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1. Synchronizable Timecode Generator User Manual 7 13 Spectracom Corporation TPRO TSAT PCIU 2 66U 7 18 Programming the Heartbeat Output Not Applicable to HBIPPS FXA FXB LORI Options The heartbeat output P1 Pin 6 can be programmed to be either a pulse or a square wave The specified rate must be an exact multiple of 1 000 uS The range of programmable rates is Minimum Rate lowest frequency 44444444Hnen nennen nnnnnnnnnnnnnnnn nennen 21 845 mS 45 7771 Hz Maximum Rate highest frequency 1 000 uS 1 000 MHz Pulse Width time low pulse mode only 150 nS min 450 nS max negative polarity To specify the rate or frequency compute the divide number N as follows Note that N must be exactly divisible by 3 meaning that the specified period must be an exact multiple of 1 000 us To specify a period for a pulse or square wave compute N as N 3t 10 t is the period in seconds To specify a frequency for a pulse or square wave compute N as N 3 10 F F is the frequency in Hertz Not all values of N are acceptable Verify that the computed value is evenly divisible by 3 and that it is in the range of 3 to 65 535 inclusive Convert N into hexadecimal Base 16 notation For example if the desired output frequency is 10 kHz N 300 Base 10 converted to hexadecimal notation yields N 0x012c Send the hexadecimal number to the board by outputting the following sequence to the command
2. N 1000 F F is the frequency in Hertz Verify that the computed value is in the range of 2 to 65 534 inclusive Convert N into hexadecimal Base 16 notation For example if the desired output period is once every 25 seconds N 25 000 Base 10 converted to hexadecimal notation yields N 0x61a8 Send the hexadecimal number to the board by outputting the following sequence to the command register 0x00f0 Clear the Holding Register 0x00a6 0x00b1 0x00ca 0x00d8 specifies N 0x61a8 The heartbeat output can be programmed for a square wave or a pulse and can be programmed to start immediately or at the beginning of the next cycle Send one of the following commands to command port 0x00e5 Pulse mode starts at beginning of next cycle 0x00e6 Pulse mode starts immediately 0x00e7 Square wave starts at beginning of next cycle 0x00e8 Square wave starts immediately The heartbeat output is present regardless of whether the board is in sync or freewheeling The power on default is 1PPS pulse mode 7 20 Using the Time Tag Input When the rising edge of the Time Tag Input P1 Pin 4 occurs the clock time is latched into a temporary register and this register is then loaded into the FIFO An interrupt on the PCI bus is generated if enabled The user s software establishes that a time tag has occurred in one of two ways either by examining the least significant bit of the Status Register FIFO Ready flag to determine if it is a
3. 0x14 0 SYNC TCODE 0 Days_Hundreds 27 24 Days_Tens 23 20 Days_Ones 19 16 Hours_Tens 15 12 Hours_Ones 11 8 Minutes_Tens 7 4 Minutes_Ones 3 0 SYNC Set if clock is synced to Timecode or GPS and GPS positions is valid TCODE Set if Timecode input has a signal present For example The time is day 123 hour 11 minute 58 second 17 654321 SYNC 1 TCODE 1 The time is read as follows Location Contents Base 0x10 TIME_REG_LOW 0x17654321 Base 0x14 TIME_REG_HIGH Ox 61231158 8 5 Sending Commands Writing to the Command Port at Base 0x04 sends commands to the board A small delay is required after sending each word Note that there is no way to read back a command once it has been sent Commands consist of one or more 32 bit words of which only the lower 8 bits are actually used These lower 8 bits are further divided into two 4 bit nibbles For some commands the high nibble is a constant and the low nibble contains the data For other commands both the high and low nibbles are constant It is necessary to wait at least 100 uS after sending each command word before sending anything else to the command port 8 4 Synchronizable Timecode Generator User Manual TPRO TSAT PCILU 2 66U Spectracom Corporation Table 8 3 Command Functions Function Command Reset Firmware 0x0000004f Enable Sync 0x0000004d Di
4. 1 mS through Latches a snapshot of the present time and Base 0x0e i 1uS returns the lower portion of time Base 0x10 Clear Flags Clears interrupt flags Base 0x12 Simulate Time Tag Simulates a time tag occurrence H Reserved for future use 7 2 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 7 3 Using the FIFO The board uses a FIFO register to provide multi word responses Each of these responses consists of ten 16 bit words of which only the lower 8 bits are actually used A bit in the Status Register indicates whether data is ready in the FIFO The user s software must check that status bit before reading each word from the FIFO There can be a delay of up to 200 uS before all ten words are written into the FIFO This is due to the fact that although the on board CPU writes this data it also maintains the time days through milliseconds in software and places a higher priority on maintaining the time than on filling the FIFO Thus it is not uncommon that for example only three of the ten words are written into the FIFO then following a substantial delay the remaining seven words are written The user s software must allow for such operation i e it must not give up just because it has not read all ten words before the status indicates that the FIFO is empty Either wait 200 uS before beginning to read or allow for enough retries if FIFO empty status is detected pre
5. 2 66U 1 2 Your Spectracom GPS Receiver Your board s GPS receiver is built into the antenna housing and communicates to the board via a serial RS 422 interface Power 12V is supplied from the board The unit comes with a 100 foot cable Extension cables are available in 100 foot lengths The maximum total length is 500 feet The connectors on the extension cables are not weatherproof only the first 100 feet can be outdoors The cable consists of several twisted pairs not coaxial cable and a foil shield NOTE Spectracom recommends applying an appropriate silcon grease to the cable connection at the GPS antenna in order to protect the connection from moisture An additional weatherproofing kit P N 221213 containing butyl rubber and plastic tape is also available from Andrews Corporation US 800 255 1479 1 3 Distinguishing Between TPRO amp TSAT Boards Software Examine the Subsystem Product ID number that is detailed in the Specifications section 1 4 Inventory Before installing the board please verify that all material ordered has been received The TSAT is delivered with a 100 foot cable with pre installed connectors a GPS receiver antenna housed together in a single enclosure and a user manual The TPRO is delivered with mating connector 15 pin and a user manual If there is a discrepancy please contact Spectracom Customer Service at US 585 321 5800 1 5 Inspection and Support Unpack the equipment and insp
6. 8 10 Report Number of GPS Satellites Being Tracked TSAT Only eemseeenseenenneenennnennennnn 8 10 EnabIE BISaDlE SWING nee 8 11 Reading the SsawsRedisern ars ee real 8 11 Interrupt Control Port aus asian aa 8 12 Setting the Propagation Delay C freclion anu enneee erraten 8 13 Setting the Start Stop Match Times Not Applicable to Options FXA FXB or HDRV 8 13 Programming the Heartbeat Output Not Applicable to HB1PPS FXA FXB LOR1 Options nneeeeeeeeeeeeneneneneneennnennnennnn nn 8 14 Programming the Heartbeat Output For Options HB1PPS FXA FXB and LOR1 Only 8 15 USING hie Time Tag INDIE as 8 15 Report Fitmwate VERSION een area 8 17 PDO REP GA NER DT ee ee 8 17 Clear ads PUM een nen er eat ad 8 17 EAA EAE A E entered 8 19 Asser De assertRESet sa 8 19 OPTIONS AND ACCESSORIES 000000000000000000000000000000000000 9m OTi ONAE E ere tee mcr A A A E AE AR A E T een es 9 1 DELOBN Ce een eat une E a cerne veers rns 9 1 HBIPPS Cannot Be Combined with Options FXA FXB HDRV cccccssesesssssesssesssesssseeerees 9 1 FXA TSAT Only Cannot Be Combined with Options HB1PPS HDRV essiens 9 1 FXB TPRO Only Cannot Be Combined with Options HBIPPS HDRV sassen 9 1 FOR ee a n a A E A cers hcrmcnts 9 1 ZMATPRO DIN ae 9 2 ACCES SON ES re ner een ee 9 2 GPS Optic Isolators n e einer ee 9 2 GPS CD aa ee re ee CE A 9 2 DRIVER SUPPORT 50s505000J0 045000 ee 10 1 Synchronizable Timecode Generator
7. Clock is synced to timecode or GPS y 9 invalid and GPS position is valid 3 Match Flag Start time has not occurred Start time has occurred 4 Heartbeat Flag Heartbeat has not occurred Heartbeat has occurred 5 Heartbeat Int Mask PCI bus interrupt disabled for heartbeat PCI bus interruptoccursigneach heartbeat 6 Match Int Mask PCI bus interrupt disabled for start time ne interrupt occurs at thestar 7 FIFO Ready Int Mask PCI bus interrupt disabled for FIFO PCI bus interrupt occurs when FIFO data available data available 8 31 Reserved Reserved Reserved NOTE Bit 2 In Sync Flag is the only bit to examine when determining the validity of the time and position for TSAT Bit 1 Timecode Present is for diagnostic purposes only It indicates only that the amplitude of the timecode input is adequate for detection It does not indicate whether the input is valid For TSAT this bit will always be zero Synchronizable Timecode Generator User Manual 8 11 Spectracom Corporation TPRO TSAT PCIU 2 66U Bits 5 6 and 7 provide a means for reading back the corresponding bits in the Interrupt Control Port Bits 3 and 4 may be true 1 when power is first applied The user s software must clear bits 3 and 4 before using them 8 16 Interrupt Control Port The board can generate interrupts when the FIFO has data when each heartbeat occurs and or when the commanded Start Time occurs Each of these is enabled separately via the
8. FITNESS FOR A PARTICULAR PURPOSE Spectracom shall have no liability or responsibility to the original customer or any other party with respect to any liability loss or damage caused directly or indirectly by any Spectracom product material or software sold or provided by Spectracom replacement parts or units or services provided including but not limited to any interruption of service excess charges resulting from malfunctions of hardware or software loss of business or anticipatory profits resulting from the use or operation of the Spectracom product or software whatsoever or howsoever caused In no event shall Spectracom be liable for any direct indirect special or consequential damages whether the claims are grounded in contract tort including negligence or strict liability EXTENDED WARRANTY COVERAGE Extended warranties can be purchased for additional periods beyond the standard five year warranty Contact Spectracom no later than the last year of the standard fiveyear warranty for extended coverage SPECTRACOM 95 Methodist Hill Drive Rochester NY 14623 1 585 321 5800 FAX 1 585 321 5218 www spectracomcorp com sales spectracomcorp com This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a
9. Holding Register 0x00000051 0x00000062 0x00000073 Day 123 0x00000081 0x00000091 Hour 11 0x000000a5 0x000000b8 Minute 58 0x000000c1 0x000000d7 Second 17 NOTE If no timecode input is present TPRO or the GPS receiver is not tracking satellites TSAT the board will accept the time set sequence described above and continue to increment time freewheel However when a valid timecode TPRO is input or when the GPS receiver begins tracking satellites TSAT the clock s time will jump to the decoded time unless the above sequence was preceded with a Disable Sync command described later in this chapter While freewheeling the In Sync status bit will be false The user s software must ensure that the commanded values are in the appropriate ranges The board does not error check the data before loading the clock Commanding invalid values e g 39 hours causes erratic operation 8 6 Synchronizable Timecode Generator User Manual TPRO TSAT PCILU 2 66U Spectracom Corporation 8 7 Setting the Clock Time TPRO Option M Only Set the clock time by commanding the days hours minutes and seconds The milliseconds and microseconds cannot be commanded they are reset to 000000 when the next 1PPS occurs The clock time of the next 1PPS is commanded to the board It is necessary to load the time into the Holding Register First send a command to clear the Holding Register Then one at a time write each digit hundreds of d
10. Interrupt Control Port and any all or none can be enabled simultaneously The Interrupt Control Port is a single 32 bit word of which only 3 bits are actually used It is located at Base 0x00 and is write only The bits in the Interrupt Control Port are defined as shown in Table 7 5 Table 8 5 Interrupt Control Port Bit Definitions Bit Name Writing 0 Action Writing 1 Action 0 4 Reserved Reserved Reserved 5 Heartbeat Interrupt Mask No PCI interrupt on heartbeat Heartbeat causes PCI interrupt 6 Match Interrupt Mask No PCI interrupt at start time Start time causes PCI interrupt 7 FIFO Ready Int Mask No PCI interrupt when data is available in FIFO PCI interrupt when data is available in FIFO 8 31 Reserved Reserved Reserved The board generates the same interrupt regardless of whether it was caused by heartbeat start time or FIFO data available After an interrupt the user s software must interrogate the board to determine which of these was the cause The power on default is to have all interrupts disabled Also sending the Assert Reset command disables all interrupts CAUTION The FIFO Ready interrupt occurs each time the FIFO changes from being empty to containing data If the user s software detects quickly that the first word has been written into the FIFO and reads it out it is possible that the FIFO will be empty for a moment Thus when the second word
