversion Timer value Note this gives the value in decimal It must still be converted to hex before it i
16. 12 375usec and a maximum interval of 2 09 seconds Single Conversion Mode Output channels can be individually updated Other channels not updated maintain their previous analog output value Analog output can be triggered for update via software or external trigger e External Trigger Scan Mode All channels simultaneously implement a new conversion with each external trigger This mode allows synchronization of conversions with external events that are often asynchronous e External Trigger Input or Output An external trigger signal is available through the digital input output channels This signal can be used to synchronize operation with other modules when used as an output As an input the signal can be used to initiate new conversions e Reliable Software Calibration Calibration coefficients stored in on board memory provide a means for accurate software calibration for both gain and offset correction for all eight analog output channels Reset is Failsafe For Analog Output The analog output channels are reset to 0 volts upon power up or issue of a software or hardware reset KEY PMC730 COUNTER TIMER FEATURES e 32 Bit Counter Timer A multifunction 32 bit counter is provided for implementation of waveform generation event counting watchdog timing pulse width measurement or period measurement Output Waveform Generation The counter can be programmed for pulse width modulation and square wave gene
17. 23 Watchdog Timer 23 Event Counting 23 Input Pulse Width 24 Input Period 24 One Shot Pulse inen Lee ee 24 Counter Control 26 Counter Readback Register 27 Counter Constant 1 Register 27 Counter Constant 2 Register 27 Counter Trigger Control Register 27 Calibration Access 28 Calibration Read Data Status Register 28 4 0 THEORY OF 29 LOGIC POWER 29 PCI INTERFACE rrene 29 ADC CONVERSION CONTROL LOGIC 29 DAC CONVERSION CONTROL LOGIC 31 COUNTER TIMER CONTROL LOGIC 32 DIGITAL INPUT OUTPUT 32 PMC Module 32 5 0 SERVICE AND REPAIR 33 SERVICE AND REPAIR 55 5 33 PRELIMINARY SERVICE 33 6 0 34 PHYSICA 3
18. PMC module VxWorks drivers This software Model PMCSW API VXW MSDOS format is composed of VxWorks real time operating system libraries for all Acromag PMC modules The software is implemented as a library of functions which link with existing user code to make possible simple control of all PMC modules PMC MODULE QNX SOFTWARE Acromag provides a software product sold separately consisting of PMC module QNX drivers This software Model PCISW API QNX MSDOS format is composed of QNX real time operating system libraries for all Acromag PMC modules The software is implemented as a library of C functions which link with existing user code to make possible simple control of all Acromag PMC modules 2 0 PREPARATION FOR USE UNPACKING AND INSPECTION Upon receipt of this product Inspect the shipping carton for evidence of mishandling during transit If the shipping carton is badly damaged or water stained request that the carrier s agent be present when the carton is opened If the carrier s agent is absent when the carton is opened and the contents of the carton are damaged keep the carton and packing material for the agent s inspection CAUTION SENSITIVE ELECTRONIC DEVICES DO SHI OR STORE NEAR STRONG ELECTROSTATIC ELECTROMAGNETIC MAGNETIC OR RADIOACTIVE FIELDS For repairs to a product damaged in shipment refer to the Acromag Service Policy to obtain return instruction
19. Temperature 15 bits Linearity Error 2LSB System Accuracy 3LSB Note 14 Offset and gain calibration coefficients stored in coefficient memory must be used to perform software calibration in order to achieve the specified accuracy Specified accuracy does not include quantization error and is with outputs unloaded at 25 C Conversion Time per channel Settling 12 375uSec 1205 to within 0 01 of FSR for a 18V step change load of 2KQ in parallel with 8pF Note 15 The conversion time includes the time from software start convert or external trigger until a Load DAC signal goes active To obtain the overall time to the point when the signal settles to 0 01 of FSR the settle time must be added to the conversion time However for continuous conversions the conversion time and settle time will overlap so continuous conversions can be performed every 12 375uSec Output at Reset Bipolar Zero Volts Output 2mV rms in a 20MHz bandwidth Typical Short Circuit Protection Indefinite at 25 C 36 Maximum recommended capacitive load is 100pF Capacitive loads up to 0 01 uF can be tolerated but with additional overshoot Offset Voltage Error 34 2mV 25 C Gain Voltage Error 62mV 25 C Offset Voltage Drift 84uV C Gain Volta
20. These configuration registers control the 12 PMC730 on board multiplexers which control the channel selected for the input to the converter In the external trigger only mode it is important to understand the sequence in which converted data is transferred from the ADC to the Memory buffer Upon an external trigger the selected analog signal is converted but remains at the ADC while the previous digitized value is output from the ADC to the Memory buffer Thus with this sequence the Memory is consistently updated with the previous cycle s converted data In other words new data in the Memory buffer is one cycle behind the ADC With this sequence at the end of data conversions one additional external trigger is required to move the data from the ADC to the Memory buffer At the start of data conversion with the first external trigger signal given the Start Convert Bit is set data is not input to the Memory buffer since the data in the ADC buffer is old convert data SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE ADC Control Status Register Read Write Base 04H FUNCTION Scan Mode 000 Disable 001 Uniform Continuous 010 Uniform Single 011 Burst Continuous 100 Burst Single 101 Convert on External Trigger Only 110 Not Used 111 Not Used See the Modes of Operation section for a This read write register is used to select the output data format select the external trigger signal as an inp
21. Trigger input signal Bits 0 to 2 of the Counter Control Register are used to configure the channel for pulse width measurement An internal 1MHz 4MHz or 8MHz clock or an external clock up to 3 5MHz is used to set the pulse measurement resolution The polarity of the pulse is configured via input polarity bits 4 and 5 of the Counter Control Register For pulse width measurement the pulse width being measured serves as an enable control for an up counter whose value can be read from the Counter Readback Register When triggered the counter increments by one for each clock pulse while the input signal level remains in the active state high or low according to the programmed polarity The up counter may use an internal clock or an external clock at the counter s clock pin up to 3 5MHz The resultant pulse width is equivalent to the count value read from the Counter Readback Register multiplied by the clock rate An output pulse will be generated at the counter output pin to signal the completion of a given measurement Note that the measured pulse width may be in error by 1 clock cycle Reading a counter value of OxFFFFFFFF for a 32 bit counter indicates that the pulse duration is longer than the current counter size and clock frequency can measure Upon read of this overflow value you must select a slower counter clock frequency and re measure An interrupt can be generated upon completion of a given pulse width measurement the
22. a precision single size PMC module with the capability to monitor 16 differential or 32 single ended analog input channels to 16 bit resolution In addition eight 16 bit analog output voltage channels and 16 digital input output channels are provided Lastly one independent multifunction 32 bit counter timer is available The analog voltage input channels share a single 16 bit Analog to Digital Converter ADC The channel conversion rate is controlled by a user programmable delay counter All analog input channels share two generous 512 sample memory buffers from which digitized values are read Since all channels share the same memory buffer data tagging is implemented for easy identification of corresponding channel data To minimize CPU interaction an interrupt can be generated upon reaching a programmable memory full threshold condition The eight analog output voltage channels each have a dedicated register from which digital values are transferred to their corresponding Digital to Analog Converter DAC The eight analog output voltage channels share a 1024 sample First In First Out FIFO buffer Digital samples are moved from the FIFO to the individual DAC registers The digital values are then simultaneously converted to analog at the rate set by a user programmable delay counter Interrupt generation is provided for a FIFO almost empty condition to minimize CPU interaction The 16 digital input output channels can be programm
23. bit or 8 bit data transfers This register s contents are cleared upon reset Conversion Timer Register 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 This 16 bit number is the second divisor of an 8MHz clock signal and is used together with the Timer Prescaler Register to derive the frequency of periodic triggers for precisely timed intervals between conversions The interval time between conversion triggers is generated by cascading two counters The first counter the Timer Prescaler is clocked by an 8MHz clock signal The output of this clock is input to the second counter the Conversion Timer and the output is used to generate periodic trigger pulses The time period between trigger pulses is described by the following equation Timer Prescaler Conversion Timer 8 T in seconds Where T time period between trigger pulses in microseconds Timer Prescaler can be any value between 80 and 255 decimal Conversion Timer can be any value between 1 and 65 535 decimal The maximum period of time which can be programmed to occur between conversions is 255 65 535 8 2 0889 seconds The minimum time interval which can be programmed to occur is 80 1 8 10 seconds The 10u seconds maximum sample rate corresponds to a maximum sample frequency of 100KHz The maximum analog input frequency should be band limited to one half the sample frequency An anti aliasing filter should be added to remove unwant
24. conversions is most useful for its simplicity and for when precise time of conversion is not critical Typically software triggering is used for initiating the first conversion The DAC Control Conversion Timer and FIFO threshold register must first be configured before the Start Convert bit is set Data must also be present in FIFO memory before the Start Convert bit is set for conversion modes This register can be written via 32 bit 16 bit or 8 bit data transfer Data bit O must be a logic to initiate data conversions DAC FIFO Write Port Write Only Base DAC operations have a dedicated 1024 sample deep FIFO buffer The FIFO samples are 20 bit data values The least significant bits 15 to 0 represent the digitized data bits 18 to 16 represent the channel tag and bit 19 is the end of sample flag bit Writing to the FIFO is possible via 32 bit data transfers only A new set of digitized values are read from the FIFO and written to the DAC upon each new conversion cycle A new set of digitized values can be any number of samples from one up to all eight channels The sample flag bit is used to mark the end of a 19 set of new digitized values For example if only channels 1 and 3 are to be updated on the first conversion cycle and channels 1 3 and 7 are to be updated on the next conversion cycle then the FIFO will contain the data shown in the following table Notice the placement of the sample flag bi
25. data values available in the memory buffer before the rate of new input data acquisition causes the buffers to switch then the automatic disabling of analog input acquisition upon memory bank switching can be selected via this control register bit If this bit is set to 1 analog input will be disabled upon a memory bank switch Also bits 8 9 and 10 of this register will be set to 000 to reflect the disabled analog input mode 0 Enable Reset of Memory Write Pointer on issue of a software or external trigger 1 Disable reset of Memory Write Pointer on software or external trigger Transition Status Bit 0 Waiting for New Valid Data in Memory 1 Valid Data in Memory This transition status bit can be polled to insure the Memory buffer data is valid The transition status bit will be set when the memory buffer switches causing new valid data to be available in the read memory buffer The transition status bit is cleared upon the first read of the memory buffer and will not be set again until new valid data is available Notes Table 3 6 1 Not Used bit when set will read back as logic 1 SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE ADC Start Channel Value Register Read Write 08H The Start Channel Value register must be written to set the first channel that is to be converted once conversions have been triggered All channels from the start to the end channel value are converted A single channel can be
26. following a reset which means that if enabled the inputs will cause interrupts for the levels specified by the digital input channel Interrupt Polarity Register Channel read or write operations use 8 bit 16 bit or 32 bit data transfers Note that interrupts will not occur unless they are enabled The Interrupt Status register at the carrier s base address offset 42H is used to monitor pending interrupts corresponding to channels 0 through 15 For example channel 0 is monitored via data bit 0 Interrupt Polarity Registers Read Write Base 46H The Interrupt Polarity Register determines the level that will cause a channel interrupt to occur for each of the channels enabled for level interrupts A 0 bit specifies that an interrupt will occur when the corresponding input channel is low i e a in the digital input channel data register A 1 bit means that an interrupt will occur when the input channel is high i e a 1 in the digital input channel data register Note that no interrupts will occur unless they are enabled by the Interrupt Enable Register Further the Interrupt Polarity Register will have no effect if the Change of State COS interrupt type is configured by the Interrupt Type Configuration Register If debounce is enabled and an Interrupt Polarity bit is set low the corresponding active low signal will be debounced Likewise with debounce enabled and the Interrupt Polarity bit set high the
27. how to read the coefficients from memory Using equation 4 you can determine the corrected digital input For the previous example equation 3 returned a result 16 384 for the Ideal Digital Input to produce an output of 5 Volts Assuming that a gain error of 836 and an offset error of 200 are read from memory on the PMC730 for the desired channel substitution into equation 4 yields Gain Correct 830 1 3276 75 3279 4893 1 000 000 200 CorrectDigVal 5 10 x Gain Correct 16 395 4 100 If the hexadecimal value 400B rounded to 16 395 decimal is used to program the DAC output the output value will approach 5 Volts to within the calibrated error see the specification chapter for details regarding maximum calibrated error It is recommended that interrupts be enabled upon a FIFO threshold condition Upon this interrupt no more than 1024 samples minus the threshold value should be written to the FIFO A software or hardware reset will clear the FIFO contents 20 SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Digital Input Output Registers Read Write Base 38H Sixteen possible input output channels numbered 0 through 15 may be individually accessed via these registers The Input Output Digital register is used to monitor read or set write channels 0 through 15 Channels 7 to 0 are accessed at the carrier base address 38H via data bits 7 to 0 Channels 15
