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DE8661 DemoKit User Manual

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1. 1 Enabled 550Hz 2 Enabled 1800Hz amp Tn Register Parameter Test function n Mapped to S21 register 0 Terminate test 1 Reserved 2 Reserved 3 Local digital loopback 4 Enable remote request for digital loopback 5 Disable remote request for digital loopback 6 Request remote digital loopback amp initiate 1 6 5 General Description of AT Commands Supported AT commands are listed in section 1 6 4 Valid commands will generate an OK result code see section 1 6 6 and invalid commands will be rejected with an ERROR result code when command echoing and word result codes are enabled The CMX866 will send a lt LF gt character directly after a CR character to ensure compatibility with external uControllers Any commands which are not fully implemented will return the result code NYI Not Yet Implemented AT commands should not be sent to the on chip yu Controller until the previous result code if enabled has been received Each command line except for A and the escape sequence must begin with the AT prefix and be terminated with a carriage return CR The CMX866 waits to receive a complete AT command line before processing it Embedded spaces are ignored and the case upper or lower of characters including the AT does not matter The command line must not exceed 48 characters excluding the AT characters The CMX866 will ignore the command line and return an ERROR result code if the line is not terminated correctl
2. Serial Interface The DE8661 can be controlled by sending AT commands over a direct serial interface from an external uController or with a standard terminal emulator program running on a host PC and connected via RS 232 This latter option makes use of the 9 pin D type socket and MAX3237 RS 232 Transceiver chip both of which are fitted to one of the break off sections of the DE8661 PCB Asynchronous communication is used with 9600 baud 8 bit words no parity and 1 stop bit The 9600 baud rate necessitates CTS flow control to moderate the data rate The CTS flow control method provided on the CMX866 will also work with the RTS CTS handshake protocol used by some uControllers If using an external uController to control the DE8661 its Request To Send signal should be taken low which takes the CMX866 RTSN pin low Data is asserted AT commands or data by the external u Controller onto the CMX866 TXD pin When the DE8661 is ready to accept this data from the external host uController the CMX866 will takes its CTSN pin low The data should be sent as 8 bit bytes encapsulated by a start bit low and a stop bit high The DE8661 should be presented with continuous mark stop bits when the external Controller has no data to send As each byte is received it is stored in an on chip 48 byte AT command buffer when in Command mode or in an on chip 16 byte receive data buffer when in Data Transfer mode The CMX866 will take its CTSN pin high when either
3. Zn n 0 1 Zero Power state n 0 or Powersave state n 1 Rn n 00 FF DSP Register n Read Display specified DSP Register contents Rn x n 00 FF DSP Register n Write Write to specified DSP Register 2004 CML Microsystems Plc 15 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 S Registers Parameters Function Default SO 0 255 Number of rings before answering 0 Auto answer disabled 2 S1 0 255 Number of rings received 0 S2 0 127 Escape character value S3 0 127 Carriage return character value CR S4 0 127 Line feed character value LF S5 0 127 Backspace character value BS S6 2 255 Waiting time in seconds for dial tone or before blind dialling 4s S7 2 255 Maximum waiting time in seconds for carrier 50s S8 0 255 Pause time in seconds for dial modifier 2s S9 1 255 Reserved 10 1 255 Lost carrier to hang up delay in units of 100ms 700ms S11 5 255 DTMF tone duration and interdigit pause duration in units of 10ms 100ms 12 0 255 Escape code guard time in units of 50ms 1s 13 Reserved 14 0 255 General Options bypass Answer Tone Detect sequence for Fast Connect 92 15 0 255 Loopback carrier off time in milliseconds 80ms S16 0 255 Drop time for loopback in milliseconds 60ms S17 0 255 Handshake timeout Answering in seconds 30s S18 0 255 Loopback timer 0 no timeout
