73M2901CE Worldwide Modem Demo Board

Transcription

1 73M2901CE Worldwide Modem Demo Board USER S MANUAL July 15, 2005 Version 1.5 TERIDIAN Semiconductor Corporation 6440 Oak Canyon Rd. Irvine, CA Ph: Fax: (714) Page: 1 of TERIDIAN Semiconductor Corporation Rev 1.5

2 73M2901CE Evaluation Board User s Manual Revision History Revision # Date Description 1.0 September 28, 2004 Document creation /12/04 Initial release version /21/04 Additional information in section 5, minor edits /1/04 Add table /21/05 Correct polarity of RELAY connection to optocoupler in schematic 1.5 7/15/05 Add new logo TERIDIAN Semiconductor Corporation makes no warranty for the use of its products, other than expressly contained in the Company s warranty detailed in the TERIDIAN Semiconductor Corporation standard Terms and Conditions. The company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice and does not make any commitment to update the information contained herein. Page: 2 of TERIDIAN Semiconductor Corporation Rev 1.5

3 73M2901CE Worldwide Demo Board User s Manual 73M2901CE WORLDWIDE MODEM DEMO BOARD USER S MANUAL Page 3 of 74

4 73M2901CE Evaluation Board User s Manual Table of Contents 1 GETTING STARTED GENERAL GETTING STARTED Recommended Operating Conditions and Absolute Maximum Ratings DESIGN CONSIDERATIONS GENERAL LAYOUT RULES USING THE 73M2901CE WORLDWIDE DEMO BOARD: NEW FEATURES INTRODUCTION SMS AND V.23 HALF DUPLEX LEASED LINE MODE M2901CE ENERGY RING DETECTION CALLER ID MODE CHANGES SELECTABLE ANSWER TONE FREQUENCY DETECTION OTHER S REGISTER ADDITIONS AND CHANGES S118 - Caller ID Ring Interrupt Delay S119 - Wait Before Connect S121 - Answer Tone Qualify Time S122 - Parallel Pick Up debounce timer USING THE 73M2901CE WORLDWIDE DEMO BOARD: AT COMMAND SET THE AT COMMAND SET AT Commands Overview AT COMMANDS A - Answer A/ - Repeat Last Command B - Bell, ITU, V.23, or Bell202 Operation C[n] - Select Carrier Detect Option D[n...n] - Dialing String E[n] - Echo Commands On/Off F- Load Factory Defaults G - Guard Tone Select H[n] - On-Hook/Off-Hook Control I[n] - Identification and ROM Tests J[n] - PTT Test K[n] - Flow Control L[n] Fast Connect N[n] - Data Set Ready Signal Control O[n] - return to On-Line P - Pulse Dial Q[n] - Result Codes On/Off R[n] - Select Data Terminal Ready Option S[r] - Modify/Read S Registers T - Tone Dialing V[n] - Select Result Codes Numbers/Words W[n] - Select Extended Result Code X[n] - Select Result Code Set Y[n] - Selects asynchronous or synchronous modes Z - Reset Modem AT EXTENDED AT COMMANDS Modify/Read MAC RAM Memory Value Page: 4 of TERIDIAN Semiconductor Corporation Rev 1.5

5 73M2901CE Worldwide Demo Board User s Manual - Modify/Read IRAM Memory Value Set Lease Line Operation Alternate Pulse Dial Make/Break Ratio Select Test Mode Power Down S-REGISTER OVERVIEW Setting S Registers Reading S Registers Setting/Reading S Registers While in Online Command Mode S REGISTERS S0 - AutoAnswer S1 - Ring Count S2 - Escape Code Character S3 - Carriage Return Character S4 - Line Feed Character S5 - Backspace Character S6 - Wait to Blind Dial S7 - Wait For Carrier After Dialing S8 - Pause Time For Comma S9 - Carrier Detect Response Time S10 - Lost Carrier To Hang Up Delay S11 - DTMF Dialing Speed S12 - DTMF / Twist Dial Register S13 - DTMF Transmit Attenuation S14 - Bit Mapped Register S15 - Calling Tone Off Time S16 - Calling Tone On Time S17 - Minimum Ring Frequency Register S18 - Maximum Ring Frequency Register S19 - Dial Tone & Busy precise tones bit mask S20 - Call Progress Tones detect type S21 - Bit Mapped Register S22 - Bit Mapped Register S23 - Busy Detect Cadence Count S24 - Desired DCE Speed S25 - Protocol Selection Register S26 - Bit Mapped Data Mode Control Register S27 - Call Progress Transmit Register S28 - Fast Connect, and Calling Tone Enable S29 - Extended Result Selection / Cadence Type Selection S30 - Bit Mapped Handshake Register S31 - Bit Mapped Connect Detect Register S32 - Pulse Dial Make Timer S33 - Pulse Dial Break Timer S34 - Pulse Dial Inter-digit Timer S35 - Cadence A Min On Time of Dial tone S36 - Cadence A Max On Time of Dial tone S37 - Cadence A Min Off Time of Dial tone S38 - Cadence A Max Off Time of Dial tone S39 - Cadence B Min On Time of Dial tone S40 - Cadence B Max On Time of Dial tone S41 - Cadence B Min Off Time of Dial tone S42 - Cadence B Max Off Time of Dial tone S43 - Cadence A Min On Time of Busy S44 - Cadence A Max On Time of Busy S45 - Cadence A Min Off Time of Busy S46 - Cadence A Max Off Time of Busy S47 - Cadence B Min On Time of Busy S48 - Cadence B Max On Time of Busy S49 - Cadence B Min Off Time of Busy S50 - Cadence B Max Off Time of Busy S51 - Cadence A Min On Time of Ring S52 - Cadence A Max On Time of Ring Page 5 of 74

6 73M2901CE Evaluation Board User s Manual S53 - Cadence A Min Off Time of Ring S54 - Cadence A Max Off Time of Ring S55 - Cadence B Min On Time of Ring S56 - Cadence B Max On Time of Ring S57 - Cadence B Min Off Time of Ring S58 - Cadence B Max Off Time of Ring S59 - Bit Mapped Register S60 - Bit Mapped Test Control Register S61 - Signal Detect Register S62 - Signal Detect Register S63 - Precise Call Progress Detect S64 - Signal Quality S65 - DTMF Detect Register S66 - Wait for Dialtone S67 - Qualify Dialtone S68 - Test Timer S69 - Test Error Count S70 - Auto Retrain Threshold S71 - Originate Mode Fallback Timer S72 - Pulse Map, Caller-ID, BlackList S73 - Configuration Register S74 - Billing Delay Register S75 - Pre-Dial Call Progress Imprecise Detect Level S76 - Post-Dial Call Progress Imprecise Detect Level S77 - Pre-Dial Call Progress Precise Detect Level S78 - Post-Dial Call Progress Precise Detect Level S79 - FSK Originate Carrier Detect Level S80 - FSK Answer Carrier Detect Level S81 - dpsk Originate Carrier Detect Level S82 - DPSK Answer Carrier Detect Level S83 - QAM Originate Carrier Detect Level S84 - QAM Answer Carrier Detect Level S85 - DTMF Transmit Level S86 - Flash On Time (!) S87 - Flash Off Time (!) S88 - Imprecise Filter Selection S89 - Data Set Ready S90 - RTS to CTS Turn-around Delay S91 - Call Progress Transmit Level S92 - Bit Mapped Register S93 - Ring Interval Register S94 - TIES Escape Prompt Delay Timer Register S95 - Caller-ID Configuration Register S99 - Country Codes Register S100 - Idir S101 - USR1x I/O S102 - Direction control for USR1x S103 - USR2x I/o S104 - Direction control for USR2x S105 - Delay after any Call attempt S106 - Delay between 1 st and 2 nd attempt S107 - Delay between n th and n+1 th attempt S108 - Maximum successive Failed attempts S109 - Delay between series (Re-enable delay) S110 - Line-In-Use Configuration register S111 - Line-In-Use Settle time S112 - Line-In-Use Energy detection Wait S113 - Line-In-Use Energy detection Threshold S116 - Parallel-Pick-Up Energy detection Threshold S117 - No activity timeout S118 - Caller ID Ring Interrupt Delay S119 - Wait Before Connect S120 - Accepted Answer Tone Frequencies S121 - Answer Tone Qualify Time Page: 6 of TERIDIAN Semiconductor Corporation Rev 1.5