28. of the burst single mode of operation conversions are started either by an external trigger or by setting the software start convert bit If the external trigger is to be used bits 2 and 1 of the Control register must be set to 01 to accept the external trigger as an input signal Interrupts can be enabled to go active when the Memory buffer contains more samples than the set threshold value The interrupt condition will remain set until interrupts are disabled or ADC data is read from the Memory ADC Convert On External Trigger Only Mode In convert on External Trigger Only Mode of operation each conversion is initiated by an external trigger falling edge of a logic low pulse input to the PMC730 on the ADC Trigger In pin Digital Channel 0 of the field I O connector Conversions are performed for all channels enabled via the ADC Start End Channel Value registers in sequential order The interval between conversions is controlled by the period between external triggers The ADC Conversion Timer has no functionality in this mode of operation The external trigger signal must be configured as an input for this mode of operation The external trigger can be configured as an input by setting bits 2 and 1 of the Control register to 01 At least 10u seconds of data acquire time should be provided via software after programming the ADC Control register and ADC Start End Channel Value registers before the first external trigger is issued
29. pulse duration programmed into the counter constant registers Waveform generation may be triggered externally via the Trigger input or internally via the Trigger Control Register according to the state of the trigger source bit 7 in the Counter Control Register An initial trigger software or external causes the pulse width modulated signal to be generated with no additional triggers required If the Interrupt Enable bit of the Counter Control Register is set bit 8 and bit 0 of the Interrupt register is set an interrupt is generated when the pulse transitions from low to high and also when the pulse transitions from high to low Watchdog Timer Operation The watchdog operation will countdown from a programmed Counter Constant 1 value until it reaches 0 While counting the counter output will be in its active state the output polarity is programmable Upon time out the counter output will return to its inactive state and an optional interrupt may be generated A watchdog timer that has timed out will not re cycle until it is re triggered following a load of the Counter Constant 1 register Counter Control Register bit 11 0 The counter can also be re cycled by generating an input pulse 140ns minimum at the Counter Input pin Digital Channel 2 Note that auto loading must be inhibited via Counter Control Register bit 11 1 Failure to cause a reload would generate an automatic time out upon re triggering since the counter r
30. pulse has returned to the opposite polarity if enabled via the interrupt enable bit of the Counter Control Register bit 8 and bit 0 of the Interrupt register The interrupt will remain pending until released via bit 12 of the counter control register offset 50H Input Period Measurement The counter timer may be used to measure the period of an input signal at the Counter Input pin Digital Channel 2 Bits 0 to 2 of the Counter Control Register are used to configure the channel for periodic rate measurement Period measurement is accomplished the same way as described above for pulse width measurement except that the Counter Readback Register holds the period of the input signal in number of clock cycles not just the width of the high or low pulse Note that the measured period may be in error by 1 clock cycle Reading a counter value of OxFFFFFFFF for 32 bit counter indicates that the pulse duration is longer than the current counter size and clock frequency can measure Upon read of this overflow value you must select a slower counter clock frequency and re measure An interrupt can be generated upon completion of a given period measurement if enabled via the interrupt enable bit of the Counter Control Register bit 8 and bit 0 of the Interrupt register The interrupt will remain pending until released via bit 12 of the counter control register offset 50H One Shot Pulse Mode One Shot pulse mode provides an outpu
31. reset will clear all bits to zero 29 4 0 THEORY OF OPERATION This section contains information regarding the hardware of the PMC730 A description of the basic functionality of the circuitry used on the board is also provided Refer to the Block Diagram shown in Drawing 4501 910 as you review this material LOGIC POWER INTERFACE The logic interface to the carrier board is made through two 64 pin connectors refer to Tables 2 4 and 2 5 These connectors also provide 5V and 12V power to the module Note that the signals in bold italic are not used A Field Programmable Gate Array FPGA installed on the PMC Module provides an interface to the carrier CPU board per PMC Module draft specification P1386 1 and Local Bus Specification 2 2 The interface to the carrier CPU board allows complete control of all PMC730 functions PCI INTERFACE LOGIC The PMC730 is a target only module with the PCI bus interface logic imbedded within the FPGA This logic includes support for PCI commands including configuration read write and memory read write In addition the PCI target interface performs parity error detection uses a single 4K base address register and implements target abort retry and disconnect The PMC730 logic also implements interrupt requests via interrupt line INTA ADC CONVERSION CONTROL LOGIC All logic to control data conversions is imbedded in the PMC module s FPGA The control logic of the module is re
32. selected by writing the desired channel value in both the Start and End Channel Value registers The Start Channel Value register can be read or written with 8 bit data transfers In addition the Start Channel Value register can be simultaneously accessed with the End Channel Value via a 32 bit or 16 bit data transfer The unused bits are zero when read The register contents are cleared upon reset Start Channel Value Register Start Channel Value 07 06 05 04 os o2 Oi O0 After data conversions are halted the internal hardware pointers are reinitialized to the start channel value Thus when conversions are started again the first channel converted is defined by the Start Channel Value register ADC End Channel Value Register Read Write 09H The End Channel Value register must be written to indicate the last channel in a sequence to be converted When scanning all channels between and including the start and end channels are converted A single channel can be selected by writing the desired channel value in both the Start and End Channel Value registers The End Channel Value register can be read or written with 8 bit data transfers In addition the End Channel Value register can be simultaneously accessed with the Start Channel Value with a 32 bit or 16 bit data transfer The unused data bits are zero when read The register contents are cleared upon reset End Channel Value Register End Channel Value 1
33. to 8 are accessed at the carrier base address 38H via data bits 15 to 8 Channel read write operations use 8 bit 16 bit or 32 bit data transfers with the lower ordered bits corresponding to the lower numbered channels for the register of interest All input output channels are configured as inputs on a power on or software reset The unused upper 16 bits of this register are Not Used and will always read low 0 s Digital Direction Control Register Read Write Base 3CH The data direction input or output of the 16 digital channels is selected via bit O and bit 1 of this register The data direction of channels 0 to 7 are set controlled bit 0 while the data direction for bits 8 to 15 are controlled via bit 1 Setting a bit high configures the corresponding channel data direction for output Setting the control bit low configures the corresponding channel data direction for input The ADC and DAC trigger signals can be enabled to use Digital Port bits 0 and 1 as input and Digital bits 8 and 9 as output If a trigger signal is enabled for input at either the ADC or DAC control register the data Direction Control Register must also be set as input for channels 0 to 7 trigger signal is enabled for output at either the ADC or DAC control register the data Direction Control Register must also be set as output for channels 8 to 15 The default power up state of these registers is logic low Thus all channels are c
34. with additional values Alternatively a polling method could be used The FIFO empty full and Less Samples than set Threshold status flags are available on bits 13 and 14 respectively These bits can be polled and when set the FIFO can be reloaded with new data 17 DAC Recycle Same Data Conversions Mode Recycle Same Data Conversion Mode allows continuous recycling through FIFO memory In this mode a continuous recycling of the FIFO data starting with the first value written to the FIFO after a reset and ending at the last value written to the FIFO The output data is continuously recycled in an unending loop This mode is useful when it is necessary to generate periodic waveforms Writing data to the FIFO while this mode is active will cause erroneous operation The FIFO should be preloaded before this mode of operation is triggered This mode also utilizes the tag and end of sample flag Each sample must have a tag to identify the corresponding channel to be updated The tag value is a 3 bit value present on bits 18 to 16 Samples are read from the FIFO and moved to the channel corresponding to their tag until an end of sample flag is detected The end of sample flag bit 19 makes it possible to update only one channel or up to all channels for each output conversion cycle Those channels not updated by the FIFO in a new cycle will maintain and output the last sample read DAC conversions are implemented at the rate specified b
35. 113 73 LSB 7 LSB 0 0209 0 01 8 91 LSB 5 LSB 0 0135 0 007 Max Err LSB Span 15 39 LSB 0 0235 10 to 10 9 Follow the input connection recommendations of Section 2 because input noise and non ideal grounds can degrade overall system accuracy Accuracy versus temperature depends on the temperature coefficient of the calibration voltage 10 Reference Test Conditions Temperature 25 C Differential inputs channels 0 to 15 100K conversions second 512 input samples averaged 512 autozero values averaged and 512 calibration voltages averaged with a 2 meter shielded cable length connection to the field analog input signals 11 For critical applications multiple input samples should be averaged to improve performance 3 LSB rms Typical 10V input range Input Note 12 Temperature 25 C Differential inputs channels 0 to 15 100K conversions second A total of 2048 input samples were taken statistically assuming a normal distribution to determine the RMS value ADC External Trigger Input Output Must be an active low 5 volt logic TTL compatible signal referenced to digital common Conversions are triggered on the active low state of this trigger signal Minimum pulse width 250nano seconds Conversions are triggered 250nano to 375nano seconds after the external trigger signal goes active for External Trigger Only scan mode For all other scan mo
36. 4 4 34 ANALOG INPUT 34 ANALOG OUTPUT 36 DIGITAL 36 COUNTER 37 PCI Local Bus 37 APPENDIX 38 CABLE SCSI 2 to Round Shielded 38 MODEL 5033 636 1 TERMINATION PANEL MODEL 5033 646 38 DRAWINGS Page 4501 844 MECHANICAL ASSEMBLY 39 4501 911 PMC730 SWITCH LOCATION 40 4501 913 ANALOG INPUT CONNECTION 41 4501 910 PMC730 BLOCK DIAGRAM 42 4501 919 CABLE 5028 432 SHIELDED 43 4501 920 TERMINATION PANEL 5025 288 44 IMPORTANT SAFETY CONSIDERATIONS It is very important for the user to consider the possible adverse effects of power wiring component sensor or software failures in designing any type of control or monitoring system This is especially important where economic property loss or human life is involved It is important that the user employ satisfactory overall system design It is agreed between the Buyer and Acromag that this is the Buyer s responsibility Trademarks are the property of their respective owners SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE 1 0 GENERAL INFORMATION The PCI Mezzanine Card PMC Series PMC730 module is
37. 4 gt 8 8 LOLOSTHNNYHO NI Snalod 29091 LOL TANNVHO TOYLNOD gt gt ova 7 31907 JOULNOO JOSLNOS lt oav 4 MC viva UR ISNI 1 HOLMS NOLLO3 8S S35V L10A NOISIO3 lt NOIVHEI VO OVI VOdi 3OVJH3IN On LNdLNO YALNNOO LNdLNO LNAd NI LNdLNO DO IVNV 42 MULTIFUNCTION MODULE SERIES PMC730 PCI MEZZANINE CARD 9616 1057 SE a 89 Nid vE Nid 5 ATGWASSV 318VO Nid 89 ISOS 8204 13GdON LNOYS N D S 100060000000000000000000000000000 89 Nid ve U 5 dOL SIHONI 0 0 07 SIHONI 22 82 SualdN 2 gt OILVIN3HOS
38. 5 14 a S 12 11 10 09 o ADC Prescaler Register Read Write OCH The ADC Prescaler and Conversion Timer registers control the interval time between conversions This 8 bit register controls the interval time between conversions of all enabled channels along with the Conversion Timer Timer Prescaler Register LSB 07 06 o5 o4 o3 o2 Oi O0 This 8 bit number divides an 8 MHz clock signal The clock signal is further divided by the number held in the Conversion Timer Register The resulting frequency can be used to generate periodic triggers for precisely timed intervals between conversions The Timer Prescaler has a minimum allowed value restriction of 50 hex or 80 decimal A Timer Prescaler value of less then 80 decimal will result in erroneous operation This minimum value corresponds to a conversion interval of 10u 14 seconds which translates to the maximum conversion rate of 100KHz The formula used to calculate and determine the desired Timer Prescaler value is given in the Conversion Timer section which immediately follows Reading or writing to this register is possible via 32 bit 16 bit or 8 bit data transfers The Timer Prescaler register contents are cleared upon reset ADC Conversion Timer Register Read Write OEH The Conversion Timer Register can be written to control the interval time between conversions Reading or writing to this register is possible with either 32 bit 16
39. 9381534 SONILLAS HOLIMS NOILO313S 39NVM 90 1VNV 006v L lt 9986 SYSLSWITIN S3HONI SNOISNANIG M3IA 3015 LN3NOdNOO 91907 LON HOLIMS a 32 3 31 i 6 9 lt lt SNOILISOd Lf m SONILI3S HOLIMS 11nv43Q 0 1 m LMS NMOHS HOLIMS did 91914 98 167 E 90 LINA M NI HOLIMS NOILISOd di NI HOLIMS JOVIAYSLNI 0 1 td 1 1 MULTIFUNCTION MODULE SERIES PMC730 PCI MEZZANINE CARD 6 057 lt lt NONWNOO ASION 153 01 15349339 JHL 3A 3IHOV OL Q3QN3 319 5 0 Q30QN3WWOO33 SNOLLO3NNOO LNdNI 39VLTOA 383334140 NOWNOD OL Q3193NNOO 38 SNONWOO AlddNS AHL GAGNANWOO3Y SI ONINAdWNL GASN 38 534405 TVNN3IX3 54001 GNNOYS GIOAV OL OL Q3193NNOO 38 LON LSNW 39N3N343H GNNOYS V ONIAVH AQV3Y1V STANNVHO ONILVO14 38 SSIMYSHLO GINOM A3HL NONWOO SOWWNY OL ST3NNVHO 393433354 72 54001 ANNOYS LNOHLIM ONIGTSIHS 3GIAOYd OL AINO ANI 3NO LV 39N333433 GNNOYD OL Q3193NNOO SI 913 ASION 153 01 303 Q30N3WWOO33 SI 371895 GACTSIHS SALON 310 335 1 219 1 Alddns Y3MOd 1Y NOLLO3NNOO ANNOYS 15 A
40. Acromag 4 Series PMC730 PCI Mezzanine Multifunction Module USER S MANUAL ACROMAG INCORPORATED 30765 South Wixom Road P O BOX 437 Wixom MI 48393 7037 U S A Tel 248 624 1541 Fax 248 624 9234 Copyright 2002 Acromag Inc Printed in the USA Data and specifications are subject to change without notice 8500 680 D10A004 SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE The information contained in this manual is subject to change without notice Acromag Inc makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Further Acromag Inc assumes no responsibility for any errors that may appear in this manual and makes no commitment to update or keep current the information contained in this manual No part of this manual may be copied or reproduced in any form without the prior written consent of Acromag Inc Table of Contents 1 0 GENERAL KEY PMC730 ADC FEATURES KEY PMC730 DAC 5 KEY PMC730 COUNTER TIMER FEATURES KEY PMC730 DIGITAL INPUT OUTPUT FEATURES PCI MEZZANINE CARD INTERFACE FEATURES SIGNAL INTERFACE PMC MODULE ActiveX CONTROL SOFTWARE MODULE VxWORKS SOFTWARE