4. any part of this product specification Evaluation kits and demonstration boards are supplied for the sole purpose of demonstrating the operation of CML products and are supplied without warranty They are intended for use in a laboratory environment only and are not for re sale end use or incorporation into other equipments Operation of these kits and boards outside a laboratory environment is not permitted within the European Community All software firmware is supplied as is and is without warranty It forms part of the product supplied and is licensed for use only with this product for the purpose of demonstrating the operation of CML products Whilst all reasonable efforts are made to ensure that software firmware contained in this product is virus free CML accepts no resonsibility whatsoever for any contamination which results from using this product and the onus for checking that the software firmware is virus free is placed on the purchaser of this evaluation kit or development board www cmlmicro com For FAQs see www cmlmicro com products faqs For a full data sheet listing see www cmlmicro com products datasheets download htm For detailed a EU ow Microcircuits UK Ltd Oval Park Langford Maldon Essex CM9 6WG England Tel 44 0 1621 875500 Fax 44 0 1621 875600 Sales sales a cmlmicro com Technical Support techsupport cmlmicro com lication notes www cmlmicro com products a EU cw Mic
5. buffer is full and will ignore further information on the TXD pin until the on chip uController is ready to accept it At this time the CMX866 will once again take its CTSN pin low to signify its readiness to accept more data providing the RTSN pin is already low If the external uController does not have a Request To Send signal the RTSN pin should be permanently wired low When RTSN is inactive high CTSN follows RTSN and becomes inactive high thus there is no data flow in either direction between the DE8661 and the external uController As the incoming AT command is being interpreted any phone number is identified and stored separately in the 24 byte on chip phone number buffer When the DE8661 is in Data Transfer mode and a signal is received from the phone line exceeding the minimum amplitude threshold the CMX866 will attempt to demodulate the signal and assert the received data on its RXD pin after a complete byte has been demodulated At the same time it will take its DCDN pin low There is a 24 byte message buffer in the CMX866 receive path but as the received data always arrives at slower than 9600 baud there is no need for a flow control handshake in the receive path It is assumed that the external uController will absorb all of the data presented to it without the need for flow control and will ignore continuous mark stop bits when there is no received data If the received signal is below the detection threshold or the DE8661 is not
6. in seconds 0s 19 Reserved for test functions 20 Reserved S21 0 255 Loopback and Power states 10 22 0 255 Calling and response characteristics selection CO S Registers Parameters Function Default 23 0 255 Guard tone selection 00 24 0 255 Equaliser DCD DTR status and modulation fallback A9 S25 0 255 Tx Gain Tx data format BO S26 0 255 Rx Gain Rx data format overspeed 2 3 default setting 30 S27 0 255 Communications Protocol 00 28 0 255 RTSN Timeout for return to Command mode from Data mode in seconds Os 29 0 255 Timed Break Recall period in centiseconds 300ms Xn Register Parameter Calling and Response Characteristics n Mapped to S22 register 0 Ignore dial tones and busy tones return CONNECTxxxx or NO CARRIER 1 Ignore busy tone wait for dial tone to dial Return NO DIAL TONE or CONNECT xxxx or NO CARRIER 2 Ignore dial tone If busy tone detected return BUSY Return CONNECT xxxx 3 Return NO DIAL TONE BUSY CONNECT xxxx or NO CARRIER 2004 CML Microsystems Plc 16 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 amp Dn Register Parameter DTR action n Mapped to S24 register 0 Ignore DTR signal 1 Go to command state when on to off transition occurs 2 Hang up and go to command state when on to off transition occurs amp Gn Register Parameter Guard Tone action n Mapped to S23 register 0 Disabled
7. 00 11 CONNECT 1200 75 12 CONNECT 75 1200 13 CONNECT 1200 150 14 CONNECT 150 1200 15 NYI Not Yet Implemented 1 6 7 Terminal Emulator If using a terminal emulator to control the DE8661 HyperTerminal which is supplied with the Windows 95 NT installations is suitable for this purpose HyperTerminal Setup Emulation VT100 ASCII Character set ASCII Receiving Wrap lines that exceed terminal width COM Port Settings Bits per second 9600 Data bits 8 Parity None Stop bits 1 Flow Control Hardware Some terminal emulators have been found not to support full hardware flow control when transferring text files This could result in data loss when using this facility If this problem is experienced users should try using a different terminal emulator 2004 CML Microsystems Plc 18 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 To ensure successful negotiation and data transfer between the DE8661 and third party modems users should ensure their third party modem is configured to the correct protocol see third party AT command documentation Note any sudden loss of the 2 wire line during data transfer will result in loss of carrier and therefore the demonstration board will hang up and display the NO CARRIER message However due to the lost carrier to hang up delay S10 a short burst of corrupt characters noise generated will be observed on the HyperTerminal window before the NO CARRIER message is displayed T