7 73M2901CE Worldwide Demo Board User s Manual S122 - Parallel Pick Up debounce timer S123 - Soft Ring Detect S124 - V23 Half Duplex Enable WORLD-WIDE MODEM DESIGNS WITH THE 73M2901CE WORLDWIDE DEMO BOARD OVERVIEW USING THE 73M2901CE CTR-21 DEMO BOARD M2901CE S99 COUNTRY CODE SUPPORT RIng detection parameters Dial tone parameters busy tone parameters Pulse dialing DTMF dialing Calling tone Call progess and data carrier transmit levels Caller Id type I and type II itu answer tone phase reversals bps fast connect mode USING THE 73M2901CE WORLDWIDE DEMO BOARD: HARDWARE DESIGN SCHEMATIC DIAGRAMS M2901CE DEMO BOARD PIN DESCRIPTION PCB LAYOUT PINOUTS (QFN AND TQFP PACKAGES TOP VIEW) APPENDIX DC LOOP CIRCUIT SCHEMATIC S99 COUNTRY SELECT S REGISTER SETTINGS USEFUL SOURCES Page 7 of 74

8 73M2901CE Evaluation Board User s Manual List of Figures Figure 1-1 TERIDIAN 73M2901CE Worldwide Demo Board: Basic Connections Figure 3-1 Approximate Thresholds for Energy Ring Detection Figure 6-1 TERIDIAN 73M2901CE Worldwide Demo Board: Daughter Board Schematic Figure 6-2 TERIDIAN 73M2901CE Worldwide Demo Board: Mother Board Schematic Figure M2901CE Worldwide Daughter Board Pin Connections Figure 6-4TERIDIAN 73M2901CE Worldwide Demo Board Demo Board: Bottom Layer Figure 6-5 TERIDIAN 73M2901CE Worldwide Demo Board Demo Board: Top Layer Figure 6-6 TERIDIAN 73M2901CE Worldwide Demo Board: Top Silk Screen Figure 7-1 Simple DC Loop Simulator List of Tables Table 1-1 Recommended Operating Conditions Table 1-2 Absolute Maximum Ratings Table 5-1 S Register Settings for Worldwide Modem Design in Figure Table 5-2 Termination Impedance Network Values Table 5-3 Worldwide Country AC Impedance Requirements Table M2901 Worldwide Demo Board Description: Digital Interface Table M2901 Worldwide Demo Board Description: Telephone Network Interface Table M2901 Worldwide Demo Board Description: DB-25 RS-232 Level Serial Interface Table 6-4 TERIDIAN 73M2901CE Worldwide Demo Board: Bill of Material Table 7-1 S99 Country Code S Register Settings Table 7-2 S99 Country Code Settings continued Table 7-3 Worldwide Termination Impedance Requirements Page: 8 of TERIDIAN Semiconductor Corporation Rev 1.5

9 73M2901CE Worldwide Demo Board User s Manual 1 1 GETTING STARTED 1.1 GENERAL The TERIDIAN Semiconductor Corporation (TSC) 73M2901CE Worldwide Demo Board is a platform for evaluating TERIDIAN 73M2901CE single chip modem ICs. It incorporates the 73M2901CE integrated circuit, and it has been designed to operate with a PC using the serial COM1 or COM2 RS-232-level ports and standard communications software packages such as Hyperterminal. The board has been designed to comply with U.S. Part 68, CTR-21, and AS/ACIF S002: GETTING STARTED The Figure 1-1 shows the basic connections of the Demo Board. - Use the supplied motherboard and 5V power supply. - The motherboard includes a 3.3V regulator to power the 73M2901CE Worldwide Demo Board. - The motherboard also includes RS-232 level shifters and DCE connector to connect the demo board to a PC or other terminal device. - Use a standard PC terminal emulation program to communicate with the 73M2901CE Worldwide Demo Board. See the separate 73M2901CE User Guide for a complete list of commands. o Type AT <CR> on the terminal at any speed from 1200 bps to 9.6 Kbps to verify communication with the modem. The 73M2901 modem will return OK if communication is properly established. - Connect the RJ-11 connector to a telephone network emulator or private branch exchange (BPX). The demo board, although meeting all the required telecom standards, is not a certified device. Therefore the 73M2901CE Worldwide Demo Board should not be connected to the outside telephone network. o Telephone network emulators are available from Teltone Corp., and Rochelle Communications, Inc. among others. See appendix for contact information. o Other network emulators from PTT, TAS Telecom, and Consultronics may be available on the used equipment market. These offer higher levels of performance, but service availability is questionable. - It is not possible to connect two 73M2901CE demo boards back to back to test their operation. DC loop current is needed to activate the network-side circuitry. A simple current mirror current source circuit can be used to provide the required DC loop current. A simple circuit is shown in Figure 6-6. This circuit supplies two independent sources, one for each modem. The loop current provided is approximately 20 ma to each modem. This circuit does not provide network impairments, call progress signals, or attenuation, which are also typically used for modem testing. Page 9 of 74

10 73M2901CE Evaluation Board User s Manual RECOMMENDED OPERATING CONDITIONS AND ABSOLUTE MAXIMUM RATINGS Table 1-1 Recommended Operating Conditions PARAMETER CONDITIONS RATING Supply Voltage V DD At the demo board power pins 2.7 to 3.6 VDC Supply Voltage V PC At the mother board power connector 4.75 to 5.5 VDC Ambient Operating Temperature Without condensation or icing -40 C to +85 C Input Voltage for Digital Inputs 0V to V DD + 0.3V Table 1-2 Absolute Maximum Ratings PARAMETER RATING Supply Voltage V DD Supply Voltage V PC Input Voltage for Digital Inputs -0.5 to 4.0 VDC -0.5 to 6.0 VDC -0.3 to (VDD+0.5) VDC Storage Temperature -60 to 150 C Pin Voltage -0.3 to 5.5V VDC ESD Tolerance Other pins +/- 2kV Operation outside these rating limits may cause permanent damage to the device. Page: 10 of TERIDIAN Semiconductor Corporation Rev 1.5

11 73M2901CE Worldwide Demo Board User s Manual Figure 1-1 TERIDIAN 73M2901CE Worldwide Demo Board: Basic Connections Page 11 of 74