41. Bit 0 of the Calibration Read Data Status register is the read complete status bit This bit will be set high to indicate that the requested calibration value is available on data bits 15 to 8 of the Calibration Read Data Status register This bit is cleared upon initiation of a new read access of the memory or upon issue of a hardware reset SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Reference Voltage Read Data Status Register Read Data Read Complete Not Used Write Busy 15 Downto8 7Downto2 1 o Writes to Calibration memory require a special enable code and are normally only performed at the factory The module should be returned to Acromag if the reference voltages must be re measured and stored to memory A write operation to the memory initiated via the Calibration Access register will take approximately 5 milliseconds Bit 1 of the Calibration Read Data Status register serves as a write operation busy status indicator Bit 1 will be set high upon initiation of a write operation and will remain high until the requested write operation has completed New read or write accesses to the memory via the Calibration Access register should not be initiated unless the write busy status bit 1 is clear set low to 0 A hardware reset of the module will also clear this bit Read accesses to the Calibration Read Data Status register are possible via 32 bit or 16 bit data transfers only A software or hardware
42. C module Acromag provides a software product sold separately consisting of PMC module VxWorks drivers This software Model PMCSW API VXW MSDOS format is composed of VxWorks real time operating system libraries for all Acromag PMC modules The software is implemented as a library of C functions which link with existing user code to make possible simple control of all Acromag PMC modules Acromag provides a software product sold separately consisting of PMC module drivers This software Model PCISW API QNX MSDOS format is composed of real time operating system libraries for all Acromag PMC modules The software is implemented as a library of C functions which link with existing user code to make possible simple control of all Acromag PMC modules SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE 5 0 SERVICE AND REPAIR SERVICE AND REPAIR ASSISTANCE Annual return of the PMC730 to Acromag for recalibration of the reference calibration voltages is highly recommended Corrected data accuracies depend heavily on the calibration voltages being within specification Contact Acromag for technical details and procedures which can be followed to periodically recalibrate the reference voltages Surface Mounted Technology SMT boards are generally difficult to repair It is highly recommended that a non functioning board be returned to Acromag for repair The board can be easily damaged unless sp
43. C Memory Threshold register Burst Read of PMC730 ADC Memory Burst read of the PMC730 memory buffer will allow a 40Mbyte per second data read rate With every three PCI clock cycles a new data sample is read from the memory buffer The SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE PMC730 will automatically stop the burst operation upon reaching the end of the ADC Memory buffer ADC External Trigger The external trigger connections are made via the ADC Trigger In pin Digital Channel 0 of the Field Connector For all modes of operation when the external trigger is enabled as an input via bits 1 and 2 of the control register the falling edge of the external trigger will initiate conversions Once the external trigger signal has been driven low it should remain low for a minimum of 250n seconds for proper external trigger operation The external trigger input signals must be TTL compatible As an output an active low TTL signal is driven from the PMC module The trigger pulse generated is low for 500n seconds typical The external trigger connections are made via the ADC Trigger Out pin Digital Channel 8 of the Field Connector For all modes of operation the external trigger is enabled as an output via bits 1 and 2 of the control register See section 3 0 for programming details to make use of this signal ADC Interrupt Control Logic The PMC730 can be configured to generate an interrupt using a progra
44. CI MEZZANINE CARD MULTIFUNCTION MODULE Uncalibrated ADC Performance The uncalibrated ADC performance is affected by two primary error sources These are the instrumentation amplifier and the Analog to Digital Converter ADC The untrimmed instrumentation amplifier and ADC have offset and gain errors see specifications in chapter 6 which reveal the need for software calibration Calibrated ADC Performance Very accurate calibration of the ADC digitized values can be accomplished by using calibration reference voltages present on the board The four voltages and the analog ground reference are used to determine two points of a straight line which defines the analog input characteristic The exact value of the four reference voltages are stored in on board memory to provide the most accurate calibration See Table 3 14 and the Calibration Access Register section for details regarding read of calibration coefficients The calibration voltages are used with the auto zero signal to find two points that determine the straight line characteristic of the analog front end for a particular range The recommended calibration voltage selection for each range is summarized in Table 3 7 Equation 1 following is used to correct the actual ADC data i e the uncorrected bit count read from the ADC making use of the calibration voltages and range constants Corrected_Count 65536 m Ideal Volt Span Volt Ideal Zero CALLO icon Aci
45. For pulse width modulation this register holds the width of the first half of the pulse The width is defined by this constant value multiplied by period of the clock signal selected via control register bits 9 amp 10 Writing the Counter Constant 1 value loads the counter with the written value Once triggered the counter will count down until a terminal count 0 is reached At this time Counter Constant 2 is loaded into the counter For watchdog timers this register stores the initial count value from which the timer starts counting Note that in any counter mode except when Counter Control Register bit 11 is set when you write to the Counter Constant Register the internal counter register will be written with the same value at the same time Setting bit 11 of the Counter Control Register to 1 will instead cause the timer counter to be loaded from the Counter Constant Register only after an external input pulse occurs 140ns minimum pulse width for watchdog mode Note that since this register is write only the counter constant value cannot be read back However the value loaded into this dog register can be read back indirectly from the Counter Readback Register prior to initially counting Note that the Counter Constant Registers are cleared set to 0 following a system or software reset Counter Constant 2 Register Write Only Base 5CH This write only register is used to store the counter timer constant 2 value
46. In pin Digital Channel 3 with a 250ns minimum Trigger pulse required Interrupt Enable 0 Disable Interrupt Service Default 00 Internal 1MHz Default 11 External Clock Up to 3 4MHz Digital Channel 4 Register Load Selection Load via write to Counter Constant EN 1 Externally Triggered Load of 10 9 Counter via pulse at Counter Input pin Digital Channel 2 Bits 4 and 5 of this register must be enabled when using external load Interrupt Pending Interrupt Release Bit Read of this bit reflects the interrupt pending status of the counter timer logic 0 Interrupt Not Pending 1 Interrupt Pending Write a logic 1 to this bit to release a counter timer pending interrupt A counter timer pending interrupt can also be released by disabling interrupts via bit 8 of this register 26 14 13 Gate Off Source If enabled the Gate Off signal must be input on the Counter Gate off pin Digital Channel 5 Gate Off when active causes event counter to count down and the watchdog counter to stop 00 Disabled Gate Off notused Output Available on Pin as driven by MOSFET Output Available on Pin as driven by MOSFET Output is also available on Counter Output pin Digital Channel 10 Digital I O Direction register for channels 8 to 15 must also be selected for output Notes Counter Control Register 1 The default state of the output is high output has pullup
47. ODULE COUNTER TIMER MODES OF OPERATION The 32 bit counter timer function of the PMC730 provides six modes of operation pulse width modulation watchdog timer event counting pulse width measurement period measurement and one shot pulse mode The following sections describe the features of each method of operation and how to best use them Pulse Width Modulation Pulse width modulated waveforms may be generated at the counter timer output field connector pin 1 Waveforms are generated continuously Waveform generation is configured via the Counter Control Register The time until the pulse is generated is controlled via the Counter Constant 1 register The duration of the pulse high or low is set via the Counter Constant 2 register Note that a high pulse will be generated if active high output is selected while a low pulse will be generated if active low output is selected The counter goes through a full countdown sequence for each Counter Constant value When the 0 count is detected on the next rising edge of the clock the output toggles to the opposite state and the second Counter Constant value is loaded into the counter and countdown resumes decrementing by one each clock cycle For example a counter constant value of 3 will provide a pulse duration of 4 clock cycles since the counter will count down from 3 to 0 Due to the rise fall time delay of the output mosfet driver a fixed delay of 1 to 2us will be added to the
48. ONd ONY 31000 Od N33ML38 LHOISH 9NDIOVIS 83H139501 Q3NSITv 39NO NdO YTINYVO ANY JINGOW NO SYOLOANNOD GYVOE nd9 33ldsvo 9d FHL JO T3Nvd 1NO34 NI 13238 OLNI 3015 30193NNOO 14 INGON OWd 133S ANY Z S310N 33S ZETO ALON 34003908d ATEWASSV 0193 AI8N3SSV IVOINVHO3AN GYVOd ndO s3lsNvo OL FINGOW TaNvd O4 NI NOO Ld JINGOW Od Vani SYOLDANNOOD FINGOW Nd ES Eg 4 40 3015 1N3NOdAO2 ancon 3015 1N3NOdNOO ALON 33S 5 13 Vd 1NOJ4 NI 239 OWS 39 MULTIFUNCTION MODULE SERIES PMC730 PCI MEZZANINE CARD LL6E LOGY SNOILVOO HOLIMS 6 L o v c g g Mv10dl S 010 6 8 9 c z ei 01 010 7 lt lt 1 59 7 uv 1Od 99 eet 016 69 lt 7 yv10d 0 01 OL OL 8795 6991 yv10d el 5 OL S m 5110 NI NMOHS SY 3ONVY NvdS LAANI 2Qv 814 OL 81 9NILL3S HOLIMS ees Sara 1ndNI did 110339 5 SI HOLIMS HOLIMS 93511035
49. PREPARATION FOR UNPACKING AND INSPECTION CARD CAGE CONSIDERATIONS BOARD Default Hardware Jumper DIP Switch Configuration Analog Input Range Hardware Configuration CONNECTORS wes ueris sete dee ru Front Panel Field Connector Rear J4 Field Connector pA Non Isolation PMC Local Bus Connector PROGRAMMING INFORMATION PCI Configuration Address Space Configuration Registers Page 2 0 3 0 XO CO CO 19699 I I I AON Interrupt 10 Analog Input amp Corresponding Digital Codes 11 ADC MODES OF 11 ADC Uniform Continuous Mode 11 ADC Uniform Single Mode 11 ADC Burst Continuous 11 ADC Burst Single 12 ADC Convert On External Trigger Only Mode 12 ADC Control Status Register p 13 ADC Start Channel Value Register 14 ADC End Channel Value Register 14 ADC Prescaler e 14 ADC Conversion Timer Register 14 ADC Memory Threshold Register
50. RIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Table 3 2 PMC730 Memory Map Base D15 Base Addr 000 Addr 03 Not Used Interrupt Register 00 Not Used ADC Control Status Register ADC Start and End Channel Values ADC Conversion Not Prescaler Timer Used Not Used ADC Memory Threshold Register ADC Start Convert Bit 0 Not Used Not Used Bits 31 to 01 Not Used Not Used DAC Control Status Register Not DAC Conversion Timer Used Not Used Not Used DAC FIFO Interrupt Threshold Not Used DAC Start Bits 31 to 01 Convert Bit 0 DAC FIFO Write Port Not Used 31 20 Flag bit 19 Tag bits 18 16 Data 15 0 Not Used 16 bit Digital I O Register Digital I O Direction Control Register Digital Interrupt Enable Register Digital Interrupt Digital Interrupt Polarity Register Type Register Debounce Duration Select and Enable Register Channels 0 to 7 Debounce Duration Select and Enable Register Channels 8 to 15 Counter Control Register Counter Read Back Register Not Used Digital Interrupt Status Register Counter Constant 1 Register Counter Constant 2 Register Not Used Bits 31 to 1 Counter Trigger Bit 0 Calibration Access Register Calibration Read Data amp Status Calibration Write Enable Code Not Used 1 Memory Location Not Used Not U
51. TL levels Buffer input channels include hysteresis for increased noise immunity Programmable Change of State Level Interupts Interrupts are software programmable for any bit Change Of State or level on all 16 channels Power Up and System Reset is Failsafe For safety the digital channels are configured for input upon power up PC MEZZANINE CARD INTERFACE FEATURES High density Single width PMC Target module Field Connections All analog input trigger and power connections are made through a single 68 pin SCSI 2 front panel I O connector for models PMC730 and PMC730E Models PMC730R and PMC730CC use 64 pin rear I O connector 32 16 8 bit I O Register Read Write is performed through data transfer cycles in the PCI memory space All registers can be assessed via 32 16 or 8 bit data transfers Compatibility IEEE P1386 1 compliant PMC module which complies to PCI Local Bus Specification Revision 2 2 Provides one multifunction interrupt 5V signaling compliant and 3 3V signaling tolerant SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE SIGNAL INTERFACE PRODUCTS This PMC Module will mate directly to standard PMC carrier boards that support single width PMC mezzanine modules Once connected front modules are accessed via a 68 pin front panel connector The cable and termination panel described in the following paragraphs are also available For optimum performance with
52. active high signal is debounced The Interrupt Polarity register at the carrier s base address offset 46H is used to control channels 0 through 15 For example channel 0 is controlled via data bit 16 SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Table 3 11 Debounce Duration Select All bits are set to 0 following a reset which means that the inputs will cause interrupts when they are below TTL threshold 00 Bebounce Disabled provided they are enabled for interrupt on level Debounce Duration Select and Enable Register Read Write Base 48H and 4CH This register controls debounce enable and duration selection for each of the 16 digital channels The long word at base 48hex controls debounce for the digital I O signals 0 to 7 The All bits are set to 0 following a reset Thus on reset and long word at base 4C hex controls debounce for the digital I O power up debounce will be disabled by default These registers signals 8 to 15 are read write registers that can be accessed with 8 bit 16 bit or 32 bit data transfers Table 3 10A Debounce Duration Select and Enable Register Base 48H Table 3 10B Debounce Duration Select and Enable Register Base 4CH Notes Table 3 10 1 Not Used bit when set will read back as logic 1 2 These bits must be set as shown in the Debounce Duration Select Table 3 11 22 SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION M
53. al bus connector are standard for all PMC modules according to the PCI Mezzanine Card Specification see Tables 2 4 and 2 5 Table 2 4 PMC Connector Pin Assignments for J1 32 bit PCI Signal Name Pins SignalName Pin 5 mT 6 BUSMODE1 7 5v 8 9 PckBSVD 10 17 AD 22 27 AD 59 DON 60 Indicates that the signal is active low BOLD ITALIC Signals are NOT USED by this PMC Model SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Table 2 5 PMC Connector Pin Assignments for J2 32 bit PCI Signal Name Pin SignalName Pins 3 TMS 7 PcHSvx 8 9 PCLRSVD 10 se PcHsvb 60 Indicates that the signal is active low BOLD ITALIC Signals are NOT USED by this PMC Model SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE 3 0 PROGRAMMING INFORMATION This Section provides the specific information necessary to program and operate the PMC730 module This Acromag PMC730 is a PCI Specification version 2 2 compliant PCI bus target only PMC module The carrier CPU connects a PCI host bus to the PMC module The PCI bus is defined to address three distinct address spaces I O memory and configuration space This PMC module can be accessed via the PCI bus memory space and configuration spaces only The card s configuration registers are initialized by syste