11. O instructions The locations of the board s registers are specified as Base Offset The offsets are constants as described in the next section The Base is chosen by the PCI BIOS during startup There is a separate Base for the memory and I O locations Time is read as two 32 bit words and is in binary coded decimal format Status is read as a single 32 bit word Time tags and for the TSAT GPS information longitude latitude altitude and Gregorian date are read by first sending a command to the board then reading ten 32 bit words from a first in first out FIFO register The user s software must wait a short amount of time after sending each command This admittedly cumbersome requirement is necessary because the on board processor places a higher priority on maintaining the time than on processing commands The actual amount of time needed to process a command depends on when the command was received relative to the on board time Entries in Chapter Six specify the amount of time needed to assure that the command was received There is no restriction on reading from the board Each 32 bit word is located on an even address Although many of the registers use only eight bits always read and write registers as 32 bit entities Do not attempt an 8 bit access on an odd address location Synchronizable Timecode Generator User Manual 8 Spectracom Corporation TPRO TSAT PCIU 2 66U 8 2 Register Locations NOTE In this m
12. Propagation Delay 10 uS in Holding Register 0x0010 19 Put Propagation Delay 10 uS in Holding Register 0x0000 09 Copy Holding Register to Clock Time or Propagation Time 0x00e0 Copy Holding Register to Start Stop Time Days Seconds 0x00e1 Copy Holding Register to Start Time 10 to 10 Seconds 0x00e2 Copy Holding Register to Stop Time 10 to 10 Seconds 0x00e3 Copy Holding Register to Clock Time on next 1PPS Option M only 0x004c Copy Holding Register to Heartbeat Pulse Mode at next period 0x00e5 Copy Holding Register to Heartbeat Pulse Mode immediately 0x00e6 Copy Holding Register to Heartbeat Square wave Mode at next period 0x00e7 Copy Holding Register to Heartbeat Square wave Mode immediately 0x00e8 Copy Holding Register to Year 0x00ea 7 6 Setting the Clock Time Not Applicable to Option M Set the clock time by commanding the days hours minutes and seconds The milliseconds and microseconds cannot be commanded they are reset to 000000 when the command is sent It is necessary to load the time into the Holding Register First send a command to clear the Holding Register Then one at a time write each digit hundreds of days down to ones of seconds into the Holding Register Synchronizable Timecode Generator User Manual 7 5 Spectracom Corporation TPRO TSAT PCIU 2 66U There is a separate command for loading each of these digits The upper 4 bits of the command identify which digit is being loaded the
13. TIME _REG_HIGH Reading the TIME _REG_LOW word latches both words thus the latency time between reading them does not affect the accuracy This also means that it is important to read TIME_REG_LOW first as this causes the other word to be latched It is not necessary to read both words if the application does not need the complete clock time NOTE These locations are read only A different sequence is used to set the time Refer to the sections on setting the clock time Reading TIME_REG_HIGH also returns 2 status flags SYNC amp TCODE All the status flags can also be read from the status register which requires an additional register read The Julian date not the Gregorian date is reported The value range for Days is 000 366 Be sure the variable that stores Days can accommodate this range Assigning Days to an 8 bit integer with a range of 000 255 produces an unpleasant surprise in mid September Synchronizable Timecode Generator User Manual 8 3 Spectracom Corporation TPRO TSAT PCIU 2 66U Within each 32 bit word there are eight nibbles groupings of 8 bits each Each nibble is decoded separately representing a single binary coded decimal Base 10 digit Table 8 2 Clock Time Data Location Nibble Nibble Nibble Nibble Base 0x10 Seconds_Tens 31 28 Seconds_Ones 27 24 Msec_Hundreds 23 20 Msec_Tens 19 16 Msec_Ones 15 12 Usec_Hundreds 11 8 Usec_Tens 7 4 Usec_Ones 3 0 Base
14. TPRO PCI FXB TPRO PCI LOR1 TPRO PCI M HB1PPS TPRO PCI DCLOBNC TSAT PCI TSAT PCI HB1PPS TSAT PCI FXA TSAT PCI DCLOBNC 0x10b5 0x9030 0x1347 0x9050 standard 0x9051 0x9052 0x9052 0x9052 0x9053 0x9050 0x9070 standard 0x9072 0x9072 0x9072 0x1AD7 0x9100 0x1AD7 0x9150 standard 0x9151 0x9152 0x9152 0x9152 0x9153 0x9150 0x9170 standard 0x9172 0x9172 0x9172 Table 2 8 General Specifications Size H 106 7 mm L 174 6 mm H 4 2 L 6 875 Power from PCI bus 5 VDC 425 mA max 12 VDC 225 mA max 12 VDC 50 mA max Operating Temperature 30 to 70 C 22 to 158 F Storage Temperature 40 to 80 C 40 to 176 F Connectors BNCs for timecode input and output DB15 socket for timecode input output heartbeat output match output time tag input and 1 PPS input Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation Table 2 9 Heartbeat Output Specifications 3 8 V min at 6 mA high Output Voltage 0 4 V max at 6 mA low Wave Shape Pulse or Square Wave programmable Pulse Width 150 nS min 450 nS max Pulse Polarity Negative 45 55 Square Wave Timing Falling edge on time pulse or square wave 1 000 uS 21 845 mS in 1 uS steps 1 MHz 45 7771 Hz 100 PPS pulse Range Power on default rate 2 2 TSAT GPS Receiver Only N
15. TPRO requires that the year be set by command at the end of a leap year The board will increment the year when the day rolls over to 001 Also setting the year enables the board TPRO and TSAT to compute the Gregorian date using the year and Julian date Set the year by sending the command sequence 0x006n 0x007n 0x008n 0x009n 0x00ea to the command port For example to set the year to 2003 send 0x0062 0x0070 0x0080 0x0093 0x00ea The year is reset to 0000 when power is first applied or when any of the following occur system reset firmware reset command 0x004f or writing to the Assert Reset or De assert Reset addresses 7 9 Reading the Year Gregorian Date and Altitude Not Applicable to Option M The GPS receiver s computations for the altitude TSAT only and Gregorian date TSAT and TPRO are reported in the FIFO in response to the 0x005d command Altitude is in units of meters relative to mean sea level Word Bits 7 4 Bits 3 0 0 first 5 D 1 5 D 2 10 Day 10 Day 3 10 meters 10 meters 4 10 meters 10 meters 5 10 meters 10 meters 6 10 meters 0 7 10 Year 10 Year 8 10 Year 10 Year 9 last 10 Month 10 Month 7 8 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation The board increments the Gregorian date approximately one second after time rolls over from 23 59 59 to 00 00 00 HH MM SS This occurs
16. The milliseconds and microseconds cannot be commanded they are reset to 000000 when the next 1PPS occurs The clock time of the next 1PPS is commanded to the board It is necessary to load the time into the Holding Register First send a command to clear the Holding Register Then one at a time write each digit hundreds of days down to ones of seconds into the Holding Register There is a separate command for loading each of these digits The upper 4 bits of the command identify which digit is being loaded the lower 4 bits contain the actual data to load Once all the digits have been loaded a command is sent to arm the clock For example to set the clock to day 123 hour 11 minute 58 second 17 send the following sequence of commands to the Command Port 0x00f0 Clear the Holding Register 0x0051 0x0062 0x0073 Day 123 0x0081 0x0091 Hour 11 0x00a5 0x00b8 Minute 58 0x00c1 0x0047 Second 17 0x004c Arm the clock for next 1PPS After sending the 0x004c command the board sets the milliseconds and microseconds to 000000 when the first 1PPS occurs the seconds do not increment Then on the second 1PPS pulse the time seconds begins to increment CAUTION The board expects the 1PPS input to be continuous If the 1PPS signal stops pulsing after the board establishes initial sync the board will continue to increment time freewheel However if the 1PPS signal resumes after a period of freewheeling the board may rese
17. appropriate bit of this register at location Base 0x10 Table 8 7 Interrupt Control Port Bit Definitions Bit Name Writing 0 Action Writing 1 Action 0 2 Reserved Reserved Reserved Synchronizable Timecode Generator User Manual 8 17 Spectracom Corporation TPRO TSAT PCIU 2 66U Table 8 7 Interrupt Control Port Bit Definitions 3 Clear Match Match flag does not change Clear match flag to zero 4 Clear Heartbeat Heartbeat flag does not change Clear heartbeat flag to zero 5 31 Reserved Reserved Reserved NOTE If used as an interrupt the user s software must clear the Match Flag each time the Start time occurs Failure to do so will result in missed interrupts if enabled until the flag is cleared If used as an interrupt the user s software must be fast enough to clear the Heartbeat Flag each time a heartbeat occurs Failure to do so will result in missed interrupts if enabled until the flag is cleared 8 18 Synchronizable Timecode Generator User Manual TPRO TSAT PCILU 2 66U Spectracom Corporation 8 25 Reset Firmware CAUTION This command is for diagnostic purposes only It should not be used during normal operation Writing 0x0000004f to the command port causes the embedded firmware to reset This command does not reset the hardware or the PCI bus interface Wait at least eight seconds after sending this command before commanding or interrogatin
18. commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense TPRO TSAT PCIU 2 66U Spectracom Corporation 7 10 7 11 7 12 7 13 7 14 7 15 7 16 1 17 7 18 Table of Contents OVERVIEW oo 00000000000000000000000000000000000000000000000000 1 a 1 General Information about GPS nee ea 1 1 VOUFSPeCHeCOM GP s RECENGE cima nee 1 2 Distinguishing Between TPRO amp TSAT Boards Software ssesesenenenensenenenenenennnnnennenenennnnenn 1 2 VENON een et ae 1 2 Inspection and SUPROT an ne een in 1 2 SPECIFICATIONS 000000000000000000000000000000000000000000000000006 2 1 DER O Board OR en R LEEA E A T 2 1 TSAT GPS RB OCONEE OH Year 2 3 PINOUTS 00000000000000000000000000000000000000000000000000000006000600000 I Connector Pinout TSAT One eilt 3 1 P1 Connector Pinout TPR O Only esse rue 3 2 Time Code Input BNC Connector J Teaser 3 3 IRIG B Output BNC Connector J 2 ansehe 3 3 CONFIGURATION 00000000000000000000000000000000000000600000006000000 1 Base Address a nennen 4 1 interrupt Reguest levels a een vista tance ti aaadeunared eared 1a 4 1 PCI U 2 66MHz J umper Configur
19. connector In addition some pins may interface to the user s equipment It is the user s responsibility to modify the antenna cable connector if necessary to access the User Connection pins A description of the pinout for the supplied cable is shown in Table 3 1 Refer to the figure on the following page Table 3 1 TSAT P1 Connector Pinout P1 Pin Antenna Pin Antenna Connection Wire Color User Connection 1 Do not connect 2 Do not connect 3 1 12 Volts Red 4 Time Tag input 5 9 Ground Black Ground 6 Heartbeat output 7 Ground Shield 8 Match time output 9 11 1PPS Orange White 10 5 RXD Yellow 11 4 RXD Brown 12 3 TXD Orange 13 2 TXD Violet 14 12 1PPS Black White 15 8 Battery Green Synchronizable Timecode Generator User Manual 3 1 Spectracom Corporation TPRO TSAT PCIU 2 66U The antenna cable wires are twisted pairs as follows Red with Black sciiicctcasitesuscnceranctibeceagiterl Pins 3 and 5 Orange with Violet 2 ur 40 Pins 12 and 13 Yellow with Brown uueeeessssnseeennnenenn Pins 10 and 11 Green with Blue u Pins 15 and None Orange White with Black White Pins 9 and 14 NOTE The following antenna cable wires are connected at the antenna end but NOT at P1 Antenna Pin Color 6 White 7 Gray 10 Bl
20. lower 4 bits contain the actual data to load Once all the digits have been loaded a command is sent to set the time the board does this by copying the Holding Register into the clock For example to set the clock to day 123 hour 11 minute 58 second 17 send the following sequence of commands to the Command Port Ox00f0 Clear the Holding Register 0x0051 0x0062 0x0073 Day 123 0x0081 0x0091 Hour 11 0x00a5 0x00b8 Minute 58 0x00c1 0x0047 Second 17 0x00e0 Set Clock Time NOTE If no timecode input is present TPRO or the GPS receiver is not tracking satellites TSAT the board will accept the time set sequence described above and continue to increment time freewheel However when a valid timecode TPRO is input or when the GPS receiver begins tracking satellites TSAT the clock s time will jump to the decoded time unless the above sequence was preceded with a Disable Sync command described later in this chapter While freewheeling the In Sync status bit will be false The user s software must ensure that the commanded values are in the appropriate ranges The board does not error check the data before loading the clock Commanding invalid values e g 39 hours causes erratic operation 7 Synchronizable Timecode Generator User Manual TPRO TSAT PCILU 2 66U Spectracom Corporation 7 7 Setting the Clock Time TPRO Option M Only Set the clock time by commanding the days hours minutes and seconds