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13 73M2901CE Worldwide Demo Board User s Manual 2 2 DESIGN CONSIDERATIONS 2.1 GENERAL LAYOUT RULES Keep OSCIN and OSCOUT signals as short as possible and locate the crystal near the pins. Use an MHz parallel mode crystal only. Do not use ground planes under the oscillator circuit since this will increase the parasitic capacitance on the pins. The values of C2 and C3 depend on the load capacitance rating of the crystal that is used, not the 73M2901CE. This load capacitance will typically be between 15 pf and 27pF, but usually 18 or 22 pf. Parallel resonant crystals are tuned with a specific capacitive load and will be within their specifications when this load is used. This rating is the capacitance measured between the crystal pins including all parasitic capacitances. It is not the values of the capacitors used. The selection of these capacitors can vary with the layout of the PCB, so do not assume the values used with the 73M2901CE demo board are correct for all designs. System noise is the most likely cause of poor Caller ID and low-level receive performance. The lowest amplitude signals that the modem will need to receive are on the order of 5mV rms. The Caller ID receive levels are also very low due to the requirement to have a high (60K Ω) AC input impedance while on hook. Having a 20 db gain boost during Caller ID reception compensates for this, but if there is excessive noise, it will also be amplified. Keeping the analog and digital grounds separate helps control the amount of noise that gets to the receiver input. Dramatic improvements in low-level performance can be gained by proper layout. Keep the VCC trace as short as possible. Make the power trace a minimum of 0.5mm thick. The analog and digital power and ground should be kept separate for best low receive level performance. Route the power to the digital pins and bypass capacitors on one net and the analog power and VBG bypass pins on another net with inductors separating the two. If power planes are used, separate the power and ground planes so there are separate analog and digital planes for the 73M2901CE. Keep 0.1µF and 3.3µF bypass capacitors close to VPD power pins of the device and take other end to the digital ground. Keep 0.1µF and 10 µf bypass capacitors close to VPA power pin of the device and directly connect the other end to analog ground. Keep all analog signaling away from any high-speed digital circuitry and traces that may be on the board. Observe the separation of the network and modem side circuitry. Maintain at least ¼ inch (6mm) separation between the two. Do not run power planes under the network side circuitry and maintain the same spacing for the planes from the network. Use only UL, CSA, or TUV approved components that cross the isolation barrier or for network protection to assure compliant performance for the DAA. The transformer used for coupling will have an influence on the values of the components in the DAA circuitry. The winding resistance, inductances and other characteristics of the transformer affect the values of the impedance matching components. Make sure you have the transformer manufacturer s recommended circuit values when using other transformers. The values can be determined through simulations, but may still require some adjustment to optimize the design. Page 13 of 74

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15 73M2901CE Worldwide Demo Board User s Manual 3 USING THE 73M2901CE WORLDWIDE DEMO BOARD: NEW FEATURES 3.1 INTRODUCTION The 73M2901CE is the newest member of the 2901 family of integrated circuit modems. It includes several new features that make it the right choice for many new designs, and it may be used in existing 2901 designs as well. The 73M2901CE is backward compatible with the 73M2901CL and includes features that allow an existing CL design to be cost-reduced for many applications. New features include: SMS mode and V.23 half duplex (HDX) support Leased line support Energy incoming ring detection Improved Caller ID performance, including compliance with EIA777A New Caller ID TYPE II mode Selectable answer tone detection Various S register features added 3 To take advantage of these new features, the following information is provided. Information on using the special features of the Worldwide Demo Board is also covered. 3.2 SMS AND V.23 HALF DUPLEX SMS (Short messaging Services) is the communications mode used to transmit text messages for cell phones and eventually wire line phones as well (see the separate app note, 73M2901CE SMS and Half Duplex V.23 Operation ). The V.23 half duplex mode has been included with the addition of the B10 command (ATB10). The B10 command allows the used to turn the transmitter on and off using the serial interface RTS signal. In this way the modems can easily communicate in half duplex mode using RTS to enable transmission and CTS to indicate the modem is ready to send data. The V.23 receiver response time has also been improved to allow for fast line turnaround (reversal of the data flow). The pattern generator has also been modified to send the proper alternating pattern used in the SMS handshake. SMS messaging is very similar to the format used for Caller ID, so the 2901CE can also be used to send Caller ID messages to equipment designed to use and display Caller ID information. A typical command line for a dial up connection would be: ATY0B10S73-32C2R2S10=255<CR>. These commands are broken out as follows: Y0 Clear channel mode (1200 bps) B10 V.23 HDX gated by RTS S73-32 No 125mS wait between commands C2 DCD follows the raw received carrier R2 Toggle DTR to hang up S10=255 Disable loss of carrier timeout Note that RTS/CTS flow control cannot be used when using V.23 half duplex since RTS is used to turn the carrier on and off. XON/XOFF flow control should be used instead if flow control is needed. The transmitter RTS to carrier on delay time is 10mS and the off delay is 5mS. 3.3 LEASED LINE MODE One of the drawbacks to the earlier 73M2901 modems is that they are designed primarily for dial-up modem applications. This made it difficult to use them in some non-dial-up designs. The 73M2901CE adds a leased line mode that allows a modem to go into the data mode without having to go through a normal handshake or the need for a connection to another modem. The leased line mode is enabled Page 15 of 74

16 73M2901CE Evaluation Board User s Manual using command in the initialization string. The 73M2901CE leased line mode should not be thought of as limited to only leased line. It is also suited to radio links and any applications where the modem needs to be ready to go when it is first connected. Leased line mode can be used with all modulation modes that are supported by the 73M2901CE. Table 1 shows typical command initialization strings that can be used. V22bis LL V22 LL B212 LL B103 LL B202 RX LL B202 TX LL V23 HDX LL V23 TX1200 LL V23 TX75 LL V21 LL ATFS99=1Y6K3C1R2S30=4S70=12S26+4O2@L1 ATFS99=1Y6K3C1R2S30=8@L1 ATFS99=1Y6K3C1R2S30=16@L1 ATFS99=1Y6K3C1R2S30=32@L1 ATFS99=1Y6K3C1R2B4@L1 ATFS99=1Y6K3C1R2B5@L1 ATFS99=1Y0C2R2B10@L1 ATFS99=1Y6K3C1R2B3@L1 ATFS99=1Y6K3C1R2B2@L1 ATFS99=1Y6K3C1R2S30=64@L1 Table 3-1. Leased Line Initialization commands These commands are broken out as follows: F Set to factor defaults S99=1 Set to U.S configuration (default) Y0 Used clear channel mode (no speed buffering) Y6 Use DTE/DCE speed buffering K3 Use RTS/CTS flow control C1 Use qualified carrier detection C2 Use raw carrier detection R2 Disconnect on DTR toggle S30=n Set S30 to a modulation mode Bn Set to modulation mode O2 Respond to retrain requests S26+4 Enable auto retrain requests S70=12 Lower retrain request threshold to Leased line mode Once the initialization string is given, the modems are started by sending ATD to one modem and ATA to the other. The modems will then begin sending carriers and look for carrier from the other modem. When the modems disconnect using R2 and DTR, an OK result code is sent on RXD. The modem will stop sending carrier at the end of the OK message, the delay time determined by the DTE speed and the time it takes to output the message. It is important to note the auto retrain feature (O2) should be enabled when using V.22bis. V.22bis requires training when it connects and auto retrain is off by default. Make sure S26+4 is also sent so it can also initiate a retrain as well M2901CE ENERGY RING DETECTION The 73M2901CE has a new feature that was added with the intention of lowering the total modem cost by eliminating some of the more expensive external components. The threshold for the ring detector depends on the setting of the S123 register and the components in the Caller ID path, especially the transformer. The number that S123 is set to represents the amplitude threshold of the ring signal (see Table 2). In a conventional ring detect circuit the threshold is set by the hardware, usually the values of the zener diodes in the ring detect circuit. Page: 16 of TERIDIAN Semiconductor Corporation Rev 1.5