54. alerting the host that a watchdog timer time out has occurred and may need to be reinitialized The interrupt will remain pending until the watchdog timer is reinitialized and the interrupt is released by setting bit 12 of the counter control register offset 50H Event Counting Operation Positive or negative polarity events may be tallied as selected via the input polarity bit of the Counter Control Register bits 4 and 5 In this mode input pulses or events occurring at the input pin of the counter may be counted up to a programmed count limit Upon reaching the count limit the counter output will generate an output pulse an optional interrupt can be generated and the internal event counter register is then cleared Alternatively events occurring at the input pin can be selected to count down with use of the Gate Off signal present on Counter Gate off pin Digital Channel 5 When the Gate Off signal is active the counter is in the count down mode when inactive the counter counts up The Counter Constant 1 Register holds the count to value constant Reading the Counter Readback Register will return the current count variable In event counter mode the input event serves as an enable to count an event A minimum event pulse width of 140ns is required for correct pulse detection with input debounce disabled With debounce enabled a minimum event pulse width is defined by that selected via the Debounce Duration Select and Enable r
55. and Empty conditions Field Analog Output The field I O interface to the board is provided through the front connector refer to Table 2 1 Field I O signals are NON 31 ISOLATED This means that the field return and logic common have a direct electrical connection to each other As such care must be taken to avoid ground loops Ignoring ground loops may cause operation errors and with extreme abuse possible circuit damage The output range for the DACs is fixed at 10 to 10 volts as detailed in chapter 2 Data Transfer FPGA To DACs A serial shift register is implemented in the module s FPGA for each of the supported channels Internal FPGA counters are used to synchronize the transfer of FIFO data to the corresponding serial shift register for output to its converter Channels 0 to 3 are output to one DAC while channels 4 to 7 are output to the other DAC DAC Conversion Timer The DAC update interval may be controlled by the conversion timer which is a 24 bit counter implemented in the FPGA The conversion counter is clocked by an 8MHz clock signal Periods from 12 375 seconds to 2 0889 seconds can be programmed The output of this conversion counter is used to trigger the start of new conversions Triggers generated by the conversion counter are also referenced as hardware timer generated triggers in chapter 3 of this manual The conversion counter is used to synchronize the transfer of DAC FIFO data to the DAC IC
56. based upon selection of single ended or differential analog input and the Start and End channel register values Single ended and differential channels cannot be mixed they must all be single ended or differentially wired Up to 32 single ended inputs can be monitored where each channel s input is individually selected along with a single sense lead for all channels Up to 16 differential inputs can be monitored where each channel s and inputs are individually selected The output of the multiplexer stage feeds an instrumentation amplifier INAMP stage The INAMP has a fixed gain of one The INAMPs high input impedance allows measurement of analog input signals without loading the source The INAMP takes in the channel s and inputs and outputs a single ended voltage proportional to it The output of the INAMP feeds the ADC The ADC is a state of the art 16 bit successive approximation converter with a built in sample and hold circuit The sample and hold circuit goes into the hold mode when a conversion is initiated This maintains the selected channel s voltage constant until the ADC has accurately digitized the input Then it returns to sample mode to acquire the next analog input signal Once a conversion has been completed control logic on the module automatically reads the digitized value corresponding to the previous converted channel This allows the input to settle for the next channel while the previous
57. be forced to be output If External Trigger input or output is not required the External Trigger should be configured as Disabled 13 Read Write Bit Acquisition Input Mode 000 All Channels Differential Input 001 All Channels Single Ended Input 010 Not Used 011 9 88v Calibration Voltage Input 100 4 94v Calibration Voltage Input 101 2 47v Calibration Voltage Input 110 1 23v Calibration Voltage Input 111 Auto Zero Calibration Voltage Input 15 Read Only Bit Timer Enable 0 Disable Only in External Trigger Only or Burst modes 1 Enable Continuous and Burst modes Not Used 13 0 Disable Interrupt 1 Enable Interrupt If enabled via this bit an interrupt request from the module will be issued to the system if the Memory contains more than the threshold number of bytes selected via the threshold register The interrupt request will remain active until released via a read of the Analog Data Memory buffer or by disabling interrupts via this bit Interrupt Pending Interrupt Release Bit Read of this bit reflects the interrupt pending status of the ADC logic 0 Interrupt Not Pending 1 Interrupt Pending Write a logic 1 to this bit to release an ADC pending interrupt A pending interrupt can also be released by disabling interrupts via bit 11 of this register 0 Enable Continued Analog Input 1 Disable Conversions on Memory Bank Switch If the system cannot read all valid
58. channel is converting This pipelined mode of operation facilitates maximum system throughput A miniature DIP switch on the board controls the range selection for the ADC 3 3 to 3 3 5 to 5 10 to 10 0 to 5 and 0 to 10 Volts as detailed in section 2 DIP switch selection should be made prior to powering the unit Thus all channels will use the same selected ADC range The board contains four precision voltage references and a ground autozero reference for use in calibration These provide considerable flexibility in obtaining accurate calibration for the desired ADC range and gain combination when compared to fixed hardware potentiometers for offset and gain calibration of the ADC and INAMP Data Transfer ADC to FPGA A wait of 10u seconds is implemented after a software or external start convert signal is generated This time ensures the channel multiplexers are set as required for conversion of the first selected channel This wait of 10u seconds is not implemented in the External Trigger Only mode of operation Serially shifting the 16 bits of digitized data to the FPGA and then writing to the Memory buffer is completed 8 seconds after ADC convert signal goes active A 16 bit serial shift register is implemented in the FPGA This serial shift register interfaces to the ADC A clock signal provided by the converter is used to serially shift the new data from the converter to the FPGA s 16 bit serial shift register Use
59. code 01 Then issuing a software start convert or external trigger will initiate the update of the DAC channels The DAC Conversion Timer register is not used in this mode of operation DAC Continuous New Data Conversion Mode In the Continuous New Data Conversion mode of operation the hardware controls the continuous shifting of digital data from the FIFO buffer to the DAC channels Each sample must have a tag to identify the corresponding channel to be updated The tag value is a 3 bit value present on bits 18 to 16 Samples are read from the FIFO and moved to the channel corresponding to their tag until an end of sample flag is detected The end of sample flag bit 19 makes it possible to update only one channel or up to all channels for each output conversion cycle Those channels not updated in the given cycle will use their last valid sample in the new conversion cycle Digital data is output to the converter at the rate specified by the DAC Conversion Timer This mode of operation is ideal for aperiodic waveform generation To select this mode of operation bits 1 and 0 of the DAC Channel Control register must be set to digital code 10 Then issuing a software start convert or external trigger will initiate the continuous update of the DAC channels The interrupt capability of the PMC730 can be employed as a means to indicate to the system that the 1024 sample FIFO has fewer samples than the set threshold and must be loaded
60. d cable 68 wires SCSI 3 male connector at both ends The cable length is 2 meters 6 56 feet This shielded cable is recommended for all I O applications both digital I O and precision analog Application Used to connect Model 5025 288 termination panel to the PMC730 Module Length Standard length is 2 meters 6 56 feet Consult factory for other lengths It is recommended that this length be kept to a minimum to reduce noise and power loss Cable 68 conductors 28 AWG on 0 050 inch centers permits mass termination for IDC connectors foil braided shield inside a PVC jacket Connectors SCSI 3 68 pin male connector with backshell Keying The SCSI 3 connector has a D Shell Schematic and Physical Attributes See Drawing 4501 919 Electrical Specifications 30 VAC per UL and CSA SCSI 3 connector spec s 1 Amp maximum at 50 energized SCSI 3 connector spec s Operating Temperature 30 C to 80 Storage Temperature 40 to 85 Shipping Weight 1 0 pound 0 5Kg packed TERMINATION PANEL MODEL 5025 288 Type Termination Panel For PMC Module Boards Application To connect field I O signals to the PMC Module Termination Panel Acromag Part 4001 066 The 5025 288 termination panel facilitates the connection of up to 68 field signals and connects to the PMC Module connectors only via a round shielded cable Model 5028 432 Field signals are accessed via screw terminal strips The terminal st
61. des the first conversion is triggered 10u seconds after the external trigger or software trigger goes active SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE As An Active low 5 volt logic TTL compatible output is generated The trigger pulse is low for typically 500nano seconds ANALOG OUTPUTS Output Channels Eight Single Ended Channels FIFO 1024 samples buffer shared for all channels Output Signal Voltage Non isolated Output Bipolar 10 to 10 Volts Note 13 The actual outputs may fall short of the range endpoints due to hardware offset and gain errors The software calibration corrects for these across the output range but cannot extend the output beyond that achievable with the hardware The accuracy of the voltage output depends on the amount of current loading impedance of the load and the length impedance of the cabling High impedance loads e g loads gt 100KQ provide the best accuracy For low impedance loads the effects of source and cabling resistance should be considered Output Current 10mA to 10mA Maximum this corresponds to a minimum load resistance of 1KQ with a 10V output DAC Data Format Straight Binary Resolution 16 bits Monotonicity over
62. digital signals as inputs can be used to control the operation of the 32 bit Counter Timer provided in this module These signals can also be used for external trigger input or output for the ADC and DAC logic Channel Configuration Input Signal Hysteresis Input Debounce SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE 32 Bit Counter Counter Functions Pulse Width Modulation Watch Dog Event Counting Pulse Measurement Period Measurement or One Shot 8MHz 4MHz 1 2 or External up to 3 4MHz Counter Clock Frequencies Counter Output IPS024G International Rectifier Continuous Drain to Source 35 Volts maximum recommended Continuous Drain Current 1 maximum Rise 0 9us typical Fall Time niece 1 3us typical Note 18 The Counter Output on pin 1 is programmable as active high or low This output is the open drain of an N channel mosfet with a common source connection The drain 4 7K pull up to 5 volts is the default configuration Removal of jumper J4 will require the use of an external voltage 35 volts maximum and external pull up resistor Board Crystal Oscillator Clock 16MHz Frequency Stability 100ppm This is 6 25ps for each clock cycle For examp
63. e range Differential inputs are the best choice when the input channels are sourced from different locations having slightly different ground references and when minimizing noise and maximizing accuracy are key concerns See Drawing 4501 913 for analog input connections for differential ended inputs Shielded cable of the shortest length possible is also strongly recommended 10uS Maximum 100KHz Maximum A D Conversion Conversion Rate Analog Input Memory Buffer 512 Sample Memory Input Signal Type Voltage Non isolated Input Overvoltage Protection 55 to 40 Volts Power Off SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE ADC Spec s Analog Devices AD977AR or Brown ADS7809U A D Resolution 16 bits Data Binary 2 s Complement and Straight Binary No Missing No Missing Codes 15 bits ADC A D Integral Linearity Error 3 LSB Maximum ADC Unipolar Zero Error 10mV Maximum for Unipolar Ranges Bipolar Offset 10mV Maximum for Bipolar Ranges Full Scale Error 0 5 Maximum Input 180 Typical Instrumentation Amplifier 128
64. ea MAE Counter Trig In Dig CH4 7 Analog In 511 011 Dig CH5 Analog In 527 011 7 eo PEE Digital 6 9 Analog In 10 010 44 Trig Out Dig CH9 12 Analog In S25 D9 DAC Trig Out Counter Output 60 Rear panel connector pin assignments are shown in Table 2 3 When reading Table 2 3 note that channel designations are abbreviated to save space Non Isolation Considerations The PMC730 is non isolated since there is electrical continuity between the logic and field grounds As such the field connections not isolated from the carrier CPU board and backplane Care should be taken in designing installations without isolation to avoid noise pickup and ground loops caused by multiple ground connections This is particularly important for analog inputs and outputs when a high level of accuracy resolution is needed PMC Local Bus Connector The PMC730 module provides a 32 bit PCI interface to the carrier CPU via two 64 pin connectors These connectors are 64 pin female receptacle header AMP 120527 1 or equivalent which mates to the male connector of the carrier CPU board AMP 120521 1 or equivalent This provides excellent connection integrity and utilizes gold plating in the mating area Threaded metric screws and spacers are supplied with the PMC module to provide additional stability for harsh environments see Drawing 4501 844 for assembly details The pin assignments of PCI loc
65. ecial SMT repair and service tools are used Further Acromag has automated test equipment that thoroughly checks the performance of each board When a board is first produced and when any repair is made it is tested placed ina burn in room at elevated temperature and retested before shipment Please refer to Acromag s Service Policy Bulletin or contact Acromag for complete details on how to obtain parts and repair PRELIMINARY SERVICE PROCEDURE Before beginning repair be sure that all of the procedures in Section 2 Preparation For Use have been followed Also refer to the documentation of your carrier CPU board to verify that it is correctly configured Replacement of the module with one that is known to work correctly is a good technique to isolate a faulty module CAUTION POWER MUST BE TURNED OFF BEFORE REMOVING OR INSERTING BOARDS Acromag s Applications Engineers can provide further technical assistance if required When needed complete repair services are also available from Acromag 33 SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE 6 0 SPECIFICATIONS PHYSICAL Physical Configuration Single PMC Module Height 13 5 mm 0 531 in Stacking Height 10 0 mm 0 394 in Depth 149 0 mm 5 866 in Width 74 0 mm 2 913 in 1 59 mm 0 062 in Connectors PCI Local Bus Interface Two 64 pin female receptacle header AMP 120527 1 or equival
66. ed as input or output on a byte basis All input channels can be enabled for change of state low or high level transition interrupts One independent 32 bit multifunction counter timer is also provided The counter can be configured for pulse width modulated output one shot pulse output event counter pulse width measurement period measurement or watchdog timer The PMC730 utilizes state of the art Surface Mounted Technology SMT to achieve its wide functionality and is an ideal choice for a wide range of industrial and scientific applications that require high performance analog input and output The PMC730 is available in both front and rear I O models Except where indicated otherwise all information presented in this manual is applicable all PMC730 models All models are available in standard and extended temperature ranges as follows MODEL FIELD OPERATING CONNECTOR TEMPERATURE RANGE PMC730 Front I O 0 to 70 C PMC730R Rear I O 0 to 70 C PMC730E Front I O 40 C to 85 C PMC730CC Rear I O 40 C to 85 C Conduction Cooled PMC730RE replaced by PMC730CC KEY PMC730 ADC FEATURES 16 ADC Resolution 16 differential or 32 single ended analog input channels multiplexed to a single 16 bit ADC Acquisition mode and channels are selected via programmable control registers ADC 10usec Conversion Time A maximum ADC conversion rate of 100KHz is supported Differential or Single Ended