8. CML Microcircuits y 22bis User Manual COMMUNICATION SEMICONDUCTORS for a socket modem UM8661 4 June 2004 Provisional Issue 1 0 Features e CMX866 based socket modem Reference Design FCC68 or CTR21 DAA e Fully Isolated 2 Wire Line Interface e Single 3V or 5V dc power supply operation e Opto Isolated Ring Detect Circuitry and e Break off PCB sections support OptoMOS Hook Relay desktop and socket modem use e Integral AT Command Set with Fast Connect e PCB layout data provided e PC Controlled via Terminal Emulator 1 4 Brief Description The DE8661 Demonstration Board is a reference design for the CMX866 V 22 bis AT command modem IC The main socket modem section contains the CMX866 and associated components in addition to the line interface components Attached to the main section are two break off sections which contain a 9 pin D type socket for PC serial communications RJ11 line connector supply voltage connector and a hook state LED The CMX866 contains an on chip uController which interprets AT Commands issued via a standard terminal emulator program running on a host PC or via an external uController Interfacing to the Demonstration Board can be via socket pins on the socket modem section or via the connectors provided on the break off sections The board can be operated at 3V or 5V dc which must be provided by an external regulated power supply The PCB has been laid out for both CTR21 and FCC68 compliant DAA designs
9. However the components fitted are for the simplified European FCC68 design Users wishing to convert to CTR21 should contact CML 2004 CML Microsystems Plc DE8661 Reference Design and Demonstration Board CONTENTS Section 1 0 Features oreet rere irn E rnR ERE 1 1 Brief Description diria rina rari 1 2 Preliminary Information eeeeeeneeeeee 1 2 1 Equipment erectus 1 2 2 Handling Precautions ees 1 2 3 Approvals rrt E ERER HRS 1 3 Quick Start coe e eee exe enn 1 3 1 Setting Up iceneiineieeneteee 1 3 2 Operation eren henhnh 1 4 Signal Eists 5 ener 1 5 Circuit Schematics and Board Layout 1 6 Detailed Description eeeeeeeeeseeeee 1 6 1 Hardware Description 1 6 2 Serial Interface a n 1 6 3 Reset Function cesses 1 6 4 AT Command and S Register Summary 1 6 5 General Description of AT Commands 1 6 6 Modem Result Codes esee 1 6 7 Terminal Emulator eene 1 7 Performance Specification sssss 1 7 4 Electrical Performance esee 2004 CML Microsystems Plc 2 DE8661 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 Modem or Telephone Line Sim
10. J35 TXDTTL J34 RXDTTL J33 RTSTTL Figure 2 Socket Section Pinout topview UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 Figure 3a DE8661 Top Silk Screen Figure 3b DE8661 Bottom Silk Screen 2004 CML Microsystems Plc 10 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 1 6 Detailed Description 1 6 4 Hardware Description 1 6 1 1 Operating Voltage The DE8661 can be operated at a VDD of 3 or 5Vdc default supplied by an external regulated power supply Tables of component values for CTR21 and FCC68 DAAs are shown below CTR21 DAA VDD R6 R7 C24 R12 D1 3 0V 91K 93 5k 160k 180pF 220R 3 0V 5 0 V 56K 57 6k 180k 220pF 620R 4 3V FCC68 DAA VDD R6 R7 C24 R12 D1 3 0V 100K 107k 160k 39pF 220R 3 0V 5 0 V 62K 64 9k 180k 47pF 620R 4 3V The values shown in brackets are optimal values 1 6 1 2 Clock Oscillator The CMX866 is clocked at a frequency of 11 0592MHz which is provid
11. command The modem line speed is much lower than the speed of the RS232 interface RS232 is running at 9600bps To prevent the CMX866 internal data buffer from overflowing the data flow between the host system and the RS232 interface on the DE8661 is controlled using the CTS Clear to Send hardware handshake line The CMX866 settings used during negotiation and data transfer will be based on the contents of the S registers when the call was originated or answered The S registers are described in Section 1 6 4 Certain S register settings relevant to the CMX866 configuration modified during on line AT command mode will only take effect when a new call is originated or answered For example new CMX866 Tx gain settings S25 register modified in on line AT command mode will be ignored until the next call 2004 CML Microsystems Plc 6 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 1 4 SignalLists CONNECTOR PINOUT Ref Pin No Name Type Socket pin Tip Bi Socket pin Ring Bi RJ11 connector Ring Bi RJ11 connector Tip Output 9 pin D Type connector Host DCD Output 9 pin D Type connector Host RXD Input 9 pin D Type connector Host TXD Input 9 pin D Type connector Host DTR Power 9 pin D Type connector Host GND Output 9 pin D Type connector Host DSR Input 9 pin D Type connector Host RTS Output 9 pin D Type connector Host CTS oO ON Oa FW NY A OQ Output 9 pin D Type con