17 73M2901CE Worldwide Demo Board User s Manual US Wet Transformer S123 Register Setting w/ freq. Checking Vrms min off to on Vrms min on to off CTR-21 Dry Transformer S123 Register Setting w/ freq. Checking Vrms min off to on Vrms min on to off Figure 3-1 Approximate Thresholds for Energy Ring Detection Having the ability to set the threshold over a wide range through the S123 register eliminates the need to change components to adjust the ring detection sensitivity. Energy ring detection uses the Caller ID path and coupling transformer to path to pass the incoming ring signal to the modem so it can detect the ring signal using the internal DSP. In an average design this can save at least $0.35 in the total parts cost or even more in lower volume products. The 73M2901CE is still compatible with the earlier 2901 products and still supports the opto-coupled ring detection method, although not on this demo board. Wet transformers generally have poorer frequency response in the ring frequency range than dry transformers. This means that the threshold must be sent to a lower number for wet transformers than with some V.90-rated dry transformers. This also means that lower frequency ring signal detection will also require a lower setting. The range of values for S123 can be from 1 to 127 when checking frequency or 129 to 255 when not checking frequency. The practical range is from 3 to 30 when checking frequency, depending on the transformer, Caller ID series resistor, capacitor, and the ring frequency. The other ring parameters such as ring frequency (S17 and S18) and cadence (S51-S58) still need to be programmed when using energy ring detection. The typical initialization string for ring detection and auto answer for the U.S. would be: ATS123=7S0=1<CR><LF> For other countries, the other ring parameters should also be individually programmed, or the S99 register can be used to program all the country parameters. 3.5 CALLER ID MODE CHANGES The Caller ID modes have also had some enhancements. There is now two different types of TYPE II caller ID; normal TYPE II and snoop mode TYPE II. Normal TYPE II Caller ID is on when S110 bit 3 is turned on. The modem must be off hook (in use) for this mode to be active. When the modem detects an alerting tone telling it that a call is waiting and that a Caller ID message is about to be sent. The modem then sends a DTMF digit D to notify the CO that A TYPE II Caller ID device is present. The CO then sends the Caller ID message, and after receiving the message the 73M2901CE will go onhook (hang up). TYPE II snoop mode is enabled when S95=$99 (99 hex). In this mode the modem will report either a TYPE I or TYPE II Caller ID message when the modem is on hook. If another Caller ID device is off hook the modem will detect the Caller ID handshake and output the Caller ID data, but the 73M2901CE will not actively participate otherwise. TYPE II Caller ID performance has been improved and, using proper coupling circuitry to monitor the CID signal, the 73M2901CE can pass all EIA-777A tests. 3.6 SELECTABLE ANSWER TONE FREQUENCY DETECTION It is now possible to select which frequencies will be detected as an answer tone during the handshake. A new S register, S120, has been added for this purpose. This adds some flexibility to the handshake in dial-up applications. The register bit definitions are as follows: Bit Hz V21 Marks (default) Page 17 of 74

18 73M2901CE Evaluation Board User s Manual Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit Hz V23 Marks 2100Hz ITU Answer Tone (default) Reserved 2225Hz Bell Answer Tone (default) 2250Hz S0 (default) Reserved Reserved 3.7 OTHER S REGISTER ADDITIONS AND CHANGES S118 - CALLER ID RING INTERRUPT DELAY (Default = 20) Disables ring interrupt detection for the specified period during CID enable/disable transitions, measured in ms. This can be used with the Clare optical DAA to delay ring detection when the Caller ID path is switched. Noise generated from switching can falsely trigger ring detection in some cases S119 - WAIT BEFORE CONNECT (Default = FFh) Normally the TX and RX data paths are enabled at the same time. This register allows programmable delay between completion of handshake and CONNET (ready to receive data). This changes only the timing of when data can be received. The transmit data path will not be enabled until the end of the normal timeout. Setting the value at this register will affect timing for all modes. Resolution is in 10 ms increments. The normal TX/RX delay times are as follows: QAM Answer Mode = 200 ms PSK Answer Mode = 770 ms PSK Originate Mode = 770 ms FSK Originate Mode = 300 ms When S119 = $FF (Default), the 73M2901CE uses same value of wait as in the past S121 - ANSWER TONE QUALIFY TIME The value of this register extends the answer tone qualification time beyond the 155ms minimum in 10ms units. For example a value of 10 would yield a total answer tone qualification time of 255 ms ( 100ms + 155ms ) S122 - PARALLEL PICK UP DEBOUNCE TIMER Register S122 sets the duration of the parallel pick debounce timer in 10ms increments. This can be used to improve the noise immunity of the parallel pick-up detection with some DAA architectures and hardware. Page: 18 of TERIDIAN Semiconductor Corporation Rev 1.5

19 73M2901CE Worldwide Demo Board User s Manual 4 4 USING THE 73M2901CE WORLDWIDE DEMO BOARD: AT COMMAND SET 4.1 THE AT COMMAND SET AT COMMANDS OVERVIEW The 2901 supports an optimized version of the industry standard Hayes At Command Set. The main distinction between the Hayes AT Command Set and the 2901 AT Command Set is the use of the & (ampersand) command. The 2901 does not use the & command. Although many 2901 commands relate directly to the Hayes & commands, this is not always the case. For instance the 2901 ATC[n] command is similar to the Hayes AT&C[n] command but not identical, so do not make the assumption that they are the same in all cases just because they are the same in some cases. AT commands are issued using the following convention: AT<command string><enter> AT commands must be preceded by the characters AT. The modem uses this sequence of ASCII characters to determine the speed and parity of the DTE. The modem expects a command or string of commands to follow. Command String Conventions The command string may consist of a letter, for example F The command string may consist of a letter followed by a number, for example N2 The command string may consist of a S register set equal to a value, for example S30=4 The command string may consist of a string of all of the above, for example FS99=1B2C1X4S30=4 *Generally the order of the commands is not significant unless S registers are set. Refer to Section S Registers. Enter AT Commands must be followed by an <Enter> EXAMPLES: ATFS99=1Y6K3C1R2S30=4 V.22bis using flow control (U.S.) ATDT2 Go off hook and dial the number 2 ATS95+$10 Set the Caller ID enable pin *There are two exceptions to this convention, the commands A/ (repeats last instruction issued) and +++ (enter online command mode) are neither preceded by an AT nor followed by a CR, nor do they take any arguments. They are each described under the AT Commands heading in this section. Online Command Mode Online command mode allows the user to issue AT commands, including setting and reading some S Registers, while connected. After a connection has been established, and in the absence of streaming data, one can enter online command mode and send instructions to the modem. Not all commands issued while in online command mode will take effect immediately. Some AT commands, including S Register settings, will not take effect until after the connection has been broken. For instance you would not be able to change modulation standards or from synchronous to asynchronous data while connected. In addition values read from some S Registers while in online command mode may not accurately reflect certain states. Entering online command mode: Issue this command to the modem (neither preceded by AT nor followed by <ENTER>): +++ Timing is critical when entering this command, enter each + character one after another at a steady rate. If the modem does not respond, repeat the command adjusting the speed of the key presses. The modem should respond with: OK The modem is now ready to accept AT Commands just as if it were in idle mode. Return to data mode: Issue the following command: The modem should respond with: ATO CONNECT [DTE SPEED] Page 19 of 74