21. name changed to PCI U 2 Minor corrections Spectracom Corporation 95 Methodist Hill Drive Rochester NY 14623 www spectracomcorp com Phone US 1 585 321 5800 Fax US 1 585 321 5219
22. only this status bit will always be set No serial data being received from GPS satellite GPS satellite receiver serial data being received receiver In applications with modulated OK timecode inputs only this status bit will always be set GPS satellite receiver is not tracking enough GPS satellite receiver is tracking enough satellites for accurate UTC time In applications satellites for accurate UTC time with modulated timecode inputs only this status bit will always be set Timecode input not decodable In applications Timecode input being decoded without modulated timecode inputs this status bit will always be set If using 1PPS set NEXT 1PPS TIME command sequence has been performed Used for Option M only Waiting for SET NEXT 1PPS TIME command Used for Option M only 5 2 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 6 Board Operation 6 1 TSAT The TSAT acquires time from the GPS satellites synchronizes its on board clock to this time and provides an IRIG B output from the on board clock NOTE When IRIG and GPS are connected simultaneously the unit defaults to IRIG synchronization GPS consists of a set constellation of approximately 30 These satellites are in relatively high circular orbits are inclined about 55 degrees relative to the equator and circle the Earth approximately once every 12 hours Consequently several satellites are abo
23. satellites be tracked The In Sync flag in the Status Register must be used to actually determine whether the board is synchronized and providing valid position 7 10 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation There is no difference in timing accuracy when 5 6 7 or 8 satellites are being tracked It is normal for the number to fluctuate between 5 and 8 given that the GPS receiver picks different satellites to optimize the timing It is normal for the number of satellites to be between O and 3 during acquisition and re acquisition 7 13 Enable Disable Sync The board can be forced to freewheel by sending the Disable Sync command Sending this command causes the board to ignore the timecode input the 1PPS input Option M only and the GPS input TSAT only To restore normal operation send the Enable Sync command To send the Disable Sync command write 0x004e to the command port To send the Enable Sync command write 0x004d to the command port The power on default is to Enable Sync 7 14 Reading the Status Register The Status Register consists of one 16 bit word of which only the lower 8 bits are used The Status Register is read from location Base 0x02 and is formatted as shown in Table 7 4 Table 7 4 Status Register Format Bit Name Meaning When 0 Meaning When 1 ee FIFO Ready Flag FIFO Ready data availabl
24. sure the variable that stores Days can accommodate this range Assigning Days to an 8 bit integer with a range of 000 255 produces an unpleasant surprise in mid September Within each 16 bit word there are four nibbles groupings of 4 bits each Each nibble is decoded separately representing a single binary coded decimal Base 10 digit Synchronizable Timecode Generator User Manual 73 Spectracom Corporation TPRO TSAT PCIU 2 66U Table 7 2 Clock Time Data Location Most Significant Nibble Nibble Nibble Lease Significant Nibble Base Ox0e 10 mS 10 uS 10 us 10 us Base Ox0c 10 Seconds 10 Seconds 10 mS 10 mS Base Ox0a 10 Hours 10 Hours 10 Minutes 10 Minutes Base 0x08 Reserved 10 Days 10 Days 10 Days For example if the time is day 123 hour 11 minute 58 second 17 654321 the time is read as follows Location Contents Base 0x0e 0x4321 Base 0x0c 0x1765 Base 0x0a 0x1158 Base 0x08 0xU123 U Unknown 7 5 Sending Commands Writing to the Command Port at Base 0x02 sends commands to the board A small delay is required after sending each word Note that there is no way to read back a command once it has been sent Commands consist of one or more 16 bit words of which only the lower 8 bits are actually used These lower 8 bits are further divided into two 4 bit nibbles For some commands the high nibble is a constant and the low nibble conta
25. through configuration is that if the signal is lost at some point all boards downstream of the break continue to have the same time driven by the first board s freewheeling clock Also it eliminates the need for BNC T connectors The board synchronizes to the incoming timecode automatically An on board 10 MHz crystal oscillator is phase locked to the timecode carrier frequency This results in timing resolution down to 1uS despite the fact that the input carrier is only 1 kHz or 10 kHz for IRIG A Also this precludes using timecode from sources with unstable time bases e g playback from tape or digital storage By definition the timecode format standard IRIG B NASA36 or IRIG A specifies that the format for transmitting the date be an integer 001 366 This is referred to as the Julian date Note that the date is not in year month day as in Gregorian format NOTE Although the user s software can convert from a Julian date to a Gregorian date be careful First the user s software must distinguish whether or not the current year is a leap year Second the user s software must account for the fact that when freewheeling before synchronizing the board will report an invalid Julian date 000 6 2 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 7 Programming for TPRO TSAT U 2 7 1 General Information From a programming standpoint the board appears to be a PCI to ISA bridge de
26. Corporation 7 21 Report Firmware Version The version of the embedded firmware is reported in the FIFO in response to the Ox00e9 command For example firmware version 7A104221 is reported as shown below Word Bits 7 4 Bits 3 0 0 first E 9 1 E 9 2 7 A 3 1 0 4 4 2 5 2 1 6 Unknown Unknown 7 Unknown Unknown 8 Unknown Unknown 9 last Unknown Unknown NOTE The Firmware version is for diagnostic purposes only It is not possible to determine 7 22 which options are present or which version is more recent by examining the version number The firmware version is also printed on the label on device U19 Some older boards ignore the Ox00e9 command Clear Flags Port Once the Match and or Heartbeat flag s get set it is necessary to clear the flag by writing a 1 to the appropriate bit of this register at location Base 0x10 Table 7 6 Interrupt Control Port Bit Definitions Bit Name Writing 0 Action Writing 1 Action 0 2 Reserved Reserved Reserved 3 Clear Match Match flag does not change Clear match flag to zero 4 Clear Heartbeat Heartbeat flag does not change Clear heartbeat flag to zero 5 15 Reserved Reserved Reserved NOTE If used as an interrupt the user s software must clear the Match Flag each time the Start time occurs Failure to do so will result in missed interrupts if enabled until the fl
27. OTE When both IRIG and GPS synchronization sources are connected simultaneously the unit will default to IRIG decoding Table 2 10 GPS Receiver Antenna Specifications Number of Satellites 6 Acquisition Time cold start 1 minutes typical Re acquisition Time lt 1 minute L1 frequency C A code SPS continuous Frequency tracking receiver static overdetermined clock mode default Sync to UTC Within 15 nanoseconds static Accuracy Horizontal Position lt 6 meters 50 lt 9 meters 90 Accuracy Altitude Position lt 11 meters 50 lt 18 meters 90 Altitude 0 m to 18 000 m 0 to 59 055 feet Size 3 74 D 2 85 H 95mm x 72 5mm Weight 5 4 oz 154 g Pole Mount 1 14 straight thread or 3 4 pipe thread Operating Temp 40 to 85 C 40 to 185 F Storage Temp 55 to 105 C 67 to 221 F Operating Humidity 95 RH non condensing 60 F Synchronizable Timecode Generator User Manual 2 3 Spectracom Corporation TPRO TSAT PCIU 2 66U 2 4 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 3 Pinouts The accompanying figure illustrates pinouts for both the TSAT PCI and the TPRO PCI P1 DB15 Connector Top Row L R 8 7 6 5 4 3 2 1 NZ po 7 n RED LED ren ma 3 1 Connector Pinout TSAT Only The GPS receiver antenna cable plugs into the 15 pin P1
28. Report Longitude TSAT Only The GPS receiver s computation for longitude is put into the FIFO in response to the 0x005e command The units are degrees minutes and fractions of minutes The response is in the following format Word Bits 7 4 Bits 3 0 0 first 5 e 1 5 e 2 0 10 Degrees 3 10 Degrees 10 Degrees 4 10 Minutes 10 Minutes 5 10 Minutes 107 Minutes 6 10 Minutes 10 Minutes 7 Reserved Reserved 8 Reserved Reserved 9 last Reserved Reserved NOTE If the reported value is less than 180 degrees the longitude is East for Europe Africa Asia etc If the reported value is greater than or equal to 180 degrees subtract 180 degrees to obtain west longitude for USA Canada Central amp South America etc For example the reported value for Los Angeles CA USA will be approximately 298 degrees Since this is greater than 180 subtract 180 to get the correct value i e 118 degrees West Be sure to convert minutes to decimal degrees before comparing to 180 degrees Synchronizable Timecode Generator User Manual 89 TPRO TSAT PCIU 2 66U Spectracom Corporation 8 11 Report Latitude TSAT Only The GPS receiver s computation for latitude is put into the FIFO in response to the 0x005f command The units are degrees minutes and fractional minutes Latitudes north of the equator are reported as 0 90 degrees latitudes south of the equator are reported as 180 degre
29. S FXA FXB LOR1 Options uneeessssenneseeeneennenenennnnnnenenennn 7 14 Synchronizable Timecode Generator User Manual iii Spectracom Corporation TPRO TSAT PCIU 2 66U 7 19 7 20 7 21 7 22 7 23 7 24 8 8 1 8 2 8 3 8 4 8 5 8 6 8 7 8 8 8 9 8 10 8 11 8 12 8 13 8 14 8 15 8 16 8 17 8 18 8 19 8 20 8 21 8 22 8 23 8 24 8 25 8 26 9 9 1 9 1 1 9 1 2 9 1 3 9 1 4 9 1 5 9 1 6 9 2 9 2 1 9 2 2 10 Programming the Heartbeat Output For Options HB1PPS FXA FXB and LOR1 Only 7 15 USING Hie Tie Tag INDU ae anne erden 7 15 Report Firmware NV EBSION 2 ei 7 17 Clear Flags Por nee 7 17 Reset RIMM ONG nee endende 7 18 ASSQRUD BeaS SEM RESEE A ee et 7 18 PROGRAMMING THE TPRO TSAT G6U ccccccccccccccccccccccee B I general Information crsa een ee 8 1 PROOISTO RO CAMONS re ee ee einen A ctanat ali 8 2 Using the FIF OR gece ttle eee er a eier 8 3 Reading C lock Nee ee 8 3 Sending Commands zes ae ahh tea nce ov deers Saal a ATO a 8 4 Setting the Clock Time Not Applicable to Option M neeseenenneneeeneeneneenenennnnnennennennnn 8 5 Setting the Clock Time TP RO Option M Only ae 8 7 Setting the Year Not Applicable to Option M neseneseseneesenenennennennnenennennnnnnnnennnnennnnennnnnenennannone 8 8 Reading the Year Gregorian Date and Altitude Not Applicable to Option M neseser 8 8 Report Longitude TS AT ON N er aa nania abst nog 8 9 Report Latitude TSAT ONIY air A een 8 10 ee eier
30. Synchronizable Timecode Generator User Manual 3 3 Spectracom Corporation TPRO TSAT PCIU 2 66U 34 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 4 Configuration 4 1 Base Address The host computer s PCI BIOS software configures the base address 4 2 Interrupt Request Level The host computer s PCI BIOS software configures the interrupt request IRQ level 4 3 PCI U 2 66MHz Jumper Configuration 121212 O 1 fran JPifeelle elec JP4 T fe elle elle e ale JP 59696 56 JP9 TPRO DIP SETTING SW1 1 2 3 4 Standard ON ON ON ON 1 3 2 4 1 3 2 4 M OFF ON ON ON HB1PPS ON OFF ON ON FXB OFF OFF ON ON LOR1 ON ON OFF ON M HB1PPS OFF ON OFF ON DCLOBNC ON OFF OFF ON Standard OFF OFF OFF ON HB1PPS ON ON ON OFF FXA OFF ON ON OFF DCLOBNC ON OFF ON OFF LOR1 OFF OFF ON OFF Option M does not support IRIG A synchronization Synchronizable Timecode Generator User Manual Spectracom Corporation 4 2 TPRO TSAT PCIU 2 66U Synchronizable Timecode Generator User Manual TPRO TSAT PCILU 2 66U Spectracom Corporation 5 Installation 5 1 GPS Receiver Antenna TSAT Only The mounting location should be free of objects that could obstruct satellite visibility from straight overhead to within 20 degrees of the horizon in all directions Obstructions that block a significant portion of the sky
31. TPRO TSAT PCI U 2 66U SYNCHRONIZABLE TIMECODE GENERATOR with UNIVERSAL PCI BUS INTERFACE User Manual 95 Methodist Hill Drive Rochester NY 14623 Phone US 1 585 321 5800 Fax US 1 585 321 5219 www spectracomcorp com Part Number 1186 500 1 0050 Manual Revision D 24 April 2009 Copyright 2009 Spectracom Corporation The contents of this publication may not be reproduced in any form without the written permission of Spectracom Corporation Printed in USA Specifications subject to change or improvement without notice Spectracom NetClock Ageless TimeGuard TimeBurst TimeTap LineTap MultiTap Versalap and Legally Traceable Time are Spectracom registered trademarks All other products are identified by trademarks of their respective companies or organizations All rights reserved SPECTRACOM LIMITED WARRANTY LIMITED WARRANTY Spectracom warrants each new product manufactured and sold by it to be free from defects in software material workmanship and construction except for batteries fuses or other material normally consumed in operation that may be contained therein AND AS NOTED BELOW for five years after shipment to the original purchaser which period is referred to as the warranty period This warranty shall not apply if the product is used contrary to the instructions in its manual or is otherwise subjected to misuse abnormal operations accident lightning or transient surge repairs or modific