67. ed signals above 1 2 the sample frequency in the input signal for critical applications Reading or writing the ADC Conversion Timer register is possible with 32 bit 16 bit or 8 bit data transfers This register s contents are cleared upon reset SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE ADC Memory Threshold Register Read Write 10H The Memory Threshold register is a 9 bit register that is used to control transition between two 512 deep memory banks One memory bank is used to store converted analog input data while the other is accessible for reading of converted analog input data When the analog input memory buffer contains more samples than the Memory Threshold value the memory banks will switch This allows software to read new converted analog input data The new data must be read before the memory banks switch again If the system cannot keep up by reading the memory buffer before they switch then the automatic disabling of analog input upon memory bank switching can be selected via the control register bit 13 The number of valid analog input data samples available in the memory buffer will be one more than the value set in the Memory Threshold register Thus if the memory threshold value is 33 then 34 valid data entries will be present in memory when the memory buffer switch occurs The Memory Threshold register value can be any value between 0 and 511 An interrupt can also be issued upon exceeding the spec
68. egister Internal or external clock selection has no effect for event counters Event counting may be initially triggered internally via the Trigger Control Register or externally via the Counter Trigger In pin Digital Channel 3 To prevent missing events the counter will continuously wrap around when in up counting mode and resume counting up from zero without requiring a new trigger each time the count limit is reached Upon reaching the count limit an output pulse will be generated at the Counter Output pin and an optional interrupt may be generated If the Interrupt Enable bit of the Counter Control Register is set bit 8 and bit 0 of the Interrupt register is set an interrupt is generated when the number of input pulse events is equal to the constant value stored in the Counter Constant 1 Register The internal counter register is then cleared and will continue counting events until the counter constant value is again reached and a SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE new interrupt generated An interrupt will remain pending until released via bit 12 of the counter control register offset 50H Input Pulse Width Measurement The Counter Timer may also be used to accomplish input pulse width measurement for pulses occurring at the Counter Input pin Digital Channel 2 Pulse width measurement may be triggered internally via the corresponding Counter Trigger Control register or externally via the counter
69. egister will contain the 0 it has counted down to The reload is implemented by either writing the Counter Constant 1 register or by setting bit 11 to logic high 1 and input of a load signal on the Counter Input pin The watchdog timer may be triggered internally via the Trigger Control Register or externally via the Counter Trigger In 23 pin Digital Channel 3 When triggered the counter timer contents are decrement by one each clock cycle until it reaches 0 upon which a watchdog timer time out occurs The current contents of the counter timer can be read from the Counter Readback Register The timer may be clocked via the internal 1 2 4MHz 8MHz clock or by an external clock up to 3 5MHz at the counter clock pin Due to the asynchronous relationship between the trigger and the selected clock the time out may occur within 1 selected clock frequency from the programmed time selected Upon time out the counter output pin returns to its inactive state and an interrupt can be optionally generated The Gate Off signal when active and enabled via bits 18 and 14 of the Counter Control register can be used to stop the counter in watchdog mode The Gate Off signal is input via the Counter Gate off pin Digital Channel 5 Upon detection of a count value equal to 0 the PMC730 will issue an interrupt if enabled via bit 8 of the Counter Control Register and bit 0 of the Interrupt register This could be useful for
70. ence voltage refer to the Use of Calibration Reference Signals section Write accesses to the Reference Voltage Access register are possible via 32 bit or 16 bit data transfers only Storing the gain offset and reference voltages to memory is normally only performed at the factory A software or hardware reset has no affect on this register Calibration Read Data Status Register Read 68H The Calibration Read Data Status register is a read only register used to access calibration data and determine the status of a read cycle initiated by Calibration Access register In addition this register is used to determine the status of a write cycle to the memory When bit 1 of this register is set it indicates the memory is busy completing a write cycle All read accesses to this Data Status register initiate an approximately 1millisecond access to the memory Thus you must wait 1 millisecond after reading this Data Status register before a new read or write cycle to the memory can be initiated EEPROM latency limitation A read request initiated through the Calibration Access register will provide the addressed calibration value on data bits 15 to 8 of the Calibration Read Data Status register Although the read request via the Calibration Access register is accomplished in nano seconds typically the reference voltage digit will not be available in the Calibration Read Data Status register for approximately 2 5 milliseconds
71. ent Front 68 pin SCSI 3 female receptacle header AMP 787082 7 or equivalent Rear I O via 64 pin female receptacle header AMP 120527 1 or equivalent Module 120 160 95 123 70 93mA PMC730 Field l O PMC730R or PMC730CC Field l O Power Requirements 5 12V 5 12V 5 1 Circuit board is selectively coated with a fungus resistant acrylic conformal coating 2 Maximum rise time of 100m seconds ENVIRONMENTAL Operating Temperature 0 to 70 40 85 Version Conduction Cooled PMC730CC Complies with AnSI VITA 20 Mezzanine Card 2001 R2005 Relative Humidity 5 95 Non Condensing Storage Temperature 55 C to 100 C Non Isolated Logic and field commons have a direct electrical connection Radiated Field Immunity RFI Designed to comply with IEC1000 4 3 Level 3 10V m 80 to 1000MHz AM amp 900MHz keyed and European Norm EN50082 1 with error less than 10 596 of FSR Electromagnetic Interference Immunity Error is less than 0 25 of FSR under the influence of EMI from switching solenoids commutator motors and drill motors Surge Immunity Not required for signal I O per European Norm EN50082 1 34 Electric Fast Transient Immunity EFT
72. er is used to initiate a read of the DAC gain and offset calibration coefficients or ADC reference voltage values The analog output calibration data is provided so that software can adjust and improve the accuracy of the analog output voltage over the uncalibrated state Each of the 8 analog output 5 unique offset and gain calibration coefficients are stored in this memory at the addresses given in Table 3 14 The coefficients are 16 bit values with the most significant byte at the even addresses and the least significant bytes at the odd addresses See the Use of Calibration Data section for analog output calibration correction details Reference voltage values are provided so that software can adjust and improve the accuracy of the analog input voltage over the uncalibrated state The reference voltages are precisely measured at the factory and then stored to this location at the addresses given in Table 3 13 See the Use of Calibration Reference Signals section for analog input calibration correction details The Calibration Access Register is a write only register and is used to configure and initiate a read cycle to the calibration memory Setting bit 15 of this register high to a 1 initiates a read cycle Setting bit 15 of this register low to a 0 initiates a write cycle The address of the calibration value to be read must be specified on bits 14 to 8 of the Calibration Access register The addresses o
73. f all calibration data and references are given in Table 3 14 Calibration Access Register Read or Address Write Data Write 14 13 12 11 10 9 8 Table 3 14 Calibration Address Channel Address Hex Address Hex MSB LSB MSB LSB 0 o2 o 6 9 B ADC Reference Voltages Follow Address of 9 88 Volt Reference Hex 21 22 25 26 Address of 4 94 Volt Reference Hex 32 33 34 35 36 37 Address of 2 47 Volt Reference Hex 42 44 45 Address of 1 23 Volt Reference Hex 51 52 55 56 46 47 Reference voltages are stored in memory as a null terminated ASCII character string For example if the value 9 88335 were stored to memory the corresponding ASCII characters would be 39 2E 38 38 33 33 35 00 as shown in Table 3 15 Note the ASCII equivalent of a decimal point is 2E and the null character is 00 For this example the memory should be read starting at address 20H until the null ASCII character is read This string can then be converted into float by using your compiler s function Table 3 15 Example Reference Voltage Example Reference Value lesele 39 38 38 33 33 35 oo The address corresponding to each of the reference voltage digits is given in hex The most significant digit is stored at address 20 hex For additional details on the use of the refer
74. for pulse width modulation counting mode Access to this register is allowed on a 32 bit long word basis only For pulse width modulation this register holds the width of the second part of the pulse The width is defined by this constant 2 value multiplied by period of your clock signal selected via control register bits 9 amp 10 Note that the Counter Constant Registers are cleared set to 0 following a system or software reset Counter Trigger Control Register Write Only Base 60H Bit 0 of this register is used to implement software triggering for the counter timer All other bits of this register are not used When the software trigger source has been selected for a counter function via bits 6 amp 7 of the Counter Control register writing a 1 to bit 0 of this register will cause the counter function to be triggered This bit is not stored and merely acts as a trigger for the start of the corresponding counter function Triggering may be used to initiate pulse width modulation one shot watchdog countdown initiates countdown or pulse width or period measurement It may also be used to initiate event counting but unlike the other counter timer functions event counters will automatically recycle without re triggering Writing to this register is possible via 32 bit 16 bit or 8 bit data transfers SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Calibration Access Register Write 64H This regist
75. fy the corresponding channel to be updated Samples are read from the FIFO and moved to the channel corresponding to its tag until an end of sample flag is detected The end of sample flag makes it possible to update only one channel or up to all channels for each output conversion cycle Those channels not updated by the FIFO will maintain and output the last sample read for the new conversion cycle interrupt Upon Reaching FIFO Threshold Level An interrupt can be generated when the number of remaining FIFO samples reaches a programmable threshold level This feature can be used to minimize CPU interaction Continuous New Data Conversion Mode Data must be written to the 1024 sample FIFO from the PCI bus at a rate that prevents the FIFO from reaching empty status Maintenance of new data in the FIFO is important since sample data is continually read from the FIFO at the rate set by a conversion timer Recycle Same Data Conversion Mode This mode allows continuous recycling of the same FIFO samples starting with the first sample written after a reset and ending at the location of the last sample written to the FIFO User Programmable Conversion Timer A user programmable conversion timer is provided to control the delay between conversions During the period of each conversion interval new digital values are read from FIFO memory and then all channels are simultaneously converted This feature supports a minimum interval of
76. ge Drift 123 750 V C Output Load Stability Note 16 Software calibration minimizes these error components External Trigger Input Output Negative edge triggered Must be an active low 5 volt logic TTL compatible debounced signal referenced to digital common Conversions are triggered within 12 3751 seconds of the falling edge Minimum pulse width is 250n seconds Active low 5 volt logic TTL compatible output is generated The trigger pulse is low for typically 500n seconds As Digital Input Output 16 Bi directional TTL Transceivers Direction controlled as two groups of 8 channels Reset Power Up Condition Default to Input Pull up Resistors 4 7KQ resistor networks are installed in sockets Each network has 8 resistors 3 0V typical 0 3V typical 15 0mA 64mA 2 0V minimum 0 8V maximum 200 typical Debounce circuitry allows individual debounce of 16 channels Debounce Intervals 4us 64us 1m and 8m Note 17 The 16 digital I O lines of this module are assembled in groups of eight Each group of eight can be configured as input or output The first group of eight is on pins 2 to 9 front or pins to 10 rear I O The remaining group is on pins 36 to 43 front or pins 11 to 18 rear 1 0 The digital I O signals TTL with 4 7K socketed pull up resistors These
77. hat several readings e g 512 of the calibration count parameters should be taken via the ADC and averaged to reduce the measurement uncertainty since these points are critical to the overall system accuracy SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE DAC MODES OF CONVERSION The PMC730 provides four methods of analog output operation for maximum flexibility with different applications The following sections describe the features of each method and how to best use them DAC Single Conversion Mode In Single Conversion mode of operation sample data is written to the DAC FIFO buffer with channel tag values The tag value is a 3 bit value present on bits 18 to 16 This mode can be used to update a single DAC channel or any number up to all DAC channels with new analog output voltage The end of sample flag bit 19 is utilized to identify the last channel to be converted in this single conversion cycle With a conversion trigger initiated by software via the DAC Start Convert register or external trigger the digital values are moved to their corresponding converter for update of their analog output signal It is possible to keep a given channel s analog voltage unchanged by simply not updating the corresponding DAC channel Only those channels with updated digital values will result in different analog output voltages To select this mode of operation bits 1 and 0 of the DAC Control register must be set to digital
78. hen enabled as an output 1 0 18 FUNCTION digital channels 8 to 15 must be selected as output If External Trigger input or output is not required the External Trigger should be configured as Disabled 0 Disable Interrupt 1 Enable Interrupt If enabled via this bit an interrupt request from the module will be issued to the system if the FIFO contains less than the threshold number of bytes selected via the threshold register The interrupt request will remain active until the interrupt condition is removed or by disabling interrupts via this bit The interrupt condition can be removed by writing more data to the FIFO buffer thus extending the number of samples above the set threshold Interrupts should not be enabled if Enable Recycle Same Data Conversion mode is selected FIFO Pointer Reset This bit must be set prior to writing data to the DAC FIFO when Recycle Same Data mode is used Typical sequence is 1 Select Recycle Same Data mode and set this bit 2 Write all data to be cycled to DAC FIFO 3 Start Recycle Same Data mode 0 Interrupt Not Pending 1 Interrupt Pending A pending interrupt will remain active until the number of samples in Memory is more than the set threshold or until DAC interrupts are disabled via bit 4 of this register 0 1 FIFO Not Empty 0 FIFO has gt samples than set threshold 1 FIFO has less samples than set threshold 0 FIFO Not Full