20 73M2901CE Evaluation Board User s Manual The modem is now back in data mode and ready to send and receive data. 4.2 AT COMMANDS A - ANSWER The A command causes the modem to immediately go on-line (off-hook) in the Answer mode and attempt to handshake regardless of the value of register S0, discussed later. This command gives you a method of manually answering an incoming phone call. For restrictions, see also the R command A/ - REPEAT LAST COMMAND The A/ command causes the modem to re-execute the last command that was issued. For example, this command can be used to redial a number if the previous command was a dial command. NOTE: A/ and +++ are the only commands that are neither preceded by AT nor followed by <Enter> B - BELL, ITU, V.23, or BELL202 OPERATION The B[n] command is used to select between modes of operation. B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 Selects ITU V.22Bis, V.22 or V.21 operation (default). Selects Bell212A or Bell103 operation. Selects 1200 bps. receive and 75 bps. transmit for V.23 operation. Selects 75 bps. receive and 1200 bps. transmit for V.23 operation. Selects 1200 bps. receive for Bell202 operation. Selects 1200 bps. transmit for Bell202 operation. Selects 1200 bps. receive and transmit for 4-Wire V.23 operation. (V23T) Selects 1200 bps. receive and transmit for 4-Wire V.23 operation. (V23T) Selects 1200 bps. receive and transmit for 4-Wire Bell202 operation. (B202T) Selects 1200 bps. receive and transmit for 4-Wire Bell202 operation. (B202T) Selects 1200 bps V.23 Half duplex mode ( V23H). B10 and B11 are the same. Selects 1200 bps V.23 Half duplex mode ( V23H). B10 and B11 are the same C[n] - SELECT CARRIER DETECT OPTION The C[n] command selects how the Carrier Detect (CD) signal is controlled. C0 C1 C2 CD forced ON. (Default) CD ON in presence of valid debounced carrier signal. CD ON in presence of raw carrier signal. Receive data independent of valid carrier signal. (May be reserved) Operation of DCD: Normal modes: C0 ON at all times Page: 20 of TERIDIAN Semiconductor Corporation Rev 1.5

21 73M2901CE Worldwide Demo Board User s Manual DCD OFF ON C1 ON while connected DCD Not connected Connected Not Connected V.23 turnaround DCD V.23 turn around D[n...n] - DIALING STRING This command puts the modem into originate mode and instructs the modem to dial the phone number expressed by the string argument n...n. The number will be dialed with either tones or pulses depending on how the last number was dialed. On power up, this command will default to pulse dialing. (See the note in DT[n...n] command.) The allowable arguments for n...n differ for pulse and tone dialing; see the descriptions under DT[n...n] and DP[n...n]. DP[n...n] n = 0-9, P T R W S[r]=[n]J5.[n] This command instructs the modem to dial the phone number expressed by the argument n...n using pulse dialing. (See the detailed description of the arguments under DT[n...n] below.) DT[n...n] n = 0-9 A B C D * #, P T R W S[r]=[n]J5.[n] This command instructs the modem to dial the phone number expressed by the argument n...n using tone dialing. In addition to 0-9 A B C D * #, which are the same as the keys on your phone, there are some special characters that can be included in a dialing string. They are called Dial String Modifiers, and they define how the phone number is to be dialed. These characters are P R T W. A-D*# The characters A B C D, and the symbols * and #, can be used only during tone dialing. They are used to access newer features of modern telephone systems. typically P R T The modem pulse dials the digits that follow. The modem uses answer mode frequencies after dialing the number. This allows you to dial up an originate only modem. Busy detect is disabled during Reverse Dial. The modem tone dials the digits, characters, and symbols that follow. ; A ; (semicolon) causes the modem to go back into the Command State, allowing you to enter other commands while on-line. To do this, the ; must be the last character in the command line., When inserted in a dialing string, a, (comma) causes the modem to pause. The default time for the pause is two seconds, and can be changed by modifying register (commercial "at") causes the modem to wait up to 30 seconds for a 5 second period of quiet before proceeding. This is often used to detect the end of a prerecorded message. The default wait time is 30 seconds, and can be changed by modifying register S7. Result Codes 7 and 8 will be reported regardless of which Result Code Set is selected. Page 21 of 74

22 73M2901CE Evaluation Board User s Manual! An! (exclamation mark) causes a "hook flash." This simulates hanging up for 1/2 second and then reconnecting. It is typically used for transferring calls. W Causes the modem to wait for a dial tone for a specified length of time before proceeding. The default is 8 seconds, and can be changed by modifying register S66. Result Code 6 will always be included regardless of which Result Code Set is selected. J PTT Test. See J[n] command E[n] - ECHO COMMANDS ON/OFF n = 0 or 1 (factory default = 1) Causes the modem to either echo characters or not to echo characters while in the Command State. E0 E1 Command State Echo mode is OFF. Command State Echo mode is ON F- LOAD FACTORY DEFAULTS The F command replaces the current active configuration profile with the factory standard configuration profile stored in permanent memory. Returns ERROR result code, if modem is off-hook G - GUARD TONE SELECT This command selects the guard tone. G0 Guard tones disabled (default) G1 G2 550Hz guard tone enabled 1800Hz guard tone enabled H[n] - ON-HOOK/OFF-HOOK CONTROL n = 0 or 1 (factory default = 0) The H[n] command causes the modem to go off-hook or on-hook. (Going off-hook means that the modem "picks up" the telephone; going on-hook means that the modem "hangs up" the telephone.) The H[n] command applies only to asynchronous operation. H0 H1 Go On-hook (hang up) or terminate PTT test. Go Off-hook (pick up the phone). Note: ON HOOK: Commands Z, H0, F, J0, at the beginning of hook flash, at a pulse break and at disconnect and reset. OFF HOOK: Commands used: H1, D, J1, J2, J3, J4, A and auto answer Page: 22 of TERIDIAN Semiconductor Corporation Rev 1.5

23 73M2901CE Worldwide Demo Board User s Manual I[N] - IDENTIFICATION AND ROM TESTS n = 0 to 11. Default is no test in progress. The I[n] command requests that the modem respond with certain product information. I0 I1 I2 I3 I4 I5 I6 I7 I8 I9 I10 I11 Returns product identification code. Returns the firmware ROM checksum number. Computes the firmware ROM checksum and returns with either an OK or ERROR result code message Returns firmware revision number. Returns copyright notice. RAM test. MAC RAM test. MAC ROM test. RAM address decode test. MAC address decode test. Return ROM CRC. Check ROM CRC J[n] - PTT TEST Default is take no action (not in test mode). J0 Stop J test in progress. J1 Transmit DTMF tones specified by S12, S13, and S85. J2 Transmit Answer tone or Calling tone specified by S27, S13 and S91. J3 J4 Transmit Modulation specified by S14, S30, S60 and the B command. Transmit Silence. J5 Delay (To set up the delay use J5.[n]. [n] is in 10 ms. Range is 1 to 211) J6 J7 J8 Allow detection of CAS and DTMF tones Analog interface test mode. (S113 is used as the minimum carrier detect threshold) Type 2 CID test mode for use with the Advent system K[n] - FLOW CONTROL The K[n] command selects which flow control options are available when rate buffering. K0 K3 Flow Control Disabled (Default) RTS/CTS CTS When 15 or more bytes are in the TX buffer When 4 or less bytes are in the TX buffer K4 XON/XOFF Page 23 of 74