32. Time on next 1PPS Option M only 0x0000004c Copy Holding Register to Heartbeat Pulse Mode at next period 0x000000e5 Copy Holding Register to Heartbeat Pulse Mode immediately 0x000000e6 Copy Holding Register to Heartbeat Square wave Mode at next period 0x000000e7 Copy Holding Register to Heartbeat Square wave Mode immediately 0x000000e8 Copy Holding Register to Year 0x000000ea 8 6 Setting the Clock Time Not Applicable to Option M Set the clock time by commanding the days hours minutes and seconds The milliseconds and microseconds cannot be commanded they are reset to 000000 when the command is sent It is necessary to load the time into the Holding Register First send a command to clear the Holding Register Then one at a time write each digit hundreds of days down to ones of seconds into the Holding Register Synchronizable Timecode Generator User Manual 8 5 Spectracom Corporation TPRO TSAT PCIU 2 66U There is a separate command for loading each of these digits The upper 4 bits of the command identify which digit is being loaded the lower 4 bits contain the actual data to load Once all the digits have been loaded a command is sent to set the time the board does this by copying the Holding Register into the clock For example to set the clock to day 123 hour 11 minute 58 second 17 send the following sequence of commands to the Command Port 0x000000e0 Set Clock Time 0x000000 0 Clear the
33. User Manual TPRO TSAT PCIU 2 66U Spectracom Corporation I Overview This manual provides comprehensive information on the system architecture specifications and operation of the Spectracom TPRO and TSAT Synchronizable Time Code Generators with Universal PCI Bus Interface The TPRO is a precision clock that synchronizes automatically to standardized timecode signals or for the TSAT configuration to the GPS satellite system and can be read from the PC host computer Inputs to the TPRO are modulated timecode or for the TSAT GPS receiver signals host commands and time tags Outputs are modulated IRIG B timecode programmable start stop time and a programmable heartbeat pulse rate The board can generate interrupts on the universal PCI bus if enabled Interrupt sources include the heartbeat time tag FIFO data available and at the programmable start time The clock automatically synchronizes to specified timecode signals A status bit advises the host of synchronization status In the absence of timecode input or GPS the board starts counting at 000 days 00 hours 00 minutes 00 seconds at power on The clock time can also be set by user command 1 1 General Information about GPS NOTE GPS applies only to the TSAT board The TPRO is not equipped for GPS The United States government operates a set of approximately 32 satellites collectively known as the GPS Constellation or GPS Satellites Each satellite has an
34. able 2 3 Time Tag Input Specifications 0 5V min 0 8V max for logic 0 Input Voltage 2 0V min 5 5 max for logic 1 Tags rising edge lt 5 uA for logic 0 Input Current lt 5 wA for logic 1 Rise Fall Time 500 nS max Repetition Rate 1000 events per second max Timing Resolution 1us Table 2 4 1 PPS Sync Input Specifications Option M Only 2 4 V min 16 0 V max high Input Voltage 500 pA max at 5 Vin 12 mA max at 16 Vin Rise Fall Time 500 nS max Trigger Edge Rising pps Accuracy Must be 100 ppm or better H One pulse per second Synchronizable Timecode Generator User Manual 2 Spectracom Corporation 22 TPRO TSAT PCEU 2 66U Table 2 5 Match Output Specifications 3 8 V min at 6 mA high Output Voltage 0 4 V max at 6 mA low Setability 1 uS Table 2 6 On board Clock Specifications Resolution 1uS Range 366 23 59 59 999999 Date Format Integer 001 366 Synchronization Time lt 8 seconds ss Disciplined to timecode 1x10 Stability Undisciplined 2x107 Table 2 7 PCI Interface Specifications Model PCI U 2 PCI 66U Interface PCI Spec 2 2 compliant Bus Speed 33MHz 33 66MHz VO 64 bytes DMA Transfers None General Occupies 32 consecutive 16 bit I O and memory addresses 64 bytes Chipset Vendor ID Chipset Product ID Subsystem Vendor ID Subsystem Product ID TPRO PCI TPRO PCI M TPRO PCI HB1PPS
35. ag is cleared If used as an interrupt the user s software must be fast enough to clear the Heartbeat Flag each time a heartbeat occurs Failure to do so will result in missed interrupts if enabled until the flag is cleared Synchronizable Timecode Generator User Manual 7 17 Spectracom Corporation TPRO TSAT PCIU 2 66U 7 23 Reset Firmware CAUTION This command is for diagnostic purposes only It should not be used during normal operation Writing Ox004f to the command port causes the embedded firmware to reset This command does not reset the hardware or the PCI bus interface Wait at least eight seconds after sending this command before commanding or interrogating the board 7 24 Assert De assert Reset These commands are for diagnostic purposes only Sending the Assert Reset command holds the hardware reset signal on the board in the asserted state This stops the on board CPU and clears the interrupt masks and Match and Heartbeat Flags The only command that the board will respond to in this state is the De assert Reset command The PCI bus interface is not affected Send the Assert Reset command by writing any data value to location Base 0x06 Send the De assert Reset command by writing any data value to location Base 0x04 Wait at least eight seconds after sending the De assert Reset command before commanding or interrogating the board NOTE After the Assert Reset command is sent the diagnostic light on the rear panel
36. an 50 mS after the previous 1PPS occurred and no later than 50 mS before the next arming 1PPS occurs Synchronizable Timecode Generator User Manual 8 7 Spectracom Corporation TPRO TSAT PCIU 2 66U NOTE If both 1PPS and Timecode inputs are present the board will sync to the incoming timecode and ignore the 1PPS IRIG A is not supported when this option is enabled Commands 0x0000004d and 0x0000004e Enable Disable Sync apply both to the 1PPS and the timecode input Commands 0x000000e0 set clock and 0x000000ea set year are not applicable to boards with Option M The user s software must ensure that the commanded values are in the appropriate ranges The board does not error check the data before loading the clock Commanding invalid values e g 39 hours will cause erratic operation 8 8 Setting the Year Not Applicable to Option M Whether the IRIG B output is synchronized to GPS or timecode or is freewheeling it counts from day 365 to day 001 unless the year is set to a leap year Once set to a leap year the IRIG B output counts from 365 to 366 then to 001 The TSAT acquires the year from the GPS satellites The year can also be set by command if the GPS receiver is not connected To function properly the TPRO requires that the year be set by command at the end of a leap year The board will increment the year when the day rolls over to 001 Also setting the year enables the board TPRO and TSAT to compute th
37. anual the prefix Ox indicates that the number is in hexadecimal Base 16 format Table 8 1 Register Locations for TPRO TSAT 66U Location Read Usage Write Usage Register Function R Returns response data from the board Base 0x00 FIFO Interrupt Control Port F W Interrupt control register R Returns status information for the board Base 0x04 Status Register Command Port W Issues commands to the board Base 0x08 De assert Reset Releases the board from reset Assert Reset Places the board into reset Base 0x10 TIME REG LOW H Latches a snapshot of the present time and returns the lower portion of time Base 0x14 TIME REG HIGH H Returns upper portion of latched time and Status info Base 0x18 Clear Flags Clears interrupt flags Simulate Time Tag Simulates a time tag occurrence Base 0x20 FPGA_REV Returns FPGA revision H Reserved for future use 8 2 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 8 3 Using the FIFO The board uses a FIFO register to provide multi word responses Each of these responses consists of ten 32 bit words of which only the lower 8 bits are actually used A bit in the Status Register indicates whether data is ready in the FIFO The user s software must check that status bit before reading each word from the FIFO There can be a delay of up to 200 uS before all ten words are written into the FIFO This is due to the fact that alt
38. are degrees minutes and fractional minutes Latitudes north of the equator are reported as 0 90 degrees latitudes south of the equator are reported as 180 degrees South i e if the reported value is greater than or equal to 180 subtract 180 degrees and change the sign to negative south It is important to convert minutes to decimal degrees before comparing to 180 degrees The response is in the format shown here 7 12 Report Number of GPS Satellites Being Tracked TSAT Only The GPS receiver determines automatically which satellites to track The number quantity of satellites being tracked is reported in the FIFO in response to sending command 0x005c to the Word Bits 7 4 Bits 3 0 0 first 5 f 1 5 f 2 0 10 Degrees 3 10 Degrees 10 Degrees 4 10 Minutes 10 Minutes 5 10 Minutes 10 Minutes 6 10 Minutes 10 Minutes 7 Reserved Reserved 8 Reserved Reserved 9 last Reserved Reserved command port The response is of the form shown here Word Bits 7 4 Bits 3 0 0 first 5 c 1 5 c 2 Reserved Reserved 3 Reserved Reserved 4 Reserved Reserved 5 Reserved Reserved 6 Reserved Reserved 7 0 of Satellites 8 Reserved Reserved 9 last Reserved Reserved NOTE The number of satellites tracked is for diagnostic purposes only The number of satellites ranges from 0 to 8 inclusive Valid time and position require that at least four
39. ation x ettentvvedsaveneridicnerstaateaasacationuentvmvcucidenatdeuctraconanieabuntuertant 4 1 INSTALLATION 00000000000000000000000000000000000000000000000600000066 D GPS Receiver Antenna TSAT On une 5 1 Installing the Board in the Computer era 5 1 BOARD OPERATION 00000000000000000000000000000000000000006000060060 61 TOR a cet A E A E O E A 6 1 TERO see A E et 6 2 PROGRAMMING FOR TPRO TSAT U 2 cccccccccccccccccccccccee General Iniormalongzs seele 7 1 Reg TER LOGAN ee ee nee lage 7 2 USIMGS OL IE Oca teen eigenen au 7 3 Reading Clock Tine eek 7 3 Sending Commands east akt 7 4 Setting the Clock Time Not Applicable to Option M neeeeeeeeeneeennenenneennnnnnnnnennne en 7 5 Setting the Clock Time TPRO Option M Only anne a 7 7 Setting the Year Not Applicable to Option M eseessseneeeneneneennenennennennnnennenenennennnnnnennannon 7 8 Reading the Year Gregorian Date and Altitude Not Applicable to Option M nenne 7 8 Report Longitude SAT One 7 9 Report Lattude SAT One essen 7 10 Report Number of GPS Satellites Being Tracked TSAT Only ueeeesesesseseseeeneenenenenenennnennenn 7 10 Enable Disable Sync Reese are 7 11 Reading thie S tat s Rh COIS ers air aeg 7 11 interr pt Control Por onen Brei Ri 7 12 Setting the Propagation Delay Correction an aan 7 13 Setting the Start Stop Match Times Not Applicable to Options FXA FXB or HDRV 7 13 Programming the Heartbeat Output Not Applicable to HB1P P
40. ations not performed by Spectracom The GPS receiver is warranted for one year from date of shipment and subject to the exceptions listed above The power adaptor if supplied is warranted for one year from date of shipment and subject to the exceptions listed above THE ANALOG CLOCKS ARE WARRANTED FOR ONE YEAR FROM DATE OF SHIPMENT AND SUBJECT TO THE EXCEPTIONS LISTED ABOVE THE TIMECODE READER GENERATORS ARE WARRANTED FOR ONE YEAR FROM DATE OF SHIPMENT AND SUBJECT TO THE EXCEPTIONS LISTED ABOVE The Rubidium oscillator if supplied is warranted for two years from date of shipment and subject to the exceptions listed above All other items and pieces of equipment not specified above including the antenna unit antenna surge suppressor and antenna preamplifier are warranted for 5 years subject to the exceptions listed above WARRANTY CLAIMS Spectracom s obligation under this warranty is limited to infactory service and repair at Spectracom s option of the product or the component thereof which is found to be defective If in Spectracom s judgment the defective condition in a Spectracom product is for a cause listed above for which Spectracom is not responsible Spectracom will make the repairs or replacement of components and charge its then current price which buyer agrees to pay Spectracom shall not have any warranty obligations if the procedure for warranty claims is not followed Users must notify Spectracom