12. ed by crystal X1 1 6 1 3 On hook Caller ID This function provides a high impedance on hook AC path for the routing of Caller ID signals to the CMX868 Components C9 R5 provide this transmission path C9 bypasses the optoMOS relay hook switch allowing AC signals to pass through T1 when the socket modem is in an on hook state The CMX866 has a switched inverting input pin 11 which is used to compensate for input signal losses incurred while in the on hook state 1 6 1 4 Simplified FCC68 Compliant DAA as Shipped The values of R4 R6 R7 R8 R9 C8 and C24 are optimal values with respect to the Midcom 82111 wet line transformer Parts C10 and D4 are not required for this simplified design but are replaced with 0Q links 1 6 1 5 CTR21 Compliant DAA Components R10 R11 C11 D4 D5 U4 and U5 may be fitted to provide a 60mA current limit required by CTR21 An alternative wet line transformer the Midcom 82107 must be fitted Parts C10 C24 and R6 also have different values to match the characteristics of the 82107 transformer and the CTR21 reference impedance 2004 CML Microsystems Plc 11 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 1 6 1 6 1 6 1 7 1 6 2 Line Protection Line protection is provided by the Sidactor component E1 Sidactor is the trade name for a type of Transient Voltage Suppressor TVS manufactured by Teccor Electronics Ring Detection The ring detect threshold is approximately 20VRMS
13. hese corrupt characters can sometimes match control characters and therefore modify HyperTerminal s behaviour The user is advised to restart HyperTerminal if this happens 2004 CML Microsystems Plc 19 UM8661 4 DE8661 DE8661 Reference Design and Demonstration Board 1 7 Performance Specification 1 7 4 Electrical Performance 1 7 1 1 Absolute Maximum Ratings Exceeding these maximum ratings can result in damage to the DE8661 Max Units Vien 0 3 Min Supply Vpp Vss 0 3 Voltage on any connector pin to Vss 0 3 Current into or out of any socket modem connector pin 20 other than Vpp Vss TIP and RING 1 7 1 2 Operating Limits Correct operation of the DE8661 outside these limits is not implied 20 Max mA Units Notes Min 5 5 Supply Vpp Vss 2 7 1 7 1 3 Operating Characteristics For the following conditions unless otherwise specified Evaluation Device Xtal Frequency 11 0592MHz 0 01 100ppm VDD 3 0V or 5 0V Tamb 25 C Max Units Notes Min Typ DC Parameters IDD socket modem alone idle 10 IDD demonstration board idle 1 18 Notes 1 Hook LED off 2004 CML Microsystems Plc 20 mA UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 CML does not assume any responsibility for the use of any circuitry described No IPR or circuit patent licences are implied CML reserves the right at any time without notice to change the said circuitry and
14. in Data Transfer mode the CMX866 will take its DCDN and RXD pins high If the CMX866 receives a RING signal on the RD and RT pins such that the detection threshold is exceeded then this condition will be signalled to the external uController by the CMX866 taking its RIN pin low This pin follows the output of the ring detector so will go low for each burst of RING signal If the CMX866 is in a Powersave or Zero Power state it will be woken up and the DSRN pin will go low once the on chip pu Controller is ready to receive communications through the serial port This wake up process takes about 30ms from Zero Power state as the VBIAS pin has to charge the external reservoir capacitor and the crystal oscillator has to start up 2004 CML Microsystems Plc 12 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 1 6 3 and stabilise before the CMX866 can initialise itself From the Powersave state this wake up process takes about 10us as the oscillator and the VBIAS pin are already stable The CMX866 DSRN and DTRN pins do not act as a handshake with the external Controller The DSRN pin indicates the operational status of the on chip Controller low ready to communicate with an external uController The DTRN pin is used for taking the CMX866 out of Powersave or Zero Power state It effectively acts as a device wake up in the same manner as the RING signal and becomes active on the high to low transition A high to low tran