24 73M2901CE Evaluation Board User s Manual L[n] FAST CONNECT RTS/CTS flow control The L[n] command enables the modem to perform 1200 Fast Connects. L0 L1 L2 L3 Disable Fast Connect (default). Disable 2100 Hz answer tone and billing delay. 2 second billing delay enabled with no 2100 Hz answer tone. 400 ms answer tone and billing delay enabled N[n] - DATA SET READY SIGNAL CONTROL The function of the DSR line is determined by the N[n] command. n = 0 to 2. N0 N1 N2 DSR is always ON (low). DSR off (high) in the idle state and when in a test mode. DSR circuit is turned on at start of the handshaking process. DSR is turned off when hang-up process is started. DSR off in the idle state and when in a test mode. DSR circuit is turned on at the end of handshake after issuing the CONNECT result code. DSR is turned off when hang-up process is started. 1) Mode V22bis, Protocol enabled (through S25), Extended result codes. V.22bis Connection Carrier Result V.42 Detection Protocol/Connect Result Data Mode DCD DSR 2) Mode V22bis, Protocol enabled (through S25), Normal result codes. V.22bis Connection V.42 Detection Connect Result Data Mode DCD DSR 3) Mode V22bis, Protocol enabled (through S25), No result codes. V.22bis Connection V.42 Detection Data Mode DCD DSR Page: 24 of TERIDIAN Semiconductor Corporation Rev 1.5

25 73M2901CE Worldwide Demo Board User s Manual 4) Mode V22bis, No Protocol, Extended result codes V.22bis Connection Carrier Result Protocol/Connect Result Data Mode DCD DSR 5) Mode V22bis, No Protocol, No result codes. V.22bis Connection Data Mode DCD DSR O[n] - RETURN TO ON-LINE The O[n] command is used to go back on-line when the command state was entered by issuing the +++AT escape sequence or turning DTR from ON to OFF with the appropriated S-Register setting in effect. The O[n] command applies only to asynchronous operation. O0 If you have returned to Command state from Data state without breaking a connection, the O0 command will return you on-line (Data state). O[1-7] Retrain O1 Similar to O0, but also causes the modem to initiate an equalizer retrain sequence. O2 O3 O4 O5 O6 O7 Enables the modem to respond to a remote request for retrain. Disables the modem to respond to a remote request for retrain (default). Enables speed negotiation. Disables speed negotiation (default). Enables rate change to 1200 bps. Enables rate change to 2400 bps (default). Note: If commands O0 or O1 are given to the modem while not connected, it will respond with ERROR P - PULSE DIAL Causes the modem to pulse dial until tone dialing is selected or the modem is reset Q[n] - RESULT CODES ON/OFF The Q[n] command tells the modem to either report result codes or to remain quiet. Result codes acknowledge AT commands and call status events. Also refer to the V[n] and X[n] commands. Q0 Q1 Report Result Codes (default). Stay quiet. Page 25 of 74

26 73M2901CE Evaluation Board User s Manual R[n] - SELECT DATA TERMINAL READY OPTION The R[n] command selects how the Data Terminal Ready (DTR) signal is used by the modem. R0 In Asynchronous mode, the modem ignores DTR. (Default) R1 - Modem assumes the Command State when DTR transitions from ON to OFF. R2 - Modem goes on-hook (hangs up), disables the Auto Answer mode, and assumes the Command State when DTR transitions from ON to OFF. Turning DTR back ON will enable auto-answer mode. R3 - Modem is reset when DTR transitions from ON to OFF. R4 - Enable V.23 Turnaround via DTR (On to Off edge triggered) in Master mode. Turn around is done via RTS in all other R command settings. R5 Power Down with setting DTR high (requires hard reset to resume normal operation) S[r] - MODIFY/READ S REGISTERS S[r]? Show S-Register Value The S[r]? command requests the modem to report the current value of register [r]. These registers are used to set up various operating parameters of the modem as explained in Chapter 5. The value reported is in decimal notation. S[r]$ Show S-Register Value in Hexadecimal The S[r]$ command requests the modem to report the current value of register [r]. The value reported is in hexadecimal notation. S[r]??? Show Successive S-Register Values The S[r]??? command requests the modem to report the current value of [r] and successive registers. The values are reported in decimal notation. The number of registers reported corresponds to the number of? (question marks) given to the modem. For an example: S10??? will report the values stored in the registers S10, S11, S12. S[r]$$$ Show Successive S-Register Values in Hexadecimal The S[r]$$$ command requests the modem to report the current value of [r] and successive registers. The values are reported in hexadecimal notation. The number of registers reported corresponds to the number of $ (dollar signs) given to the modem. For an example: S10$$$ will report the values stored in the registers S10, S11, S12. S[r]=[n] Set S-Register Value S[r]=[n] Set S-Register Value r = 0 to 104 n = 0 to 255 The S[r]=[n] command allows you to set (modify) the value of any of register [r] to new value [n]. The value [n] is entered in decimal notation. S[r]=n.$n.n.$n Set S-Register Values The S[r]=n.$nn.n.$nn command allows you to set (modify) the value of any of [r] and successive registers to the new values n (decimal notation) or $n (hexadecimal notation). For an example: S10=$F0.128.$EC.25 will set register S10=F0 (hexadecimal), S11=128 (decimal), S12=EC (hexadecimal), and S13=15 (decimal). All hexadecimal values must be entered in as a two digit hex value. For example enter $0A instead of $A. S[r]+[n] Set Bits in S Registers The S[r]+[n] command sets bits in [r] S register by ORing the [n] value and the value currently in the S Register. S[r]-[n] Clear Bits in S Registers Page: 26 of TERIDIAN Semiconductor Corporation Rev 1.5

27 73M2901CE Worldwide Demo Board User s Manual The S[r]-[n] command clears bits in [r] S register by ANDing the [not n] value and the value currently in the S Register T - TONE DIALING Causes the modem to tone-dial until pulse dialing is selected V[n] - SELECT RESULT CODES NUMBERS/WORDS n = 0, 1, 2 (factory default = 1) The V[n] command instructs the modem to report either verbal (whole words) or numerical result codes. Also refer to the Q[n] and X[n] commands. V0 V1 V2 Result codes reported as digits (numerals). Result codes reported as whole words. Result codes reported as digits (numerals) preceded and followed by <CR><LF> W[n] - SELECT EXTENDED RESULT CODE n = 0, 1, 2 (factory default = 0) The W[n] command determines which result codes will be used to describe the type of connection that was negotiated by the handshake. W0 W1 W2 Do not return extended result codes (40-80). The message CONNECTS followed by the data rate between the DTE and the modem will be sent to the DTE. The CONNECT message will report the DTE speed then enable the carrier and extended result codes. The CONNECT message will report the DCE speed. All extended result codes are disabled. Extended Result Codes: Result Code 40 = CARRIER 300 Result Code 41 = CARRIER 600 Result Code 46 = CARRIER 1200 Result Code 47 = CARRIER 2400 Result Code 44 = CARRIER 1200/75 Result Code 45 = CARRIER 75/1200 Result Code 70 = PROTOCOL: NONE Result Code 77 = PROTOCOL: LAP-M Result Code 80 = PROTOCOL: ALT Pre Dial Post Dial W0 W1 W2 W0 W1 W2 X0 0, 2 4, 0, 2 4, 14 0, 2 4, , 3 4, , 3 4, , 3 4, X1 0, 2 4, 0, 2 4, 14 plus 0, 2 4, , 3 5, 9 0 1, 3 5, 9 14, 22, 23 plus 0 1, 3 5, 14 extended result 14, 22, 23 extended result codes 9-14, 22, codes 23 X2 0, 2, 4, 0, 2, 4, 6, 14 plus 0, 2, 4, 6, , 3 5, 9-0 1, 3 5, 9 14, 22, 23 plus 0 1, 3 5, 6, 14 extended result 14, 22, 23 extended result codes 9-14, 22, codes 23 X3 0, 2 4, 0, 2 4, 14 plus 0, 2 4, , 3 5, 7, 9-0 1, 3 5, 7, 9 14, 22, , 3 5, 14 extended result 14, 22, 23 plus extended result codes 7, 9-4, 22, codes 23 Page 27 of 74