41. automatically begins to search for GPS satellite signals After the receiver has been operating for a few minutes and has calculated the position longitude latitude and altitude it saves the position in memory A saved position results in faster re acquisition the next time power is applied A large capacitor on the board provides voltage to the receiver s memory if the cable between the board and the receiver is disconnected or if the computer has not been turned on in approximately the past 10 days the receiver s position memory is lost Therefore a slightly longer acquisition time is required the next time that power is applied The time obtained is in Coordinated Universal Time UTC format This means the same time and date is received in all parts of the world regardless of local time zone UTC is 5 hours ahead of Eastern Standard Time EST in the United States in winter and 4 hours ahead of Eastern Daylight Time EDT in summer UTC is not adjusted for Daylight Saving time for example 10 00 p m in New York City on July 3rd is 02 00 a m July 4th UTC A Gregorian date consists of the year month and day in the format YYYY MM DD for example 2003 09 19 for September 19 2003 The Gregorian date can be read from the board however the Gregorian date is not transmitted in the IRIG B output Instead the IRIG B Synchronizable Timecode Generator User Manual 6 1 Spectracom Corporation TPRO TSAT PCIU 2 66U output transmits
42. ays down to ones of seconds into the Holding Register There is a separate command for loading each of these digits The upper 4 bits of the command identify which digit is being loaded the lower 4 bits contain the actual data to load Once all the digits have been loaded a command is sent to arm the clock For example to set the clock to day 123 hour 11 minute 58 second 17 send the following sequence of commands to the Command Port 0x000000E0 Clear the Holding Register 0x00000051 0x00000062 0x00000073 Day 123 0x00000081 0x00000091 Hour 11 0x000000a5 0x000000b8 Minute 58 0x000000c1 0x000000d7 Second 17 0x0000004c Arm the clock for next 1PPS After sending the 0x0000004c command the board sets the milliseconds and microseconds to 000000 when the first 1PPS occurs the seconds do not increment Then on the second 1PPS pulse the time seconds begins to increment CAUTION The board expects the 1PPS input to be continuous If the 1PPS signal stops pulsing after the board establishes initial sync the board will continue to increment time freewheel However if the 1PPS signal resumes after a period of freewheeling the board may reset the clock time to 000 00 00 00 000000 This is because the 1PPS occurs outside of a narrow window in which the board expects it either because the 1PPS has moved or because the boara s time has drifted during freewheeling The arm command 0x0000004c must be sent no sooner th
43. cy for a pulse or square wave compute N as follows N 1000 F F is the frequency in Hertz Verify that the computed value is in the range of 2 to 65 534 inclusive Convert N into hexadecimal Base 16 notation For example if the desired output period is once every 25 seconds N 25 000 Base 10 converted to hexadecimal notation yields N 0x61a8 Send the hexadecimal number to the board by outputting the following sequence to the command register 0x000000E0 Clear the Holding Register 0x000000a6 0x000000b1 0x000000ca 0x000000d8 specifies N 0x61a8 The heartbeat output can be programmed for a square wave or a pulse and can be programmed to start immediately or at the beginning of the next cycle Send one of the following commands to command port 0x000000e5 Pulse mode starts at beginning of next cycle 0x000000e6 Pulse mode starts immediately 0x000000e7 Square wave starts at beginning of next cycle 0x000000e8 Square wave starts immediately The heartbeat output is present regardless of whether the board is in sync or freewheeling The power on default is 1PPS pulse mode 8 21 Using the Time Tag Input When the rising edge of the Time Tag Input P1 Pin 4 occurs the clock time is latched into a temporary register and this register is then loaded into the FIFO An interrupt on the PCI bus is generated if enabled The user s software establishes that a time tag has occurred in one of two ways either by examining the l
44. desired location on the rear panel then plug the board in Attach the top of the mounting bracket with the screw from the metal plate Close the computer plug in the line cord start the computer Depending on which operating system being used a message that identifies new hardware may appear this message may indicate that the hardware is of unknown type This is normal Exit the Found New Hardware dialogue box DO NOT click on Have Disk The TPRO and TSAT operate automatically as soon as the host computer system performs the power on reset To change the operating parameters or read data consult Chapter Seven Synchronizable Timecode Generator User Manual 5 Spectracom Corporation TPRO TSAT PCIU 2 66U An on board LED LED1 flashes a status pattern to assist in diagnosing installation errors The pattern is a sequence of short and long flashes To enable the status pattern to repeat more frequently trailing short flashes are deleted Table 5 1 LED Flash Patterns Flash Position Meaning of Short Cleared Flash Meaning of Long Set Flash 1 GPS satellite receiver being used for time Modulated timecode input being used for time reference reference 2 Synchronization to better than 5us verified with Synchronization to better than 5us not verified last 5 seconds within last 5 seconds 1 PPS pulse from GPS satellite receiver is bad 1PPS pulse from GPS satellite receiver is OK In applications with modulated timecode inputs
45. e FIFO empty 1 Timecode Present as input hasnoidetectabl Timecode input has a signal present 2 In sync Fla Clock is freewheeling GPS position is Clock is synced to timecode or GPS y 9 invalid and GPS position is valid 3 Match Flag Start time has not occurred Start time has occurred 4 Heartbeat Flag Heartbeat has not occurred Heartbeat has occurred 5 Heartbeat Int Mask PCI bus interrupt disabled for heartbeat PCI bus interruptoccursigneach heartbeat 6 Match Int Mask PCI bus interrupt disabled for start time ne interrupt occurs at thestar 7 FIFO Ready Int Mask PCI bus interrupt disabled for FIFO PCI bus interrupt occurs when FIFO data available data available 8 15 Reserved Reserved Reserved NOTE Bit 2 In Sync Flag is the only bit to examine when determining the validity of the time and position for TSAT Bit 1 Timecode Present is for diagnostic purposes only It indicates only that the amplitude of the timecode input is adequate for detection It does not indicate whether the input is valid For TSAT this bit will always be zero Synchronizable Timecode Generator User Manual 7 11 Spectracom Corporation TPRO TSAT PCIU 2 66U Bits 5 6 and 7 provide a means for reading back the corresponding bits in the Interrupt Control Port Bits 3 and 4 may be true 1 when power is first applied The user s software must clear bits 3 and 4 before using them 7 15 Interrupt Control Port The board can generate
46. e Gregorian date using the year and Julian date Set the year by sending the command sequence 0x0000006n 0x0000007n O0x0000008n 0x0000009n 0x000000ea to the command port For example to set the year to 2003 send 0x00000062 0x00000070 0x00000080 0x00000093 0x000000ea The year is reset to 0000 when power is first applied or when any of the following occur system reset firmware reset command 0x0000004f or writing to the Assert Reset or De assert Reset addresses 8 9 Reading the Year Gregorian Date and Altitude Not Applicable to Option M The GPS receiver s computations for the altitude TSAT only and Gregorian date TSAT and TPRO are reported in the FIFO in response to the 0x0000005d command Altitude is in units of meters relative to mean sea level Word Bits 7 4 Bits 3 0 0 first 5 D 1 5 D 2 10 Day 10 Day 3 10 meters 10 meters 4 10 meters 10 meters 5 10 meters 10 meters 6 10 meters 0 7 10 Year 10 Year 8 10 Year 10 Year 8 8 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 9 last 10 Month 10 Month The board increments the Gregorian date approximately one second after time rolls over from 23 59 59 to 00 00 00 HH MM SS This occurs on every date in every year Consequently the Gregorian date should not be used during minutes 59 and 00 this will avoid rollover problems 8 10
47. e command port O0x00f0 Clear the Holding Register 0x0034 0x0025 0x0016 0x0007 Specifies 4567 uS 0x00e0 set propagation correction 7 17 Setting the Start Stop Match Times Not Applicable to Options FXA FXB or HDRV The match output P1 Pin 8 goes high at the Start time and low at the Stop time The match interrupt occurs at the Start time not at the Stop time The match flag in the Status Register goes true at the Start time and remains true until the user clears it with a software command To specify the Start and Stop times first clear the Holding Register then command the days through seconds portion of the time send a set command next send the milliseconds through microseconds finally send another set command For example to command a Start time of day 123 hour 11 minute 58 second 17 456789 send the following sequence to the command port Ox00f0 Clear Holding Register 0x0051 0x0062 0x0073 Day 123 0x0081 0x0091 Hour 11 0x00a5 0x00b8 Minute 58 0x00c1 0x0047 Second 17 0x00el send days seconds 0x0084 0x0095 0x00a6 xx 456xxx seconds 0x00b7 0x00c8 0x0049 XxX Xxx789 seconds 0x00e2 send Start time To specify the Stop time the sequence is the same but the final command is 0x00e3 instead of 0x00e2 The sequence must be completed at least 50 mS before the commanded time occurs The match output and interrupt if enabled operates regardless of whether the board is in sync or freewheeling
48. east significant bit of the Status Register FIFO Ready flag to determine if it is a zero or by waiting for an interrupt Since the clock time is latched when Synchronizable Timecode Generator User Manual 8 15 Spectracom Corporation TPRO TSAT PCIU 2 66U the rising edge occurs the Time Tag data will be correct regardless of how long it takes to read the FIFO For test purposes a time tag event can be simulated by writing any value to Base Ox1C The result is indistinguishable from a time tag event on P1 Pin 4 The FIFO response to either of these events is shown here Word Bits 7 4 Bits 3 0 0 first 0 0 1 0 0 2 0 10 Days 3 10 Days 10 Days 4 10 Hours 10 Hours 5 10 Minutes 10 Minutes 6 10 Seconds 10 Seconds 7 10 Seconds 10 Seconds 8 1 Seconds 10 Seconds 9 last 1 Seconds 10 Seconds For example ifthe time tag occurs at day 123 hour 11 minute 58 second 17 456789 the contents read from the FIFO will be Word Contents 0 first OxUU00 U Unknown 1 2 3 4 5 6 7 8 9 NOTE OxUU00 OxUU01 0xUU23 OxUU11 OxUU58 OxUU17 OxUU45 OxUU67 last OxUU89 The Julian date not the Gregorian date is reported Erratic operation may result if the rate of the time tags exceeds 1000 per second There may be a delay of up to 200 uS before time tag data is available in the FIFO Some older boards repeated words 2 and 3 in bytes 0 and 1 r
49. ect it for damage If any equipment has been damaged in transit please contact Spectracom Customer Service at US 585 321 5800 If any problems occur during installation and configuration of your Spectracom product please contact Spectracom Technical Support at US 585 321 5823 or US 585 321 5824 CAUTION Electronic equipment is sensitive to Electrostatic Discharge ESD Observe all ESD precautions and safeguards when handling the timecode generator NOTE If equipment is returned to Spectracom it must be shipped in its original packing material Save all packaging material for this purpose 1 2 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 2 Specifications NOTE In this manual the prefix 0x indicates that the number is in hexadecimal Base 16 format 2 1 TPRO Board Only Table 2 1 Time Code Input Specifications Code Format autodetect IRIG A A132 IRIG B B122 NASA36 Amplitude 1 2 Vp p min 8 0 Vp p max Polarity Detected automatically Modulation Ratio 2 1 min 3 1 typical 4 1 max Input Impedance gt 10 Kohms Timing Accuracy Better than 100 ppm not suitable for tape playback Common Mode Voltage Differential input 100 V max Not supported with Option M Table 2 2 IRIG B Output Specifications Code Format IRIG B B122 Amplitude mark 3 5 Vp p type Modulation Ratio 3 1 Output Impedance 600 ohms T
50. ed operates regardless of whether the board is in sync or freewheeling 8 19 Programming the Heartbeat Output Not Applicable to HBIPPS FXA FXB LORI Options The heartbeat output P1 Pin 6 can be programmed to be either a pulse or a square wave The specified rate must be an exact multiple of 1 000 uS The range of programmable rates is Minimum Rate lowest frequency 44444444Heen nennen nnnnnnnnnnnnnnn nn 21 845 mS 45 7771 Hz Maximum Rate highest frequency 2444444Hnnennnnn nn nnnnnnnnnnnnnn nn 1 000 uS 1 000 MHz Pulse Width time low pulse mode only 150 nS min 450 nS max negative polarity To specify the rate or frequency compute the divide number N as follows Note that N must be exactly divisible by 3 meaning that the specified period must be an exact multiple of 1 000 us To specify a period for a pulse or square wave compute N as N 3t 10 t is the period in seconds To specify a frequency for a pulse or square wave compute N as N 3 10 F F is the frequency in Hertz Not all values of N are acceptable Verify that the computed value is evenly divisible by 3 and that it is in the range of 3 to 65 535 inclusive Convert N into hexadecimal Base 16 notation For example if the desired output frequency is 10 kHz N 300 Base 10 converted to hexadecimal notation yields N 0x012c Send the hexadecimal number to the board by outputting the following sequence t