79. ified threshold level if enabled via bit 0 of the interrupt register and bit 11 of the ADC Control register This interrupt indicates that new data is available in the memory buffer The interrupt request can also be disabled by setting bit 0 of the Interrupt register to a logic zero or bit 11 of the ADC Control register to logic O The interrupt request will remain active until released via a read of the Analog Data Memory buffer Reading or writing to this register is possible via 32 bit 16 bit or 8 bit data transfers This register s contents are set to 1FF hex 511 decimal upon reset ADC Start Convert Register Write Only 14H The ADC Start Convert register is write only and is used to trigger ADC conversions by setting data bit 0 to a logic one The first conversion is initiated in hardware 10us after this software start convert is set This method of starting conversions is most useful for its simplicity and for when precise time of conversion is not critical Typically software triggering is used for initiating the first conversion The ADC Control Channel Enable and Conversion Timer register must first be configured before the Start Convert bit is set This register can be written via 32 bit 16 bit or 8 bit data transfer Data bit O must be a logic one to initiate data conversions Start Convert Register Not Used Start Convert 3n xe wroe o JD ono 15 ADC Memory Buffer Read Only 800H to FFCH
80. ion and configuration via the Configuration Address space This PMC module provides 256 bytes of configuration registers for this purpose The PMC730 contains the configuration registers shown in Table 3 1 to facilitate Plug and Play compatibility The Configuration Registers are accessed via the Configuration Address and Data Ports The most important Configuration Registers are the Base Address Registers and the Interrupt Line Register which must be read to determine the base address assigned to the PMC730 and the interrupt request line that goes active on a PMC730 interrupt request Table 3 1 Configuration Registers Fa D31 D24 D23 D16 D15 D8 D7 DO 0 10 4457 Vendor ID 1655 Status Command Class Code 118000 Rev ID 00 Cache 32 bit Memory Base Address for PMC730 4K Byte Block Not Used Subsystem ID 0000 Subsystem Vendor 10 0000 Reserved MEMORY MAP i 2 MUN 5 10 13 14 15 This board is allocated a 4K byte block of memory that is addressable in the PCI bus memory space to control the multiple functions of this module Three types of information are stored in the memory space control status and data The memory space address map for the PMC730 is shown in Table 3 2 Note that the base address for the PMC730 in memory space must be added to the addresses shown to properly access the PMC730 registers Register accesses as 32 16 and 8 bit in memory space are permitted SE
81. le if you were to measure a pulse with a half second duration using the counter measurement function your accuracy would be 50us 37 PCI Local Bus Interface Compatibility Electrical Mechanical Interface PCI Target 4K Memory Space Required PCI commands Supported Conforms to PCI Local Bus Specification Revision 2 2 and PMC Specification P 1386 1 Single Width PMC Module Implemented by Altera FPGA One Base Address Register Configuration Read Write Memory Read Write 32 16 and 8 bit data transfer types supported 5V Compliant 3 3V Tolerant Interrupt A is used to request an interrupt Source of interrupt can be from the ADC DAC Digital or Counter Function 8 PCI Clock Cycles for all non burst register accesses Burst read of the 512 sample ADC memory buffer requires three PCI clock cycles for each sample read A write access to the DAC FIFO Buffer will typically be executed in 8 PCI clock cycles On rare occasions the write will complete as a retry termination The retry termination is necessery to avoid FIFO Buffer contention when a FIFO read is initiated simultaneously with an internal FIFO write On a retry termination the bus master is forced to initiate another write to the same address at a later time SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE APPENDIX CABLE MODEL 5028 432 SCSI 3 to Round Shielded Type Round shielde
82. lizing the counter Once an interrupt request caused by a counter function is generated on the 730 it will continue to assert the interrupt request until Interrupt Release bit 12 is set to logic 1 or interrupts are disabled The counter interrupt can be disabled via bit 8 of the counter control register and all PMC730 interrupts can be disabled via bit 0 of the Interrupt register at base address 0 Upon detection of a count value equal to 0 the watchdog timer will initiate an interrupt This could be useful for alerting the host that a watchdog timer time out has occurred and may need to be reinitialized An interrupt can also be generated when an event count reaches the value stored in the Counter Constant 1 register An interrupt may also be generated when pulse width or periodic rate measurement has been completed Finally an SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE interrupt may also be generated at each signal transition for Pulse Width Modulation or One Shot generation For these interrupts to be enabled bit 8 of this Counter Control Register must be set to a logic high and bit O of the Interrupt register at base address 0 must also be set to a logic high The Counter Control Register is cleared set to 0 following a reset thus disabling the counter timer Reading or writing to this register is possible via 32 bit or 16 bit data transfers Counter Readback Register Read Only Base 54H
83. m single mode of operation conversions are performed once in sequential order for all channels enabled via the ADC Start End Channel Value registers The interval between conversions is controlled by the ADC Conversion Timer The ADC Conversion Timer must be used in this mode of operation After software selection of the uniform single mode of operation conversions are started either by an external trigger or by setting the software start convert bit If the external trigger is to be used bits 2 and 1 of the Control register must be set to 01 to accept the external trigger as an input signal Interrupts can be enabled to go active when the Memory buffer contains more samples than the set threshold value The interrupt condition will remain set until interrupts are disabled or ADC data is read from the Memory ADC Burst Continuous Mode In burst continuous mode of operation conversions are continuously performed in sequential order for all channels enabled via the ADC Start End Channel Value registers The interval between conversion for all enabled channels will be fixed at 15u seconds However the interval after conversion of a group of channels can be controlled by the ADC Conversion Timer register The timer can be disabled via bit 6 of the ADC control SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE register If disabled the interval between conversions will be fixed at 15 seconds Burst modes can be used to pro
84. m software at power up to configure the card The PMC730 module is a Plug and Play card As a Plug and Play card the board s base address and system interrupt request line are not selected via jumpers but are assigned by system software upon power up via the configuration registers PCI bus configuration access is used to read write a PCI card s configuration registers PCI Configuration Address Space When the computer is first powered up the computer s system configuration software scans the PCI bus to determine what PCI devices are present The software also determines the configuration requirements of the PCI card The system software accesses the configuration registers to determine how many blocks of memory space the carrier requires It then programs the PMC module s configuration registers with the unique memory base address The configuration registers are also used to indicate that the PMC module requires an interrupt request line The system software then programs the configuration registers with the interrupt request line assigned to the PMC module Since this PMC module is relocatable and not fixed in address space this module s device driver must use the mapping information stored in the module s Configuration Space registers to determine where the module is mapped in memory space and which interrupt line will be used Configuration Registers The PCI specification requires software driven initializat
85. mmable Memory Threshold level When the memory buffer has more samples than set in the Memory Threshold register the PMC interrupt signal INTA is driven active to the carrier CPU to request an interrupt Bit 1 of the Interrupt register at Base Address can be read to identify a pending interrupt The interrupt release mechanism employed is release on register access The PMC730 will release the interrupt request when bit 12 of the ADC Control register at Base Address 04H is set to a logic 1 ADC Reference Voltage Memory Control Logic The FPGA of the PMC730 module contains control logic that implements read and write accesses to reference voltage memory The reference voltage memory EEPROM contains an ASCII null terminated string that represents the exact voltage of the on board reference circuit as measured and stored at the factory DAC CONVERSION CONTROL LOGIC All logic to control data conversions is imbedded in the module s FPGA The control logic of the PMC730 is responsible for controlling the user specified mode of operation Once the IP module has been configured the control logic performs the following e Controls serial transfer of data from the FPGA to the corresponding DAC register based on the selected mode of operation Provides external or internal trigger control Controls read and write access to calibration memory Controls issue of interrupt requests Provides status on FIFO Full FIFO Threshold
86. nal trigger input signals must be TTL compatible As an output an active low TTL signal is driven from the PMC730 The trigger pulse generated is low for 500n seconds typical The external trigger connections are made via the DAC SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Trigger Out pin Digital Channel 9 of the Field Connector For all modes of operation the external trigger is enabled as an output via bits 3 and 2 of the control register See section 3 0 for programming details to make use of this signal DAC Interrupt Control Logic The PMC730 can be configured to generate an interrupt on a programmable FIFO Threshold When the FIFO contains less samples than the set Threshold an interrupt will be issued The interrupt will remain asserted to the system as long as the FIFO contains less data than the set threshold and interrupts remain enabled DAC Calibration Memory Control Logic The FPGA of the PMC730 module contains control logic that implements read and write accesses to calibration memory The calibration memory EEPROM contains offset and gain coefficients for each of the DAC channels Calibration of the individual DACs is implemented via software to avoid the mechanical drawbacks of hardware potentiometers COUNTER TIMER CONTROL LOGIC Six different counter timer modes may be selected Pulse Width Modulation Watchdog Event Counting Pulse Measurement Period Measurement and One Shot Counte
87. of the converter s clock signal instead of an external clock minimizes 30 the danger of digital noise feeding through and corrupting the results of a conversion in process The converted data serially shifted from the ADC to the FPGA represents the analog signal digitized in the previous convert cycle That is the ADC transfers digitized analog input data to the FPGA one convert cycle after it has been digitized Upon initiation of an ADC convert cycle the analog input data is digitized and stored into an internal ADC buffer Also during this cycle the last converted data value is moved from the ADC buffer to the FPGA s Memory Buffer Understanding this sequence of events is important when using the External Trigger Only scan mode The first digitized value received from the ADC in External Trigger Only mode will not be written to the Memory buffer if the Start Convert bit is set prior to issuance of the first external trigger signal This first value received from the ADC is digitized data that has remained in the ADC s buffer from a previous data acquisition session Likewise to update the Memory buffer with the last desired digitized data value one additional convert cycle is required For all other scan modes the FPGA control logic will automatically discard the first digitized data value received from the ADC It is not written to the Memory buffer In addition the FPGA logic also automatically generates the required fl
88. onfigured as inputs on system reset or power up The unused upper bits of this register are Not Used and will always read low 0 s Reading or writing to this register is possible via 32 bit 16 bit or 8 bit data transfers Digital Interrupt Enable Registers Read Write Base 40H The Interrupt Enable Registers provide a mask bit for each of the 16 channels A 0 bit will prevent the corresponding input channel from generating an external interrupt A 1 bit will allow the corresponding channel to generate an interrupt The Interrupt Enable register at the base address offset 40H is used to control channels 0 through 15 via data bits 0 to 15 For example channel 0 is controlled via data bit 0 All input channel interrupts are disabled set to 0 following a power on or software reset Reading or writing to this register is possible via 32 bit 16 bit or 8 bit data transfers Digital Interrupt Status Registers Read Write Base 42H The Interrupt Status Register reflects the status of each of the interrupting channels A 1 bit indicates that an interrupt is pending for the corresponding channel A channel that does not have interrupts enabled will never set its interrupt status flag A channel s interrupt can be cleared by writing a 1 to its bit position in the Interrupt Status Register writing a 1 acts as a 24 reset signal to clear the set state However if the condition which caused
89. ontinuous uniform single burst continuous burst single and convert on external trigger only In all modes a single channel or a sequence of channels may be converted The following sections describe the features of each and how to best use them ADC Uniform Continuous Mode In uniform continuous mode of operation conversions are performed continuously in sequential order for all channels enabled via the ADC Start End Channel Value registers The interval between conversions is controlled by the ADC Conversion Timer register The ADC conversion timer must be used in this mode of operation After software selection of the uniform continuous mode of operation conversions are started either by an external trigger or by setting the software start convert bit If the external trigger is to be used bits 2 and 1 of the ADC Control register must be set to 01 to accept the external trigger as an input signal Stopping the execution of uniform continuous conversions is possible by writing 000 to the Scan Mode bits 10 8 of the ADC Control register See the Control register section for additional information on the Scan Mode control bits and the Control register board address location Interrupts can be enabled to go active when the Memory buffer contains more samples than the set threshold value The interrupt condition will remain set until interrupts are disabled or ADC data is read from the Memory ADC Uniform Single Mode In unifor