15. is ignored Information transfer can only restart when the RTSN pin is taken low again and the CMX866 responds by taking CTSN low Reset Function The CMX866 as fitted to the DE8661 has an internal power up reset function which is activated whenever power is applied to the board This reset function resets all of the on chip uController registers including the S Register settings and then performs an initialisation sequence which resets the internal DSP and subsequently places it in a powersave state loads the factory default values into the S Registers and places the on chip pu Controller into an operating state This internal power up reset function is OR ed with the RESETN pin When the RESETN pin is taken low i e SW1 on the break off section is activated or a low signal is applied to pin 24 of the DE8661 the reset operation described above is performed When the CMX866 first enters the operating state it reports its configuration as follows CMX866 waits for DTRN to go active low to wake up the device CMX866 takes the DSRN pin active low to indicate its readiness to communicate with an external uController CMX866 waits for RTSN to go active low CMX866 sends CMX866 identification message to external p Controller equivalent to the external Controller issuing an ATIO command The on chip uController now powers up the DSP part of the CMX866 The DSP is automatically reset then requested to perform an internal diagnostic se
16. lf check which takes about 2 9ms to complete On successful completion CMX866 sends DSP checksum OK identification message to the external yu Controller If not successful CMX866 sends DSP Error message to the 2004 CML Microsystems Plc 13 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 external Controller In the latter case the CMX866 should be reset again by taking the RESETN pin low e The on chip pController now powers down the DSP part of the CMX866 e The on chip Controller is now in the Command mode operating state and is ready to accept AT commands from the serial interface approximately 55ms after DTRN goes low e CMX866 takes the CTSN pin active low to indicate its readiness to communicate with an external uController 2004 CML Microsystems Plc 14 UM8661 4 DE8661 Reference Design and Demonstration Board 1 6 4 AT Command and S Register Summary DE8661 AT Command Parameters Function Default A Answer Command Answer and establish a connection when off hook Al Re execute last command Select Communications Standard Mapped to S27 n 0 V 22bis 2400bps QAM n 1 V 22 1200bps DPSK n 2 V 23 Tx 75bps Rx 1200bps Master Bn n 0 9 n 3 V 23 Tx 1200bps Rx 75bps Slave n 0 n 4 Reserved n 5 V 21 300bps FSK n 6 Bell 212A 1200bps DPSK n 7 Bell 202 Tx 150bps Rx 1200bps n 7 8 Be
17. ll 202 Tx 1200bps Rx 150bps n 9 Bell 103 300bps FSK Dn n n 0 9 A D Dial Command DTMF dials the subsequent Directory Number or DTn n j Dial Command Modifier Delay during dialling time in S8 register Dial Command Modifier Send a line break time in S29 register Dial Command Modifier command mode after dialling no handshake DL Dial Command Redial last number En n 2 0 1 Command echo O off 1 0n n 1 Hn n 0 1 Switch Hook Control O on hook 1 off hook n 0 In n 0 Identification Returns the modem s product identification Nn n 0 1 V 22bis Fallback to V 22 option O none 1 automatic n 1 O Go online in Data mode from Command mode Qn n 0 1 Enable n 0 Disable n 1 return of modem result codes n 0 RO Execute V 23 or Bell 202 turnaround if enabled see S14 and S24 then go online in Data mode AT Command Parameters Function Default Sn n 0 29 S Register n Read Display specified S Register contents Sn x n 0 29 S Register n Write Write to specified S Register Vn n 720 1 Return result codes as numbers n 0 or words n 1 n 0 Xn n 0 3 Calling and Response Characteristics n 3 Z Restore factory profile for CMX866 amp Cn n 0 1 DCD always on n 0 or DCD follows carrier n 1 n 1 amp Dn n 0 2 DTR signal procedure n 2 amp Gn n 0 2 Guard Tone Select Disable n 0 Enable 550Hz n 1 or 1800Hz n 2 n 0 amp Tn n 0 3 6 User accessible Loopback Tests and Diagnostics n 0 amp V Returns current configuration amp