51. es South i e if the reported value is greater than or equal to 180 subtract 180 degrees and change the sign to negative south It is important to convert minutes to decimal degrees before comparing to 180 degrees The response is in the format shown here 8 12 8 13 Report Number of GPS Satellites Being Tracked TSAT Only The GPS receiver determines automatically which satellites to track The number quantity of satellites being tracked is reported in the FIFO in response to sending command 0x005c to the Word Bits 7 4 Bits 3 0 0 first 5 f 1 5 f 2 0 10 Degrees 3 10 Degrees 10 Degrees 4 10 Minutes 10 Minutes 5 10 Minutes 10 Minutes 6 10 Minutes 10 Minutes 7 Reserved Reserved 8 Reserved Reserved 9 last Reserved Reserved command port The response is of the form shown here Word Bits 7 4 Bits 3 0 0 first 5 c 1 5 c 2 Reserved Reserved 3 Reserved Reserved 4 Reserved Reserved 5 Reserved Reserved 6 Reserved Reserved 7 0 of Satellites 8 Reserved Reserved 9 last Reserved Reserved NOTE The number of satellites tracked is for diagnostic purposes only The number of satellites ranges from 0 to 8 inclusive Valid time and position require that at least four satellites be tracked The In Sync flag in the Status Register must be used to actually determine whether the board is synchronized and providing valid pos
52. espectively Synchronizable Timecode Generator User Manual TPRO TSAT PCILU 2 66U Spectracom Corporation 8 22 Report Firmware Version The version of the embedded firmware is reported in the FIFO in response to the 0x000000e9 command For example firmware version 7A104221 is reported as shown below Word Bits 7 4 Bits 3 0 0 first E 9 1 E 9 2 7 A 3 1 0 4 4 2 5 2 1 6 Unknown Unknown 7 Unknown Unknown 8 Unknown Unknown 9 last Unknown Unknown NOTE The Firmware version is for diagnostic purposes only It is not possible to determine which options are present or which version is more recent by examining the version number The firmware version is also printed on the label on device U19 Some older boards ignore the 0x00e9 command 8 23 Report FPGA Version The FPGA_REV register is a read only register consisting of one 32 bit word of which only the lower 16 bits are used Each byte comprises of a portion of the revision The FPGA_REV Register is read from location Base 0x20 and is formatted as shown below Table 8 6 FPGA_REV Location Nibble Nibble Nibble Nibble Base 0x20 0x00 31 24 0x00 23 16 Major_Rev 15 8 Minor_Rev 7 0 Example If FPGA Revision 01 00 Major_Rev 01 Minor_Rev 00 8 24 Clear Flags Port Once the Match and or Heartbeat flag s get set it is necessary to clear the flag by writing a 1 to the
53. et propagation correction 8 18 Setting the Start Stop Match Times Not Applicable to Options FXA FXB or HDRV The match output P1 Pin 8 goes high at the Start time and low at the Stop time The match interrupt occurs at the Start time not at the Stop time The match flag in the Status Register goes true at the Start time and remains true until the user clears it with a software command To specify the Start and Stop times first clear the Holding Register then command the days through seconds portion of the time send a set command next send the milliseconds through microseconds finally send another set command For example to command a Start time of day 123 hour 11 minute 58 second 17 456789 send the following sequence to the command port 0x000000f0 Clear Holding Register 0x00000051 0x00000062 0x00000073 Day 123 0x00000081 0x00000091 Hour 11 0x000000a5 0x000000b8 Minute 58 0x000000c1 0x00000047 Second 17 0x000000el send days seconds 0x00000084 0x00000095 0x000000a6 xx 456xxx seconds 0x000000b7 0x000000c8 0x00000049 XX Xxx789 seconds 0x000000e2 send Start time To specify the Stop time the sequence is the same but the final command is 0x000000e3 instead of 0x000000e2 The sequence must be completed at least 50 mS before the 8 13 Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO TSAT PCIU 2 66U commanded time occurs The match output and interrupt if enabl
54. g the board 8 26 Assert De assert Reset These commands are for diagnostic purposes only Sending the Assert Reset command holds the hardware reset signal on the board in the asserted state This stops the on board CPU and clears the interrupt masks and Match and Heartbeat Flags The only command that the board will respond to in this state is the De assert Reset command The PCI bus interface is not affected Send the Assert Reset command by writing any data value to location Base 0x0C Send the De assert Reset command by writing any data value to location Base 0x08 Wait at least eight seconds after sending the De assert Reset command before commanding or interrogating the board NOTE After the Assert Reset command is sent the diagnostic light on the rear panel stops flashing it may be either lit or not lit This can be used as an indication to determine if the user s software is capable of writing to the board i e that the PCI bus addressing is working correctly Sending the De assert Reset command without first sending an Assert Reset command will also reset the board Synchronizable Timecode Generator User Manual 8 19 Spectracom Corporation TPRO TSAT PCIU 2 66U 8 20 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 9 Options and Accessories 9 1 Options Refer to Configuration for the jumper settings that support the options herein 9 1 1 DCLOBNC This option provide
55. hat the first word has been written into the FIFO and reads it out it is possible that the FIFO will be empty for a moment Thus when the second word is put into the FIFO it generates another interrupt The solution is to disable the FIFO Ready interrupt until all 10 words have been read from the FIFO then re enable the interrupt 7 12 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 7 16 Setting the Propagation Delay Correction This command is used to correct for delays that are due to cable length timecode or GPS cables Most applications do not need to compensate for cable delays because the delay is on the order of a hundred nanoseconds while the clock s resolution is 1 microsecond However introducing a deliberate large offset can be helpful in situations in which the board is used to trigger an instrument slightly before a particular time The range of the propagation correction is 1000 uS to 8999 uS The power on default is zero To specify the propagation delay first clear the Holding Register then write four words representing each of the digits in the delay value then send the Set Clock Time Propagation Time command A special number sequence is used to specify negative delays To specify delays from 1000 uS to 1 uS send values of 9000 to 9999 respectively For example to specify a correction of 4567 uS send the following sequence of commands to th
56. hough the on board CPU writes this data it also maintains the time days through milliseconds in software and places a higher priority on maintaining the time than on filling the FIFO Thus it is not uncommon that for example only three of the ten words are written into the FIFO then following a substantial delay the remaining seven words are written The user s software must allow for such operation i e it must not give up just because it has not read all ten words before the status indicates that the FIFO is empty Either wait 200 uS before beginning to read or allow for enough retries if FIFO empty status is detected prematurely To check the FIFO Ready flag read the Status Register at Base 0x04 If the least significant bit is a zero there is data in the FIFO If this bit is a one the FIFO is empty The FIFO holds 512 words i e 51 responses Letting these responses stack up in the FIFO is acceptable but the user s software is responsible for knowing what each of the responses is During initialization the user s software must flush the FIFO Do this by reading the FIFO until the FIFO Ready flag is a one This could take up to 512 reads maximum Responses to user commands echo the command in the first two words from the FIFO This can be useful in sorting out multiple responses that are stacked up in the FIFO 8 4 Reading Clock Time The current clock time is read as two 32 bit words TIME_REG_LOW and
57. ins the data For other commands both the high and low nibbles are constant It is necessary to wait at least 100 uS after sending each command word before sending anything else to the command port 7 4 Synchronizable Timecode Generator User Manual TPRO TSAT PCILU 2 66U Spectracom Corporation Table 7 3 Command Functions Function Command Reset Firmware 0x004f Enable Sync 0x004d Disable Sync 0x004e Report Firmware Version in FIFO 0x00e9 Report Number of GPS Satellites in FIFO TSAT only 0x005c Report Altitude amp Gregorian Date in FIFO 0x005d Report Longitude in FIFO TSAT only 0x005e Report Latitude in FIFO TSAT only 0x005f Clear Holding Register 0x00f0 Put 10 Days in Holding Register 0x0050 53 Put 10 Days in Holding Register 0x0060 69 Put 10 Days in Holding Register 0x0070 79 Put 10 Hours or 10 Seconds in Holding Register 0x0080 89 Put 10 Hours or 10 Seconds in Holding Register 0x0090 99 Put 10 Minutes 10 Seconds or 16 Heartbeat in Holding Register 0x00a0 af Put 10 Minutes 10 Seconds or 16 Heartbeat in Holding Register 0x00b0 bf Put 10 Seconds 10 Seconds or 16 Heartbeat in Holding Register 0x00c0 cf Put 10 Seconds 10 Seconds or 16 Heartbeat in Holding Register Ox00d0 df Put Propagation Delay 10 us in Holding Register 0x0030 39 Put Propagation Delay 10 uS in Holding Register 0x0020 29 Put
58. internal atomic clock and transmits a signal specifying the time and satellite position On the ground the GPS receiver determines its position longitude latitude and elevation and the time by decoding the signals simultaneously from at least four of the GPS satellites The satellite orbits are circular inclined approximately 56 degrees from the equator orbiting the Earth once every 11 hours There are several different orbital planes providing continuous coverage to all places on Earth The GPS receiver uses an omni directional antenna the satellites move slowly across the sky they are not at fixed locations Each satellite transmits a spread spectrum signal centered at 1575 42 MHz When power is first applied the GPS receiver begins searching for the satellites It does this by searching for each satellite individually listening for each satellite s distinct spread spectrum hopping sequence This process can take a few minutes as the receiver iteratively locates satellites refines its position and determines for which satellites to search The GPS receiver retains the last known position when the power is switched off This results in faster satellite acquisition the next time it is switched on If the antenna has been moved more than a few miles however acquisition time will be slightly longer because it must first re compute the position Synchronizable Timecode Generator User Manual 1 1 Spectracom Corporation TPRO TSAT PCIU
59. interrupts when the FIFO has data when each heartbeat occurs and or when the commanded Start Time occurs Each of these is enabled separately via the Interrupt Control Port and any all or none can be enabled simultaneously The Interrupt Control Port is a single 16 bit word of which only 3 bits are actually used It is located at Base 0x00 and is write only The bits in the Interrupt Control Port are defined as shown in Table 7 5 Table 7 5 Interrupt Control Port Bit Definitions Bit Name Writing 0 Action Writing 1 Action 0 4 Reserved Reserved Reserved 5 Heartbeat Interrupt Mask No PCI interrupt on heartbeat Heartbeat causes PCI interrupt 6 Match Interrupt Mask No PCI interrupt at start time Start time causes PCI interrupt 7 FIFO Ready Int Mask No PCI interrupt when data is available in FIFO PCI interrupt when data is available in FIFO 8 15 Reserved Reserved Reserved The board generates the same interrupt regardless of whether it was caused by heartbeat start time or FIFO data available After an interrupt the user s software must interrogate the board to determine which of these was the cause The power on default is to have all interrupts disabled Also sending the Assert Reset command disables all interrupts CAUTION The FIFO Ready interrupt occurs each time the FIFO changes from being empty to containing data If the user s software detects quickly t
60. is put into the FIFO it generates another interrupt The solution is to disable the FIFO Ready interrupt until all 10 words have been read from the FIFO then re enable the interrupt 8 12 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 8 17 Setting the Propagation Delay Correction This command is used to correct for delays that are due to cable length timecode or GPS cables Most applications do not need to compensate for cable delays because the delay is on the order of a hundred nanoseconds while the clock s resolution is 1 microsecond However introducing a deliberate large offset can be helpful in situations in which the board is used to trigger an instrument slightly before a particular time The range of the propagation correction is 1000 uS to 8999 uS The power on default is zero To specify the propagation delay first clear the Holding Register then write four words representing each of the digits in the delay value then send the Set Clock Time Propagation Time command A special number sequence is used to specify negative delays To specify delays from 1000 uS to 1 uS send values of 9000 to 9999 respectively For example to specify a correction of 4567 uS send the following sequence of commands to the command port 0x000000f0 A 0x00000034 0x00000025 0x00000016 Ox00000007 0x000000e0 7 Clear the Holding Register Specifies 4567 US s