90. ontinuous is selected the conversion timer controls the delay after a group of channels are converted before conversion is initiated on the group again External Trigger Input or Output The external trigger is available through the digital input output channels This external trigger may be configured as an input output or disabled As an output this signal provides a means to synchronize other modules to a single PMC730 timer reference As an input the signal will trigger the PMC730 hardware to initiate data conversions Precision On Board Calibration Voltages Calibration autozero and autospan precision voltages are available to permit host computer correction of conversion errors The calibration voltages can be converted and then compared to the expected value stored in on board memory Calibration voltages include OV local analog ground and precision 9 87 4 93 2 46 and 1 23 volt references e Fault Protected Input Channels Analog input overvoltage protection to 25V with power on and 40V with power off SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE KEY PMC730 DAC FEATURES 16 Bit DAC Resolution 16 bit differential DAC with 10V bipolar voltage output range 12 375usec Conversion Time maximum recommended conversion rate of 80 8KHz is supported 1024 Sample FIFO Buffer A single FIFO buffer is provided to store analog output channel samples Each sample must have a tag to identi
91. put voltage For Continuous New Data Conversion mode conversions once triggered continue at the frequency set by the DAC Conversion timer register In Continuous New Data Conversion mode data is supplied from the FIFO If the FIFO becomes empty the last valid value output will remain unchanged For Recycle Same Data Conversion Mode sample data is provided from the FIFO A Recycling of the FIFO data starts with the first value written to the FIFO after a reset and ending with the last value written to the FIFO The output data is Recycled in an unending loop Writing to the FIFO while this mode is actively running will result in unpredictable DAC output voltage control The FIFO must be preloaded before this mode of operation is triggered External Trigger 00 11 Disabled 01 Input Active Low 10 Output It is possible to synchronize the DAC output of multiple modules A single master module must be selected to output an external trigger signal while all other modules are selected to input the external trigger signal When enabled as an input the external trigger signal is provided via the DAC Trigger In pin Digital Channel 1 When enabled as an output the external trigger signal is provided via the DAC Trigger Out pin Digital Channel 9 Thus Digital Channel 1 or 9 if selected will not be available as a general digital I O channel When enabled here as an input digital channels 0 to 7 must all be selected as input W
92. r output is an open drain n channel mosfet The drain is pulled up to 5V via an on board 4 7K resistor default or can be left for external pull up according to the placement of the jumper The use of an external supply allows the drain pullups to adjust to different drive levels Counter timer input control signals counter input external clock gate off and external trigger are available via digital I O channels 2 to 5 See table 2 2 for the list of these signals and their corresponding digital channel The digital channels 0 to 7 must all be selected as input if any one of these counter timer input control signals is to be used DIGITAL INPUT OUTPUT LOGIC The digital field I O interface to the PMC730 board is provided through Field Connector refer to Table 2 2 Field points are NON ISOLATED This means that the field return and logic common have a direct electrical connection to each other As Such care must be taken to avoid ground loops lgnoring this effect may cause operation errors and with extreme abuse possible circuit damage Digital input output signals to the FPGA are buffered using octal buffered line drivers Field inputs to these buffers include transient protection devices on each line and 4 7K pullups to 5 Output operation is considered Fail safe That is the Digital Input Output signals are always configured as input upon power up reset or software reset This is done for safety reasons to ens
93. ration A one shot pulse waveform may also be generated Event Counter The counter can be configured to count input pulses or events A gate off signal is provided to control count up upon each event or countdown with each event Interrupt generation upon programmed count condition is available e Watchdog Timer The counter can be configured as countdown timer for implementation as a watchdog timer A gate off signal is available for use to stop the count down operation Interrupt generation upon a countdown to zero condition is available Pulse Width or Period Measurement The counter can be configured to measure pulse width or waveform period In addition an interrupt can be generated upon measurement complete Programmable Interface Polarity The polarities of the counter s external trigger input and output pins are programmable for active high or low operation These counter control signals are available through the digital input output channels Internal or External Triggering A software or hardware trigger is selectable to initiate waveform generation watchdog countdown event counting pulse width measurement or period measurement KEY PMC730 DIGITAL INPUT OUTPUT FEATURES 16Digital Input Output Channels Interface with up to 16 input output channels which can be configured as input or output in groups of eight channels TTL Compatible Thresholds Input and output thresholds are at T
94. rip markings on the termination panel 1 68 correspond to field pins 1 68 on the PMC module Each PMC module has its own unique pin assignments Refer to the PMC module manual for correct wiring connections to the termination panel Schematic and Physical Attributes See Drawing 4501 920 Field Wiring 68 position terminal blocks with screw clamps Wire range 12 to 26 AWG Mounting Termination panel is snapped on the DIN mounting rail Printed Circuit Board Military grade FR 4 epoxy glass circuit board 0 063 inches thick Operating Temperature 40 to 100 Storage Temperature 40 C to 100 Shipping Weight 1 0 pounds 0 5kg packaged 38 MULTIFUNCTION MODULE SERIES PMC730 PCI MEZZANINE CARD 8 lost 9 93908 OWd SLINFT NIHLIM SI FINGOW Od SIH L 0vG 0 SI 10442094409 ANY IWA 303 IN3NOdWOO WNWIXYN 3H SLIATT NIHLIM S SINGOW OWd SIHL 98 Ld GYVAONVLS TIVODINVHO3N OWd Yad 1 ZES SI GHYVOE NdO YTINNVO IHL 440 WLOL 3H NIHLIM SI FINGOW OWd 98 Ld QNVONVIS TVOINVHOSW OWd 33d 006 6 SI JINGOW Od 30 ACIS 43010S JHL NO 32vdS 3 18V3Sn 3H 349 N31H9IL S30v1d NMOHS SY JINGOW 2d OLNI GNV ndOo s3lHsvo Od JO JAIS 930105 v WALI SM3YOS Qv3H 1v14 1835 u1u900 01 VEL SI CAYO NdO YTINYVI
95. rrors see following section This will be acceptable for some applications SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE DAC Calibrated Performance Accurate calibration of the PMC730 DAC output signals can be accomplished through software control by using calibration coefficients to adjust the analog output voltage Unique calibration coefficients are stored in memory for each channel as shown in Table 3 14 Once retrieved the channel s unique offset and gain coefficients can be used to correct the data value sent to the DAC channels to accurately generate the desired output voltage See the specification chapter for details regarding maximum calibrated error For applications needing better accuracy the software calibration coefficients should be used to correct the Ideal Digital Input value into a Corrected Digital Input value This is accomplished by using equation 4 Equation 4 CorrectDigVal Vout 10 Gain Correct Offset Correct where Gain Correct Stored Gain Error 1 000 000 1 x 3276 75 Offset Correct Stored Offset Error 100 Ideal Digital Input is determined from equation 3 given above Stored Gain Error and Stored Offset Error are written at the factory and are obtained from memory on the PMC730 on a per channel basis The Stored Gain Error and Stored Offset Error are stored in memory as two s complement numbers Refer to the Calibration Access Register section for details on
96. s By the count of 20hex all eight channels of FIFO data have been read from the FIFO and loaded into internal FPGA data holding registers At this time channels 0 to 3 and 4 to 7 will be moved serially to their corresponding DAC The FIFO read circuitry uses the PCI clock which must not be less than 16MHz for DAC loading circuit to function correctly It is not required to update all DAC data on every FIFO refresh cycle Channels not update will retain their last valid DAC data value The update of a subset of all the channels if desired is controlled by the use of the FIFO Sample Valid Flag bit 19 which goes active high on the last valid data for the present FIFO cycle Those channels not updated will retain their last analog output value On power up or software reset the holding registers will be cleared DAC External Trigger The external trigger connections are made via the DAC Trigger In pin Digital Channel 1 of the Field Connector For all modes of operation when the external trigger input is enabled via bits 3 and 2 of the DAC Control register the falling edge of the external trigger will initiate conversions for all channels For External Trigger Input mode bits and 2 set to digital value 01 each falling edge of the external trigger causes a conversion at the DAC Once the external trigger signal has been driven low it should remain low for a minimum of 250n seconds for proper external trigger operation The exter
97. s It is suggested that salvageable shipping cartons and packing material be saved for future use in the event the product must be shipped This board is physically protected with packing material and electrically protected with an anti static bag during shipment However it is recommended that the board be visually inspected for evidence of mishandling prior to applying power The board utilizes static sensitive components and should only be handled at a static safe workstation CARD CAGE CONSIDERATIONS Refer to the specifications for loading and power requirements Be sure that the system power supplies are able to accommodate the power requirements of the carrier board plus the installed PMC modules within the voltage tolerances specified IMPORTANT Adequate air circulation or conduction cooling must be provided to prevent a temperature rise above the maximum operating temperature The dense packing of the PMC module to the carrier CPU board restricts air flow within the card cage and is cause for concern Adequate air circulation must be provided to prevent a temperature rise above the maximum operating temperature and to prolong the life of the electronics If the installation is in an industrial environment and the board is exposed to environmental air careful consideration should be given to air filtering In a conduction cooled assembly adequate thermal conduction must be provided to prevent a temperature rise above
98. s written to the DAC Conversion Timer register DAC Conversion Timer Value T seconds x 8 000 000Hz Where T the desired time period between trigger pulses in seconds The DAC Conversion Timer value can be a minimum of 96 decimal DAC FIFO Interrupt Threshold Read Write Base 28H The DAC FIFO Interrupt Threshold register is a 10 bit register that is used to set a threshold upon which an interrupt will be generated When the FIFO contains less samples than the FIFO Interrupt Threshold value an interrupt will be issued This register allows selection of any FIFO depth level This interrupt indicates that new data should be written to the FIFO An interrupt request will remain asserted to the system as long as the FIFO contains less data than the set threshold and interrupts are enabled The interrupt request can be removed by 1 disabling interrupts on the module or 2 writing data to the FIFO until it has more samples than that set by the Threshold register Note interrupts must first be enabled in the Interrupt Enable register 611 0 and the DAC Control register bit 4 Reading or writing to this register is possible via 32 bit 16 bit or 8 bit data transfers This register s contents are set to zero upon reset DAC Start Convert Register Write Only 2CH The DAC Start Convert register is write only and is used to trigger DAC conversions by setting data bit 0 to a logic one This method of starting
99. sed Not Used Not Used 31 21 Tag bits 20 16 Data 15 0 512 Memory Location Not Used 31 21 Tag bits 20 16 Data 15 0 10 Notes Table 3 2 1 PMC730 will return 0 for all addresses that are Not Used 2 This byte is reserved for use at the factory to enable writing of the reference voltage Write only byte value This memory map reflects byte accesses using the Little Endian byte ordering format Little Endian uses even byte addresses to store the low order byte The Intel x86 family of microprocessors uses Little Endian byte ordering Big Endian is the convention used in the Motorola 68000 microprocessor family and is the VMEbus convention In Big Endian the lower order byte is stored at odd byte addresses Interrupt Register Read Write Base 00H This read write register is used to enable PMC730 interrupt operation determine the pending status of interrupts and release pending interrupts The function of each of the interrupt register bits are described in Table 3 3 This register can be read or written with either 8 bit 16 bit or 32 bit data transfers A power up or system reset sets all interrupt register bits to 0 Table 3 3 Interrupt Register FUNCTION Board Interrupt Enable Bit Read Write Bit 0 Disable Interrupt 1 Enable Interrupt If enabled via this bit an interrupt request from the module will be issued to the system upon any of
100. sponsible for controlling the programmed mode of operation Once the PMC module has been configured the control logic performs the following e Controls the channel multiplexers based upon start and end channel values and single ended or differential analog input mode e Controls serial transfer of data from the ADC to the FPGA memory buffer Controls conversion rate as user programmed e Provides memory buffer switch control e Provides external or internal trigger control e Controls read and write access to the reference voltage values stored in memory e Controls interrupt requests to the carrier CPU and responds to interrupt select cycles Field Analog Input The field I O interface to the board is provided through front connector refer to Table 2 1 Field I O signals are NON ISOLATED This means that the field return and logic common have a direct electrical connection to each other As such care must be taken to avoid ground loops see Section 2 for connection recommendations Ignoring ground loops may cause operational errors and with extreme abuse possible circuit damage Refer to Drawing 4501 913 for example wiring and grounding connections SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Analog inputs and calibration voltages are selected via analog multiplexers PMC730 control logic automatically programs the multiplexers for selection of the required analog input channel The required control is
101. t and that each digitized data value must have a corresponding tag to identify the channel to be updated The sample flag bit must be set to a logic one to identify the last value data sample of the present conversion cycle Also notice that the first value written to the FIFO is shown in the last row of this table Likewise the second value written is shown in the second from the last row 0000 7FFF 0 3 S oE f 0 1 8000 First Value Read Care should be taken when writing data to the FIFO buffer to insure the FIFO is not full when a new write is initiated The FIFO Full flag bit Control register bit 15 can be read prior to writing the FIFO to avoid this error Data is not stored in the FIFO once it becomes full New FIFO locations are available after data transfers to the DAC are initiated In addition the FIFO can be cleared by implementing a software or hardware reset or by setting bit 5 of the DAC control register to a logic high DAC Uncalibrated Data The DAC data must be written in straight binary format The ideal digital input value for a given output voltage can be calculated using equation 3 Equation 3 Ideal DigVal AX x Vout 32768 For example a Vout of 5 volts results an Ideal Digital Input value of 16 384 decimal The corresponding hexadecimal code of 4000 hex must be written on data bits 15 to 0 This equation does not correct the offset and gain e