28 73M2901CE Evaluation Board User s Manual X4 0, 2, 4, 6, 14 Pre Dial X5 0, 2 4, 7, 14 X6 0, 2, 4, 6-7, 14 X7 0, 2 4, 7, 14 X8 0, 2, 4, 6-7, 14 0, 2, 4, 6, 14 plus extended result codes 0, 2 4, 7, 14 plus extended result codes 0, 2, 4, 6-7, 14 plus extended result codes 0, 2 4, 7, 14 plus extended result codes 0, 2, 4, 6-7, 14 plus extended result codes 0, 2, 4, 6, , 3 5, 7, 9-14, 22, 23 Post Dial 0, 2 4, 7, , 3 5, 9-14, 22, 23 0, 2, 4, 6-7, , 3 5, 9-14, 22, 23 0, 2 4, 7, , 3 5, 7, 9-14, 22, 23 0, 2, 4, 6-7, , 3 5, 7, 9-14, 22, , 3 5, 7, 9 14, 22, 23 plus extended result codes 0 1, 3 5, 9 14, 22, 23 plus extended result codes 0 1, 3 5, 9 14, 22, 23 plus extended result codes 0 1, 3 5, 7, 9 14, 22, 23 plus extended result codes 0 1, 3 5, 7, 9 14, 22, 23 plus extended result codes 0 1, 3 5, 7, 9 14, 22, , 3 5, 9-14, 22, , 3 5, 9-14, 22, , 3 5, 7, 9-14, 22, , 3 5, 7, 9-14, 22, X[n] - SELECT RESULT CODE SET n = 0 to 8 (factory default = 4) The X[n] command selects normal or extended result code reporting and enables or disables advanced functions. X0 Enable Result Codes 0-4, 14. X1 Enable Result Codes 0-5, X2 Enable Result Codes 0-6, X3 Enable Result Codes 0-5, 7, X4 X5 X6 X7 X8 Enable Result Codes 0-7, (default). Enable Result Codes 0-5, and detect BUSY at OFF HOOK. Enable Result Codes 0-6, and detect BUSY at OFF HOOK. Enable Result Codes 0-5, 7, and detect BUSY at OFF HOOK. Enable Result Codes 0-7, and detect BUSY at OFF HOOK. Result Code 0 = OK Result Code 1 = CONNECT Result Code 2 = RING Result Code 3 = NO CARRIER Result Code 4 = ERROR Result Code 5 = CONNECT 1200 Result Code 6 = NO DIALTONE Result Code 7 = BUSY Result Code 8 = NO ANSWER dial modifier is used and quiet answer is not detected within S7) Result Code 9 = CONNECT 0600 Result Code 10 = CONNECT 2400 Result Code 11 = CONNECT 4800 Result Code 12 = CONNECT 9600 Result Code 13 = CONNECT 7200 Result Code 14 = LINE-IN-USE Result Code 22 = CONNECT 75/1200 Result Code 23 = CONNECT 1200/75 If X0, X1, X3, X5 or X7 modes are enabled, the modem will delay a number of seconds (determined by the value of register S6), not check for a dial tone, and then dial. Page: 28 of TERIDIAN Semiconductor Corporation Rev 1.5

29 73M2901CE Worldwide Demo Board User s Manual and W dial modifier result codes are not affected by the Xn command in effect. dial modifier enables result codes 8 (NO ANSWER) and 7 (BUSY) each time it occurs in the dial string. The W dial modifier enables result codes 6 (NO DIALTONE) and 7 (BUSY) each time it occurs in the dial string Y[n] - SELECTS ASYNCHRONOUS OR SYNCHRONOUS MODES n = 0 to 6 (default = 6) Y0 Y1 Asynchronous mode. No speed buffering, no protocol. Synchronous mode. No speed buffering, no protocol. Y4 Quasi-Synchronous mode. Allows the transmission and reception of sync data through an asynchronous DTE by stripping off start and stop bits on transmission and adding them on reception. Y6 Asynchronous with speed buffering. Allows fixed DTE-DCE speed so applications do not need to change the communications rate based on connection results. (Default) Must be used with flow control (K3 or K4), which is not ON by default Z - RESET MODEM The Z command resets the modem. The Z command is equivalent to a power cycle During a data connection, the escape command (+++) returns you to TIES Command State without terminating the data connection so you can enter AT commands. When in TIES Command State, all the AT commands given to the modem will be seen by the remote modem as data. If a valid AT command is not sent or if data is sent to the modem instead of AT commands while in this mode, the modem will return to data mode AT During a data connection, the escape command (+++AT <ENTER>) returns you to Command State without terminating the data connection so you can enter AT commands. 4.3 EXTENDED AT COMMANDS - MODIFY/READ MAC RAM MEMORY Inquire MAC RAM Memory Value command requests the modem to report the current value of a specified location of MAC RAM. The value reported is in decimal Inquire MAC RAM Memory Value command requests the modem to report the current value of a specified location of MAC RAM. The value reported is in hexadecimal [n] Set MAC RAM Set MAC RAM, n = 0 to 255 (decimal) or $n = 00 to FF (hexadecimal) command allows you to set (modify) the value of a specified location of MAC RAM. The value [n] can be entered in multiple instances separated by a dot in either decimal or hexadecimal (preceded by $) notation. Page 29 of 74

30 73M2901CE Evaluation Board User s Manual - MODIFY/READ IRAM MEMORY Inquire IRAM Memory Value command requests the modem to report the current value of a specified location of IRAM. The value reported is in decimal Inquire IRAM Memory Value command requests the modem to report the current value of a specified location of IRAM. The value reported is in hexadecimal [n] Set IRAM Set MAC RAM, n = 0 to 255 (decimal) or $n = 00 to FF (hexadecimal) command allows you to set (modify) the value of a specified location of IRAM. The value [n] value [n] can be entered in multiple instances in decimal or hexadecimal (preceded by $) notation. - SET LEASE LINE OPERATION Lease line operation is designated by S89 bit 2 n = 1 sets lease line bit n = 0 clears lease line bit - ALTERNATE PULSE DIAL MAKE/BREAK RATIO command, where n = 0 or 1 sets S22 bit 7 to new value n. The effect of this is to toggle between two pulse dial make break ratios. n = 0 selects U.S. (39/61). n = 1 selects U.K/Hong Kong (33/67). This command works only when S32 and S33 are each set to 0. - SELECT TEST MODE n = 0, 1, 3 to Terminate any test in progress. command must be the last in the command Initiate a Local Analog Loopback Test (ITU V.54 @T5 Initiate a Local Digital Loopback test. Instructs the modem to grant a request from the remote modem for a Remote Digital Loopback test. Instructs the modem to deny a request from the remote modem for a Remote Digital Loopback Initiate a Remote Digital Loopback test (ITU V.54 Loop Initiate a Remote Digital Loopback self-test (ITU V.54 Loop Initiate a Local Analog Loopback self-test (ITU V.54 Loop 3). POWER DOWN Page: 30 of TERIDIAN Semiconductor Corporation Rev 1.5