61. ither Pin 5 or Pin 7 of the connector The timing card will detect the presence of the 1PPS signal automatically so no configuration changes are required for the card to use the 1PPS signal The presence of the 1PPS signal is indicated by the onboard LED LED1 status pattern Refer to Table 5 1 for more information concerning LED flash patterns NOTE The 10 MHz output is eliminated If both 1PPS and IRIG B timecode inputs are present the board will synchronize to the incoming timecode and ignore the 1PPS IRG A is not supported when option M is enabled 9 2 Accessories 9 2 1 GPS Optic Isolator This option provides fiber optic technology for voltage secure environments 9 2 2 GPS Cables Contact Spectracom for more information on GPS cable length options 9 2 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 10 Driver Support Please contact your sales representative for information about Spectracom s bus level timing board driver support for Windows Linux Solaris and a variety of other platforms You may also visit our website at www spectracomcorp com to download datasheets and manuals Synchronizable Timecode Generator User Manual Spectracom Corporation TPRO TSAT PCIU 2 66U 10 2 Synchronizable Timecode Generator User Manual REVISION HISTORY Revision ECN u First iteration of this Spectracom product documentation Added FCC compliance statement PCI 33U product
62. ition 8 10 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation There is no difference in timing accuracy when 5 6 7 or 8 satellites are being tracked It is normal for the number to fluctuate between 5 and 8 given that the GPS receiver picks different satellites to optimize the timing It is normal for the number of satellites to be between O and 3 during acquisition and re acquisition 8 14 Enable Disable Sync The board can be forced to freewheel by sending the Disable Sync command Sending this command causes the board to ignore the timecode input the 1PPS input Option M only and the GPS input TSAT only To restore normal operation send the Enable Sync command To send the Disable Sync command write 0x0000004e to the command port To send the Enable Sync command write 0x0000004d to the command port The power on default is to Enable Sync 8 15 Reading the Status Register The Status Register consists of one 32 bit word of which only the lower 8 bits are used The Status Register is read from location Base 0x04 and is formatted as shown in Table 8 4 Table 8 4 Status Register Format Bit Name Meaning When 0 Meaning When 1 ee FIFO Ready Flag FIFO Ready data available FIFO empty 1 Timecode Present as input hasnoidetectabl Timecode input has a signal present 2 In sync Fla Clock is freewheeling GPS position is
63. maturely To check the FIFO Ready flag read the Status Register at Base 0x02 If the least significant bit is a zero there is data in the FIFO If this bit is a one the FIFO is empty The FIFO holds 512 words i e 51 responses Letting these responses stack up in the FIFO is acceptable but the user s software is responsible for knowing what each of the responses is During initialization the user s software must flush the FIFO Do this by reading the FIFO until the FIFO Ready flag is a one This could take up to 512 reads maximum Responses to user commands echo the command in the first two words from the FIFO This can be useful in sorting out multiple responses that are stacked up in the FIFO 7 4 Reading Clock Time The current clock time is read as four 16 bit words Reading the first word latches all four words thus the latency time between reading them does not affect the accuracy This also means that it is important to read the least significant word first as this causes the other words to be latched It is not necessary to read all four words if the application does not need the complete clock time NOTE These locations are read only A different sequence is used to set the time Refer to the sections on setting the clock time It is also necessary to examine the status register to determine if the time is valid The Julian date not the Gregorian date is reported The value range for Days is 000 366 Be
64. o the command register 0x000000f0 Clear the Holding Register 0x000000a0 0x000000b1 0x000000c2 0x000000dc specifies N 0x012c The heartbeat output can be programmed for a square wave or a pulse and can be programmed either to start immediately or at the beginning of the next cycle Send one of the following commands to command port 0x000000e5 Pulse mode starts at beginning of next cycle 0x000000e6 Pulse mode starts immediately 0x000000e7 Square wave starts at beginning of next cycle 0x000000e8 Square wave starts immediately The heartbeat output is present whether the board is in sync or is freewheeling The power on default is 100 PPS pulse mode 8 14 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 8 20 Programming the Heartbeat Output For Options HBIPPS FXA FXB and LORT Only The heartbeat output P1 Pin 6 can be programmed to be either a pulse or a square wave The specified rate must be an exact multiple of 1 000 mS The range of programmable rates is Minimum Rate lowest frequency 65 534 Seconds 0 0152593 Hz Maximum Rate highest frequency 2 mS 500 Hz Pulse width time low pulse mode only 1 mS typical Programming Resolution 1 ms To specify the rate or frequency compute the divide number N as follows To specify a period for a pulse or square wave compute N as follows N t 001 t is the period in seconds To specify a frequen
65. of the claim with full information as fo the claimed defect Spectracom products shall not be returned unless a return authorization number is issued by Spectracom Spectracom products must be returned with the description of the claimed defect and identification of the individual to be contacted if additional information is needed Spectracom products must be returned properly packed with transportation charges prepaid Shipping expense Expenses incurred for shipping Spectracom products to and from Spectracom including international customs fees shall be paid for by the customer with the following exception For customers located within the United States any product repaired by Spectracom under a warranty repair will be shipped back to the customer at Spectracom s expense unless special faster delivery is requested by customer Spectracom highly recommends that prior to returning equipment for service work our technical support department be contacted to provide trouble shooting assistance while the equipment is still installed If equipment is returned without first contacting the support department and no problems are found during the repair work an evaluation fee may be charged EXCEPT FOR THE LIMITED WARRANTY STATED ABOVE SPECTRACOM DISCLAIMS ALL WARRANTIES OF ANY KIND WITH REGARD TO SPECTRACOM PRODUCTS OR OTHER MATERIALS PROVIDED BY SPECTRACOM INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OR MERCHANTABILITY OR
66. on every date in every year Consequently the Gregorian date should not be used during minutes 59 and 00 this will avoid rollover problems 7 10 Report Longitude TSAT Only The GPS receiver s computation for longitude is put into the FIFO in response to the 0x005e command The units are degrees minutes and fractions of minutes The response is in the following format Word Bits 7 4 Bits 3 0 0 first 5 e 1 5 e 2 0 10 Degrees 3 10 Degrees 10 Degrees 4 10 Minutes 10 Minutes 5 10 Minutes 10 Minutes 6 10 Minutes 10 Minutes 7 Reserved Reserved 8 Reserved Reserved 9 last Reserved Reserved NOTE lf the reported value is less than 180 degrees the longitude is East for Europe Africa Asia etc If the reported value is greater than or equal to 180 degrees subtract 180 degrees to obtain west longitude for USA Canada Central amp South America etc For example the reported value for Los Angeles CA USA will be approximately 298 degrees Since this is greater than 180 subtract 180 to get the correct value i e 118 degrees West Be sure to convert minutes to decimal degrees before comparing to 180 degrees Synchronizable Timecode Generator User Manual 79 TPRO TSAT PCIU 2 66U Spectracom Corporation 7 11 Report Latitude TSAT Only The GPS receiver s computation for latitude is put into the FIFO in response to the 0x005f command The units
67. r places a higher priority on maintaining the time than on processing commands The actual amount of time needed to process a command depends on when the command was received relative to the on board time Entries in Chapter Six specify the amount of time needed to assure that the command was received There is no restriction on reading from the board Each 16 bit word is located on an even address Although many of the registers use only eight bits always read and write registers as 16 bit entities Do not attempt an 8 bit access on an odd address location Synchronizable Timecode Generator User Manual 7 Spectracom Corporation TPRO TSAT PCIU 2 66U 7 2 Register Locations NOTE In this manual the prefix 0x indicates that the number is in hexadecimal Base 16 format Table 7 1 Register Locations for PRO TSAT U 2 Location Read Usage Write Usage Register Function R Returns response data from the board Base 0x00 FIFO Interrupt Control p Port W Interrupt control register R Returns status information for the board Base 0x02 Status Register Command Port W Issues commands to the board Base 0x04 De assert Reset Releases the board from reset H Base 0x06 on Assert Reset Places the board into reset Base 0x08 Clock Days Returns portion of latched time Base 0x0a Clock Hours Returns portion of latched time Minutes Clock Seconds Base 0x0c through 10 mS Returns portion of latched time Clock
68. register Ox00f0 Clear the Holding Register 0x00a0 0x00b1 0x00c2 0x00dc specifies N 0x012c The heartbeat output can be programmed for a square wave or a pulse and can be programmed either to start immediately or at the beginning of the next cycle Send one of the following commands to command port 0x00e5 Pulse mode starts at beginning of next cycle 0x00e6 Pulse mode starts immediately 0x00e7 Square wave starts at beginning of next cycle 0x00e8 Square wave starts immediately The heartbeat output is present whether the board is in sync or is freewheeling The power on default is 100 PPS pulse mode 7 14 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 7 19 Programming the Heartbeat Output For Options HBIPPS FXA FXB and LORT Only The heartbeat output P1 Pin 6 can be programmed to be either a pulse or a square wave The specified rate must be an exact multiple of 1 000 mS The range of programmable rates is Minimum Rate lowest frequency 65 534 Seconds 0 0152593 Hz Maximum Rate highest frequency 2 mS 500 Hz Pulse width time low pulse mode only 1 mS typical Programming Resolution 1 ms To specify the rate or frequency compute the divide number N as follows To specify a period for a pulse or square wave compute N as follows N t 001 t is the period in seconds To specify a frequency for a pulse or square wave compute N as follows
69. result in degraded performance Specifically the GPS receiver can track fewer than four satellites which would prevent it from obtaining time synchronization To optimize timing accuracy the GPS receiver attempts to track satellites that are spread out as far as possible across the sky The GPS receiver antenna must be mounted with the connector side pointing down and must be spaced at least 39 inches 1 meter away from other GPS antennas Mount the antenna at the desired location Connect the round end of the supplied cable to the antenna Take appropriate lightning precautions as necessary NOTE Spectracom recommends applying an appropriate silcon grease to the cable connection at the GPS antenna in order to protect the connection from moisture An additional weatherproofing kit P N 221213 containing butyl rubber and plastic tape is also available from Andrews Corporation US 800 255 1479 5 2 Installing the Board in the Computer Shut the computer down then turn its power switch off and unplug the line cord Open the computer and install the board in any unused PCI slot CAUTION Observe all ESD procedures when handling the board and the computer Before installing the board discharge static buildup by touching the metal frame of the computer with one hand and the protective bag containing the board with the other hand Open the protective bag only after static buildup has been safely discharged Remove the metal plate at the