102. t pulse that is asserted active after the time defined by the Counter Constant 1 register The duration of the active pulse is defined by the Counter Constant 2 register The one shot pulse waveform will be generated one time and repeated each time it is re triggered Due to the rise fall time delay of the output mosfet driver a fixed delay of 1 to 2us will be added to the pulse duration programmed into the counter constant registers One Shot generation may be triggered externally via the Trigger input or internally via the Counter Trigger Control Register according to the state of the trigger source bit 7 in the Counter Control Register An initial trigger software or external causes the count down sequence to begin An interrupt can be generated upon pulse generation if the interrupt enable bit 8 of the Counter Control Register is set and interrupt enable bit 0 of the Interrupt register is set The interrupt will remain pending until released via bit 12 of the Counter Control register or disabled via bit 8 of the Counter Control register SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Table 3 12 Counter Timer Modes Overview PWM Watchdog Event Count Pulse Meas Period Meas One Shot Counter Input Dig Ch 2 Used to cause reload of counter Bit 11 must be high Event input Input Pulse to be Measured Input Period to be Measured Clocks External Clock Dig Ch 4 1MHz 4MHz 8MHz and ex
103. te off Digital CH6 8 DigitalCHi4 42 Digital CH7 9 Digital CH15 COMMON Analog Out CH4 463 1257 a30 33 COMMON Analog Out CHA Analog In 524 08 60 Analog In S18 D2 66 Analog In 516 00 68 Front panel connector pin assignments are shown in Table 2 2 When reading Table 2 2 note that channel designations are abbreviated to save space Notes Table 2 1 1 The PMC730 board is shipped from the factory for the ADC input range of 10 volts 2 above a number indicates a repeating digit e g 3 3 3 333 SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE IMPORTANT All unused analog input pins should be tied to analog ground Floating unused inputs can drift outside the input range causing temporary saturation of the input analog circuits Recovery from saturation is slow and affects the reading of the desired channels Rear J4 Field I O Connector On models with rear I O the J4 PMC connector provides the field I O interface connections This connector is 64 pin female receptacle header AMP 120527 1 or equivalent which mates to the male connector or the carrier CPU board AMP 120521 1 or equivalent Table 2 3 PMC730R or PMC730CC Rear Field I O Pin Connections PinDescription Pin Pin Description Pin COMMON Analog In S30 D14 Analog In 513 013 35 ADC Trigger In DAC Trigger In Dig CH2 5 Analog In 512 012 Countering r
104. ternal 1MHz 4MHz 8MHz and external Fixed in Hardware not Selectable 1MHz 4MHz 8MHz and external 1MHz 4MHz 8MHz and external 1MHz 4MHz 8MHz and external Gate Off Dig Ch5 When active stops the counter When active causes count down mode on events External Trig Dig Ch 3 Starts PWM Starts Count Down Start Event Counting Next complete pulse after trigger is measured Next complete period after trigger is measured Starts One Shot Generation Internal Software Trig Starts PWM Starts Count Down Start Event Counting Next complete pulse after trigger is measured Next complete period after trigger is measured Starts One Shot Generation Counter Timer Output Output Waveform Output is active from trigger until terminal count 4us pulse is output upon reaching the count limit 4us pulse is output upon end of pulse measurement 4us pulse is output upon end of period measurement Pulse Output Constant 1 Reg Count down from value loaded Counts down from value loaded Must always load before trigger Note that the Counter input can be used to reload Count Limit Input events are counted up to the count limit then a 1us pulse is output Count down value until pulse generated Constant 2 Reg Count down from value loaded Count down value for Pulse Duration
105. the PMC730 interrupt conditions The interrupt request will remain active until the interrupt release bit is Set or by disabling interrupts via this bit Board Interrupt Pending Status Bit Read Only Bit 0 Interrupt Not Pending 1 Interrupt Pending This bit can be read to determine the interrupt pending status of the PMC730 When this bit is logic 1 an interrupt is pending and will cause an interrupt request if bit 0 of the register is set When this bit is a logic an interrupt is not being requested Once the bit is in the pending status it will remain until the pending interrupt is removed via the source of the interrupt This bit will remain active even if interrupts are disabled via bit 0 When this bit is set the pending interrupt can originate from the ADC DAC Digital I O or Counter Functions To identify the source of the pending interrupt the following register bits must be read e Bit 12 of the ADC Control Status Register e Bit 12 of the DAC Control Status Register e Bits 15 to 0 of the Digital Interrupt Status Reg e Bit 12 of the Counter Control Register 18102 Not Used Software Reset The PMC730 module is reset Not Used Notes Table 3 3 1 All bits labeled Not Used will return logic when read SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE Analog Input Ranges and Corresponding Digital Output Codes Selection of an analog input range is implemented via
106. the DIP switch settings given in Table 2 1 The ideal input voltage corresponding to each of the supported input ranges is given in Table 3 4 In Table 3 5 the digital output code corresponding to each of the given ideal analog input values is given in both binary two s complement and straight binary formats Table 3 4 Supported Full Scale Ranges and Ideal Analog DESCRIP ANALOG INPUT Input 10V 0 10V 5V Oto5V 3 3 Volt Range LSB Least Significant Bit Weight Full Scale 305uV 153uV 153uV 102uV 9 999695 9 999847 4 999847 4 999924 43 3 Volt Volts Volts Volts Volts Minus One LSB One LSB 305uV 4 999847 15 2 499924 102uV Below Volts Volts Midscale Scale The digital output format is controlled by bit 0 of the Control register The two formats supported are Binary Two s Complement and Straight Binary The hex codes corresponding to these two data formats are depicted in Table 3 5 Table 3 5 Digital IGHALOUTEUT Codes and Input Voltages DIGITALOUTPUT OUTPUT Binary 2 s Comp Straight Binary DESCRIPTION Hex Code Hex Code Full Scale 1 LSB 7FFF FFFF 0000 8000 1 LSB Below FFFF 7FFF Midscale Full Scale 8000 0000 11 ADC MODES OF CONVERSION The PMC730 provides five different modes of analog input acquisition to give the user maximum flexibility for each application These modes of operation include uniform c
107. the interrupt to occur remains the interrupt will be generated again unless disabled via the Interrupt Enable Register In addition an interrupt will be generated if any of the channels enabled for interrupt have an interrupt pending i e one that has not been cleared Writing 0 to a bit location has no effect that is a pending interrupt will remain pending The Interrupt Status register at the base address offset 42H is used to control channels 0 through 15 via data bits 31 to 16 For example channel 0 is controlled via data bit 16 Reading or writing to this register is possible via 32 bit 16 bit or 8 bit data transfers Interrupt Type COS or H L Configuration Registers Read Write Base 44H The Interrupt Type Configuration Registers determine the type of input channel transition that will generate an interrupt for each of the 16 possible interrupting channels A 0 bit selects interrupt on level An interrupt will be generated when the input channel level specified by the Interrupt Polarity Register occurs i e Low or High level transition interrupt A 1 bit means the interrupt will occur when a Change Of State COS occurs at the corresponding input channel i e any state transition low to high or high to low The Interrupt Type Configuration register at base address offset 44H is used to control channels 0 through 15 For example channel 0 is controlled via data bit 0 All bits are set to 0
108. the maximum operating temperature BOARD CONFIGURATION The board may be configured differently depending on the application All possible DIP switch and jumper settings will be discussed in the following sections The DIP switch and jumper locations are shown in Drawing 4501 911 Remove power from the carrier CPU board when configuring hardware jumpers installing PMC modules cables termination panels and field wiring Refer to Mechanical Assembly Drawing SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE 4501 844 and the following discussion for configuration and assembly instructions Default Hardware Jumper DIP Switch Configuration When the board is shipped from the factory it is configured as follows e Analog input range is configured for a bipolar input with 20 volt span i e an ADC input range of 10 volts J3isopen Plus 3 3 volts is provided from an on board regulator e J4is installed providing a 4 7K open drain pull up for the counter timer output signal e default configuration of the programmable software control register bits at power up are described in section 3 The control registers must be programmed to the desired configuration before starting data input or output operation Analog Input Range Hardware Configuration The ADC input range is programmed via hardware DIP Switches The DIP switches control the input voltage span and the selection of unipolar or bipolar input ranges
109. ure reliable control under all conditions Digital channels of this model can be configured to generate interrupts for Change Of State COS and input level polarity match conditions on all channels channels 0 15 The interrupt is 32 released via a write to the corresponding bit of the Digital Interrupt Status register Digital Input Debounce Control Logic Each of the 16 digital channels can be individually debounced Four debounce durations are available 4u seconds 64 seconds 1m second and 8m seconds The digital input signal must have a duration greater than the selected debounce duration in order to be recognized as a valid input signal PMC Module Software Acromag provides a software product sold separately consisting of PMC module ActiveX Object Linking and Embedding drivers for Windows 2000 98 95 and Windows NT compatible application programs Model PMCSW ATX MSDOS format This software provides individual drivers that allow Acromag PMC modules to be easily integrated into Windows application programs such as Visual C Visual Basic Microsoft Office 97 applications and others The ActiveX controls provide a high level interface to PMC modules eliminating the need to perform low level reads writes of registers and the writing of interrupt handlers all the complicated details of programming are handled by the ActiveX controls These functions consist of an ActiveX control for each Acromag PM
110. ush convert signals to obtain the last converted data value from ADC Timed Periodic Trigger Circuit Timed Periodic Triggering is provided by two programmable counters an 8 bit Timer Prescaler and a 16 bit Conversion Timer The Timer Prescaler is clocked by the 8MHz board clock The output of the Timer Prescaler counter is then used to clock the second counter Conversion Timer In this way the two counters are cascaded to provide variable time periods anywhere from 10u seconds to 2 0889 seconds The output of the second counter is used to trigger the start of new ADC conversions for the Uniform Scan modes of operation For the Burst Continuous mode the interval between conversions of each channel is fixed at 15u seconds However the interval between the group burst of channels can be controlled by the Interval Timer ADC Memory Buffer Switch Control Two 512 sample memory buffers are provided in the FPGA logic to control simultaneous data acquisition and data reading via the PCI bus One memory buffer accepts new ADC data input samples along with a channel tag value The other memory buffer is available for data reading at PCI burst data rates over the PCI bus The Memory Threshold value is used to control transition between the two 512 sample memory buffers When the analog input memory buffer contains more samples then the Memory Threshold value the memory banks will switch See section 3 0 for programming details and use of the AD
111. ut or output select acquisition input mode select scan mode enable disable interrupts monitor the interrupt pending status and monitor memory status The function of each of the control register bits is described in Table 3 6 This register can be read or written with either 8 bit 16 bit or 32 bit data transfers A power up or system reset sets all control register bits to 0 Table 3 6 ADC Control Status Register FUNCTION description of each of these scan modes Output Data Format 0 Binary Two s Complement 1 Straight Binary See Tables 3 4 and 3 5 for a description of these two data formats External Trigger 00 11 Disabled 01 Input Active Low 10 Output Active Low It is possible to synchronize the data acquisition of multiple modules A single master module must be selected to output an external trigger signal while all other modules are selected to input the external trigger signal When enabled as an input the external trigger signal is provided via the ADC Trigger In pin Digital Channel 0 When enabled as an output the external trigger signal is provided via the ADC Trigger Out pin Digital Channel 8 Thus Digital Channel 0 or 8 if selected will not be available as a general digital channel When enabled here as an input digital channels 0 to 7 must be selected as input via the Digital I O Direction Control register When enabled as an output digital channels 8 to 15 will all
112. vide pseudo simultaneous sampling for many low to medium speed applications requiring simultaneous channel acquisition The 15u seconds between conversions of each channel can essentially be considered simultaneous sampling for low to medium frequency applications After software selection of the burst continuous mode of operation conversions are started either by an external trigger or by setting the software start convert bit If the external trigger is to be used bits 2 and 1 of the Control register must be set to 01 to accept the external trigger as an input signal Stopping the execution of burst continuous conversions is accomplished by writing 000 to the Scan Mode bits 10 8 of the ADC Control register See the ADC Control register section for additional information on the Scan Mode control bits and the ADC Control register board address location Interrupts can be enabled to go active when the Memory buffer contains more samples than the set threshold value The interrupt condition will remain set until interrupts are disabled or ADC data is read from the Memory ADC Burst Single Mode In burst single mode of operation conversions are performed once for all channels in sequential order for all channels enabled via the ADC Start End Channel Value registers The interval between conversions of each channel is fixed at 15u seconds The ADC Conversion Timer has no functionality in this mode of operation After software selection
113. y the DAC Conversion Timer or External Trigger rate To select this mode of operation bits 1 and 0 of the DAC Channel Control register must be set to digital code 11 Then issuing a software start convert or external trigger will start the data output cycles SERIES PMC730 PCI MEZZANINE CARD MULTIFUNCTION MODULE DAC Control Status Register Read Write Base 20H This read write register is used to enable single continuous or recycle mode conversions control external trigger mode enable disable DAC generated interrupts and monitor FIFO status The function of each of the control register bits is described in Table 3 9 This register can be read or written with either 8 bit 16 bit or 32 bit data transfers A power up or system reset sets all control register bits to 0 Table 3 9 DAC Control Status Register FUNCTION 00 Disable Conversions 01 Enable Single Conversion Mode A software start convert or external trigger is required for each conversion 10 Enable Continuous New Data Conversions 11 Enable Recycle Same Data Conversions Conversion are initiated via software start convert or external trigger In the Single Conversion mode of operation sample data is provided from the FIFO With each trigger the conversion of all eight DAC channels is possible Only those channels with new sample data will change All channels not updated with new sample data will maintain their last analog out

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