18. nector Host RI RESET Input Socket pin CMX866 reset VSS Power VSS connection N C N C N C N C RTSTTL Input Socket pin CMX866 RTSN RXDTTL Output Socket pin CMX866 RXD TXDTTL Input Socket pin CMX866 TXD RITTL Output Socket pin CMX866 RIN DSRTTL Output Socket pin CMX866 DSRN ICTSTTL Output Socket pin CMX866 CTSN DCDTTL Output Socket pin CMX866 DCDN DTRTTL Input Socket pin CMX866 DTRN Vss Power Vss connection VDD Power ve power from external power supply N C N C 2004 CML Microsystems Plc 7 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 LED Ee Illuminated when the line is in an off hook state JUMPERS Jumper Default Description Ref Position P RS232 Receiver enable U8 JP4 1 2 O C Allows a supply voltage to be physically connected to the top side of the PCB Notes Bi Bidirectional S C Short Circuit O C Open Circuit N C Not Connected 2004 CML Microsystems Plc 8 UM8661 4 DE8661 Reference Design and Demonstration Board 1 5 Circuit Schematics and Board Layout DE8661 For clarity circuit schematics are available as separate high resolution files TIP J1 RING J2 RESET J24 2004 CML Microsystems Plc GND J26 N C J29 N C J30 N C J31 N C J32 OO cho oO r O 9 a e O O O O O O O O J63 N C J62 N C J61 VDD J41 GND J40 DTRTTL J39 DCDTTL J38 CTSTTL J37 DSRTTL J36 RITTL
19. ng functions before a connection to a remote modem simulator can be established Negotiation may be aborted by pushing any key 2004 CML Microsystems Plc 5 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 Note If the SO register is modified to a non zero value during this operating mode the CMX866 will poll its status register every 20ms to check for ring detection If valid ringing is detected the DE8661 will automatically answer a call after n ring cycles where n is equivalent to the contents of the SO register Data Transfer Mode After gaining a connection i e successful negotiation with a remote modem the board will operate in data transfer mode In this mode the board will transmit all the data it receives from the RS232 computer terminal or external wController to the remote modem via the 2 wire line Likewise any data received from the remote modem via the 2 wire line will be sent to the RS232 computer terminal or external Controller Whilst operating in this mode the data stream from the RS232 computer terminal or external uController is monitored for the escape code sequence If this sequence is encountered during data transfer the board will revert to on line AT command mode Whilst in on line AT command mode the remote modem connection may be aborted by typing ATHO instructs the DE8661 to go on hook Alternatively the user can enter relevant AT commands or return to data transfer mode by using the ATO
20. periment immediately with the demonstration board A fuller description of the board and its use appears later in this document Setting Up THE DE8661 COMES PRE CONFIGURED AS AN FCC68 MODEM USING THE CMX866 D6 28 pin SSOP DEVICE FOR OPERATION AT 5 0 VOLTS See section 1 6 for the alternative component values required for 3 0V or CTR21 operation An RJ11 US style phone jack socket J3 for 2 wire line connection is provided on one of the break off board sections Power can be connected via socket pins 61 VDD and 41 GND see figure 2 0 section 1 5 or via jumper JP4 on the break off section Attach the 9 way RS232 cable between connector J4 and the serial port of the PC Connect an external modem line simulator to the evaluation kit using a suitable RJ11 telephone cable not supplied The DE8661 is supplied with the break off sections of the board intact If a socket modem using the industry standard footprint is required detach these break off sections from the Demonstration Board PCB by using a suitable tool to scribe along the perforations that join the break off sections to the main PCB Scribe on both top and bottom sides of the board and ensure that the scribed line completely cuts any copper tracks entering or leaving the break off sections from the main PCB When this is done gently break off the first section on which connector J4 9 pin D Type socket is mounted then break off the second section on which the RJ11 socket is moun
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22. sition on the DTRN pin is ignored if the device is already woken up If the external uController does not have a DTR signal the DTRN pin should be permanently wired to the TXD pin When the CMX866 is in a Powersave or Zero Power state the RXD CTSN DSRN DCDN and RIN pins will be permanently high The condition of the TXD RTSN and DTRN pins is not important Depending on the amp Dn configuration if the DTRN pin on the CMX866 is taken high at any time whilst the DE8661 is in Data Transfer mode a fixed 100ms timeout is started On completion of the timeout the DE8661 will return to AT Command mode enabling further AT commands to be sent If the DTRN pin goes high whilst the DE8661 is in AT Command mode the action is ignored AT commands can be sent providing CTSN and RTSN are low ie DTRN can be either high or low A low to high transition on the ESC pin also has the same effect of returning the DE8661 from Data Transfer mode to Command mode but with immediate effect The amp Dn command configures these options see section 1 5 4 4 for more details If the RTSN pin of the CMX866 is taken high at any time whilst the DE8661 is in Data Transfer mode a timeout is started whose value is set in the S28 register 0 timeout disabled On completion of the timeout the DE8661 will return to AT Command mode and take CTSN high If the RTSN pin goes high whilst the DE8661 is in AT Command mode the CTSN pin goes high and the action on the RTSN pin