70. s an IRIG B DCLS output on the J2 BNC connector and P1 D type connector Pin 9 The BNC or the 15 pin D type connector provides a DC level shifted output with the rising edge on time The modulated IRIG B output is eliminated with this option 9 1 2 HB1PPS Cannot Be Combined with Options FXA FXB HDRV This option provides a 1PPS on the heartbeat output at power up The heartbeat output P1 Pin 6 can be programmed as either a pulse or a square wave The specified rate must be an exact multiple of 1 000 mS The range of programmable rates is Minimum Rate lowest frequency ccccccceeeeentteeeeeeeeeeetees 65 534 Seconds 0 0152593 Hz Maximum Rate highest frequency 444444nnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn san 2 mS 500 Hz Pulse Width time low pulse mode only 1 mS typical Programming Resolution us 2 20 een nd 1mS The default rate at power up is 1Hz pulse mode 9 1 3 FXA TSAT Only Cannot Be Combined with Options HB1PPS HDRV This option provides an RS 422 driver for the Heartbeat Output and provides the same range of pulse rates as the HB1PPS Option The 15 pin D type connector provides the Heartbeat Output on Pin 6 normally low pulses high and Pin 8 normally high pulses low The rising edge of Pin 6 falling edge of Pin 8 is on time The pulse width is approximately 1 mS The power on default pulse rate is once per second 1PPS The Match function can
71. sable Sync 0x0000004e Report Firmware Version in FIFO 0x000000e9 Report Number of GPS Satellites in FIFO TSAT only 0x0000005c Report Altitude amp Gregorian Date in FIFO 0x0000005d Report Longitude in FIFO TSAT only 0x0000005e Report Latitude in FIFO TSAT only 0x0000005f Clear Holding Register 0x000000f0 Put 10 Days in Holding Register 0x00000050 53 Put 10 Days in Holding Register 0x00000060 69 Put 10 Days in Holding Register 0x00000070 79 Put 10 Hours or 10 Seconds in Holding Register 0x00000080 89 Put 10 Hours or 10 Seconds in Holding Register 0x00000090 99 Put 10 Minutes 10 Seconds or 16 Heartbeat in Holding Register 0x000000a0 af Put 10 Minutes 10 Seconds or 16 Heartbeat in Holding Register 0x000000b0 bf Put 10 Seconds 10 Seconds or 16 Heartbeat in Holding Register 0x000000c0 cf Put 10 Seconds 10 Seconds or 16 Heartbeat in Holding Register 0x000000d0 df Put Propagation Delay 10 uS in Holding Register 0x00000030 39 Put Propagation Delay 10 uS in Holding Register 0x00000020 29 Put Propagation Delay 10 uS in Holding Register 0x00000010 19 Put Propagation Delay 10 uS in Holding Register 0x00000000 09 Copy Holding Register to Clock Time or Propagation Time 0x000000e0 Copy Holding Register to Start Stop Time Days Seconds 0x000000e1 Copy Holding Register to Start Time 107 to 10 Seconds 0x000000e2 Copy Holding Register to Stop Time 107 to 10 Seconds 0x000000e3 Copy Holding Register to Clock
72. still be used to provide an interrupt if desired However the Match Output Pin has been eliminated There are no jumpers installed on Header JP9 9 1 4 FXB TPRO Only Cannot Be Combined with Options HB1PPS HDRV This option provides an RS 422 driver for the Heartbeat Output and provides the same range of pulse rates as the HB1PPS Option The 15 pin D type connector provides the Heartbeat Output on Pin 6 normally low pulses high and Pin 8 normally high pulses low The rising edge of Pin 6 falling edge of Pin 8 is on time The pulse width is approximately 1 mS The power on default pulse rate is once per second 1PPS The Match function can still be used to provide an interrupt if desired However the Match Output Pin has been eliminated There are no jumpers installed on Header JP9 9 1 5 LOR1 This option provides the board with three different outputs on a three pin header a 1 Megahertz Output IMHZ 1 Pulse Per Second Output 1PPS and a Ground Output The 3 pin header is located on JP11 Pins 6 7 and 8 Synchronizable Timecode Generator User Manual 9 1 Spectracom Corporation TPRO TSAT PCIU 2 66U The 3 pin header designations are e JP11 Pin 6 is IMHZ e JP11 Pin 7 is 1PPS JP11 Pin 8 is Ground 9 1 6 M TPRO Only Option M synchronizes to an external 1PPS input instead of the standard IRIG timecode input The external 1PPS signal is connected to Pin 15 of the DB15 connector P1 Ground is connected to e
73. stops flashing it may be either lit or not lit This can be used as an indication to determine if the user s software is capable of writing to the board i e that the PCI bus addressing is working correctly Sending the De assert Reset command without first sending an Assert Reset command will also reset the board 7 18 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 8 Programming the TPRO TSAT 66U 8 1 General Information The universal PCI bus sees the board as a device that has 64 consecutive 32 bit memory locations 64 bytes and 64 consecutive 32 bit I O locations 64 bytes During startup the PCI BIOS part of the host computer mapped these locations somewhere in the absolute address space Two Base Address Registers BAR s are provided which permit the operating system OS driver to map the register space as both Memory and I O on the PCI bus BARO provides memory space mapping while BAR1 maps as I O Both BARs are configured to request 64 bytes of space from the OS corresponding to sixteen 32 bit registers The 64 memory locations and the 64 I O locations serve exactly the same functions In actual use only one of these either memory or I O is used the other is ignored On host computers with Intel CPUs e g Pentium 486 etc use the I O locations On host computers with Motorola CPUs e g the 68000 family use the memory locations since Motorola does not have I
74. t the clock time to 000 00 00 00 000000 This is because the 1PPS occurs outside of a narrow window in which the board expects it either because the 1PPS has moved or because the boara s time has drifted during freewheeling The arm command 0x004c must be sent no sooner than 50 mS after the previous 1PPS occurred and no later than 50 mS before the next arming 1PPS occurs Synchronizable Timecode Generator User Manual Z7 Spectracom Corporation TPRO TSAT PCIU 2 66U NOTE If both 1PPS and Timecode inputs are present the board will sync to the incoming timecode and ignore the 1PPS Commands 0x004d and 0x004e Enable Disable Sync apply both to the 1PPS and the timecode input Commands Ox00e0 set clock and Ox00ea set year are not applicable to boards with Option M The user s software must ensure that the commanded values are in the appropriate ranges The board does not error check the data before loading the clock Commanding invalid values e g 39 hours will cause erratic operation 7 8 Setting the Year Not Applicable to Option M Whether the IRIG B output is synchronized to GPS or timecode or is freewheeling it counts from day 365 to day 001 unless the year is set to a leap year Once set to a leap year the IRIG B output counts from 365 to 366 then to 001 The TSAT acquires the year from the GPS satellites The year can also be set by command if the GPS receiver is not connected To function properly the
75. the Julian date an integer from 001 366 that represents the day number in the year This limitation is due to the standard definition of the IRIG B code format The on board clock continues to increment time freewheel while not tracking satellites When power is first applied time begins freewheeling from 000 00 00 00 then jumps to the correct time when synchronization is established 6 2 TPRO The TPRO acquires time from the timecode input synchronizes its on board clock to this time and provides an IRIG B output from its on board clock The timecode input consists of an amplitude modulated sine wave carrier frequency is 1 kHz for IRIG B or NASA36 or 10 kHz for IRIG A The code format is detected automatically The board does not significantly load the timecode input and since it is a very low frequency cable impedance mismatches do not significantly degrade the signal either Thus a single timecode source can drive at least 10 inputs Cable termination is not necessary cable length can be up to several hundred feet and a variety of cable types can be used Usually coaxial cable RG 58 or RG 59 type with BNC connectors is used Multiple boards can be driven by placing a BNC T connector at each board and connecting the timecode input in a daisy chain configuration For another approach take the IRIG B output from one board to the timecode input of the next board i e a loop through configuration The advantage of the loop
76. ue The pigtail on the 15 pin end of the cable is used for custom options if any 3 2 P1 Connector Pinout TPRO Only The timecode input can be applied either to Pins 1 and 2 of P1 or to the J1 BNC connector this is the connector closest to P1 The timecode input is a differential signal i e timecode input is isolated from ground It is acceptable to connect timecode input to ground The IRIG B output can be taken either from Pin 9 of P1 or from the J2 BNC connector this is the connector farthest from P1 The IRIG B output is a single ended signal i e it is referenced to ground Table 3 2 TPRO P1 Connector Pinout P1 Pin User Connection Other Options 1 IRIG IN 2 IRIG IN 3 Do not use 4 Time Tag input 5 Ground 6 Heartbeat output FXB HB1PPS HDRV 7 Ground 8 Match time output FXB HDRV 9 IRIG B Output DCLOBNC 10 11 12 13 14 15 10 MHz output Option M Refer to Section 9 Options and Accessories for more information 3 2 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom Corporation 3 3 Time Code Input BNC Connector J1 The timecode input BNC connector is located nearest the 15 pin D type connector 3 4 IRIG B Output BNC Connector J2 The IRIG B output BNC connector is located farthest from the 15 pin D type connector
77. ve the horizon at all times anywhere on Earth The receiver must track at least four satellites simultaneously in order to determine time and position Best accuracy is achieved when the satellites that are being tracked are scattered widely across the sky the receiver automatically attempts to choose satellites based on maximum apparent separation Therefore it is important that the antenna have a clear view of as much sky as possible and for the same reason be mounted with the connector pointed down The satellites do not remain at a fixed location in the sky Occasionally the receiver stops tracking a satellite and begins searching for another one this causes fluctuations in the number of satellites tracked between five and eight The most common complaint among new GPS users is that the time needed to begin tracking satellites varies each time the unit is turned on or that it seems to take a long time to begin tracking Refer to the section entitled Specifications in Chapter Two for typical and maximum times and note that significant variations around the typical time are normal If the receiver has not established synchronization after the maximum time specified the most probable reason is that the antenna does not have an unobstructed view of the sky try re locating the antenna Note that the GPS receiver is built into the antenna housing additional filtering cannot be installed When power is applied the GPS receiver
78. vice This means that the universal PCI bus sees the board as a device that has thirty two consecutive 16 bit memory locations 64 bytes and thirty two consecutive 16 bit I O locations 64 bytes During startup the PCI BIOS part of the host computer mapped these locations somewhere in the absolute address space The thirty two memory locations and the thirty two I O locations serve exactly the same functions In actual use only one of these either memory or I O is used the other is ignored On host computers with Intel CPUs e g Pentium 486 etc use the I O locations On host computers with Motorola CPUs e g the 68000 family use the memory locations since Motorola does not have I O instructions The locations of the board s registers are specified as Base Offset The offsets are constants as described in the next section The Base is chosen by the PCI BIOS during startup There is a separate Base for the memory and I O locations Time is read as four 16 bit words and is in binary coded decimal format Status is read as a single 16 bit word Time tags and for the TSAT GPS information longitude latitude altitude and Gregorian date are read by first sending a command to the board then reading ten 16 bit words from a first in first out FIFO register The user s software must wait a short amount of time after sending each command This admittedly cumbersome requirement is necessary because the on board processo
79. zero or by waiting for an interrupt Since the clock time is latched when Synchronizable Timecode Generator User Manual PND Spectracom Corporation TPRO TSAT PCIU 2 66U the rising edge occurs the Time Tag data will be correct regardless of how long it takes to read the FIFO For test purposes a time tag event can be simulated by writing any value to Base 0x12 The result is indistinguishable from a time tag event on P1 Pin 4 The FIFO response to either of these events is shown here Word Bits 7 4 Bits 3 0 0 first 0 0 1 0 0 2 0 10 Days 3 10 Days 10 Days 4 10 Hours 10 Hours 5 10 Minutes 10 Minutes 6 10 Seconds 10 Seconds 7 10 Seconds 10 Seconds 8 1 Seconds 10 Seconds 9 last 1 Seconds 10 Seconds For example ifthe time tag occurs at day 123 hour 11 minute 58 second 17 456789 the contents read from the FIFO will be Word Contents 0 first O0xUU0O U Unknown 1 OxUU00 2 OxUU01 3 O0xUU23 4 OxUU11 5 0xUU58 6 OxUU17 7 OxUU45 8 OxUU67 9 last 0xUU8 9 NOTE The Julian date not the Gregorian date is reported Erratic operation may result if the rate of the time tags exceeds 1000 per second There may be a delay of up to 200 uS before time tag data is available in the FIFO Some older boards repeated words 2 and 3 in bytes 0 and 1 respectively 7 16 Synchronizable Timecode Generator User Manual TPRO TSAT PCI U 2 66U Spectracom

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