23. ted All connections to the remaining socket modem must now be made through the PCB connector pins Operation The DE8661 demonstration board allows the user to perform calling answering and simple data transfer with an external third party modem not supplied In order to provide central office exchange dc line voltage a suitable central office simulator is also required The board is controlled by the AT command set described in Section 1 6 4 These commands can be sent to the DE8661 from a terminal emulator program running on a host PC or from an external uController A suitable emulator is the HyperTerminal program which operates under Windows 95 upwards The DE8661 AT command set consists of Basic Extended and CML Specific commands The board has two modes of operation AT Command Mode In this mode the CMX866 on chip AT command processor checks to see if the user has typed a valid AT command When a valid command is received it is interpreted then actioned by the CMX866 When operating in this mode the user can instruct the DE8661 to manually answer a call originate a call go on off hook read write to S registers issue CML specific AT commands and perform any number of other AT command functions The board always starts in AT Command mode after power is applied and board initialisation is complete The Dial and Answer commands will execute the relevant DTMF transmit call progress tone detection and negotiation handshaki
24. ulator DE8661 J26 J41 RS232 Cable Figure 1 System Diagram 2004 CML Microsystems Plc 3 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 1 2 1 2 1 1 2 1 1 1 2 1 2 1 2 2 1 2 2 1 1 2 2 2 1 2 3 Preliminary Information Equipment The following equipment is needed to use this demonstration board 3Vdc or 5Vdc Regulated Power Supply A PC equipped with a serial port running a terminal emulation program such as Microsoft s HyperTerminal Handling Precautions Static Protection This product uses low power CMOS circuits which can be damaged by electrostatic discharge Partially damaged circuits can function erroneously leading to misleading results Observe ESD precautions at all times when handling this product Contents Unpacking Please ensure that you have received all of the items on the separate information sheet EK8661 and notify CML within 7 working days if the delivery is incomplete Approvals This product is designed to meet CTR21 or FCC68 telecom approval requirements Users are advised to observe local statutory requirements which may apply to this product before direct or indirect connection to any public telecommunication system 2004 CML Microsystems Plc 4 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 1 3 1 3 1 1 3 2 Quick Start This section provides instructions for users who wish to ex
25. y All characters in the AT command including the AT and CR terminator are echoed if E1 is set by the DE8661 in the order in which they are sent by the external Controller If when entering an AT command no command or register name suffix is supplied a suffix of zero is assumed If when changing a register value no value is supplied a value of zero or an empty string is assumed i e ATSO lt CR gt is equivalent to ATSO 0 lt CR gt 2004 CML Microsystems Plc 17 UM8661 4 DE8661 Reference Design and Demonstration Board DE8661 Receipt of a back space will cause the DE8661 to send a backspace space backspace sequence of characters to the external Controller to allow any terminal which may be connected to the latter to clear its screen of the last character Also the last character received will be discarded unless the last characters received were AT ie the AT is never deleted The escape sequence with Guard Time 1s see S12 register before and after the sequence will cause the DE8661 to enter AT Command mode from Data Transfer mode and to return an OK response A detailed description of AT commands and S Registers can be found in the CMX866 Data Sheet available from the CML website 1 6 6 Modem Result Codes Numeric Response Decimal Alpha Response 00 OK 01 CONNECT 02 RING 03 NO CARRIER 04 ERROR 05 NO DIAL TONE 06 BUSY 07 CONNECT 2400 08 CONNECT 1200 09 DUAL TONE DETECT 10 CONNECT 3

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