31 73M2901CE Worldwide Demo Board User s Manual Allows the part to go into deep power down mode. All commands following command are ignored, therefore it is advisable that command be at the end of a command line. 4.4 S-REGISTER OVERVIEW The 73M2901CE allows the user to directly access the S-Registers through the AT Command Set. This feature enables an added level of control over the modem's operation. Setting S Registers directly involves some amount of risk, and requires understanding of the internal function of the modem. The order in which S Registers are set in the command string may be significant, for instance when setting S99 it is necessary that it be the first command in the command string because it affects many other S Registers. The F command, which the restores factory defaults, voids any commands preceding it including S Register settings. AT commands themselves set S Registers so the user must be aware of each operation remembering that each command in a command string is executed one at a time in the order they are presented in the command string. The AT Command interpreter can set and reverse the commands, giving a result far from what was intended; the modem assumes that the user knows what he or she is doing SETTING S REGISTERS The mechanism for directly setting an S Register is the ATS[n] = [value] command. Where [n] is equal to the particular S Register, and [value] is equal to the value that is to be written to the register. The [value] may be in either decimal or hex. Hexadecimal values must be preceded with a $ and must be two digits, for example ATS14 = $A is not valid, but ATS14 = $0A is READING S REGISTERS The mechanism for reading an S Register is the ATS? or the ATS$ command. ATS? with result in a decimal value reported to the DTE and ATS$ will result in a hexadecimal value being reported to the DTE. The user should be aware that many registers have bits that are used internally and are constantly changing in the idle state SETTING/READING S REGISTERS WHILE IN ONLINE COMMAND MODE While connected, it is possible to enter online command mode and Set or Read some S Registers. This may not always produce the desired effect. Some S Register settings will not take effect until after the connection has been broken. For example you would not be able to change modulation standards or go from synchronous to asynchronous mode while connected. In addition values read from some S Registers while in online command mode may not accurately reflect certain states. 4.5 S REGISTERS S0 - AUTOANSWER This register specifies the ring on which the modem will answer. A value of 1 to 255 will place the modem in autoanswer mode and cause it to answer on the ring set by S0. A value of zero will disable auto-answer. RI will toggle after each ring cycle is qualified, the timing determined by the setting of the S53 minimum ring off time register and the DTE data rate. The RI signal duration will be 60 ms plus the time to output the RING result code. RI RING "ON" TIME RING RING "OFF" TIME S0 is cleared on Reset S1 - RING COUNT Page 31 of 74

32 73M2901CE Evaluation Board User s Manual When the modem is set for Auto-Answer, register S1 keeps track of the number of times the phone rings. After the end of ring-on time, the S1 register is reset to 0 after the maximum of S54 or S58 seconds, which ever is less. Range is rings S2 - ESCAPE CODE CHARACTER (Default = 43) The S2 register contains the ASCII value of the Escape Command character. The default is 43, which is the ASCII +. If you select a value greater than 127, the Escape feature is disabled and you cannot switch from the Data State to Command State while maintaining your data connection. Range is (ASCII). Default is 43 (+) S3 - CARRIAGE RETURN CHARACTER (Default = 0Dh) The S3 register contains the ASCII value of the carriage return character. This character terminates both the command line and the result codes. Range is (ASCII). Default is 13 (carriage return) S4 - LINE FEED CHARACTER (Default = 0Ah) The S4 register contains the ASCII value of the line feed character. It is used only when verbose result codes (V1) are selected. If you do not want a line feed to be automatically sent after the return following a verbal result code set this value to 0. Range is (ASCII). Default is 10 (line feed) S5 - BACKSPACE CHARACTER (Default = 08h) The S5 register contains the ASCII value of the backspace character. Do not set S5 to ASCII 33 to 126 (ASCII printable characters) or to greater than ASCII 127. Range is 0 32 and 127 (ASCII). Default is 8 (backspace) S6 - WAIT TO BLIND DIAL (Default = 2) The S6 register sets the number of seconds the modem waits before blind dialing. Range is 1-25 (seconds). Resolution is 100 ms S7 - WAIT FOR CARRIER AFTER DIALING (Default = 50) The S7 register performs two functions. It sets the maximum time between dialing and responding to an incoming carrier signal. It also sets the duration of the pause generated by the W dial string modifier. Range is (seconds) S8 - PAUSE TIME FOR COMMA (Default = 2) The S8 register sets the number of seconds the modem will pause during a pause created by a "," (comma) in the dialing sequence. Range is (seconds). Page: 32 of TERIDIAN Semiconductor Corporation Rev 1.5

33 73M2901CE Worldwide Demo Board User s Manual S9 - CARRIER DETECT RESPONSE TIME (Default = 6) The S9 register sets (in 10ths of a second) how long a carrier signal must exist before the modem issues a carrier detect response. Range is (1/10 seconds). Note: Carrier detection while the modem is in the on-line state is governed by the times specified by S9 and S10. The CD light is the carrier detect indicator. If the carrier signal goes off, CD goes off within 20 ms. If the carrier returns, CD turns on within 20 ms after the carrier has been on continuously for the time specified by S9. If CD is off for the time specified by S10, then carrier is lost and the modem hangs up. If S10 is set to 255, the time is considered to be infinite, meaning that the modem will not hang up S10 - LOST CARRIER TO HANG UP DELAY (Default = 14) The S10 register sets (in 10ths of a second) the delay time between loss of carrier and the modem hanging up. After the S10 delay time, the modem hangs up and returns to Command State. Then you will see the NO CARRIER response. If the register is set with a value of 255, the modem will ignore carrier detect status and operate as if the carrier signal were present. If the value of S10 is less than the value of S9 a momentary loss of carrier will cause the modem to hang-up. Range is (1/10 seconds). See note on S S11 - DTMF DIALING SPEED (Default = 70) The S11 register sets the duration and spacing of touch-tones for tone dialing. (Setting this value lower than 50 may produce inaccurate dialing.) This register does not affect pulse dialing. Range is (milliseconds) S12 - DTMF / TWIST DIAL REGISTER (Default = 20h) Register S12 reflects the status of the DTMF options. Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Reserved TWIST2 TWIST1 TWIST0 DTMF3 DTMF2 DTMF1 DTMF0 DTMF3 DTMF2 DTMF1 DTMF0 Digit Low Tone High tone D * # A B C TWIST2 TWIST1 TWIST0 Relative Level db nominal db low frequency below the high frequency tone db low frequency below the high frequency tone (default). Page 33 of 74

34 73M2901CE Evaluation Board User s Manual db low frequency below the high frequency tone db low frequency below the high frequency tone db low frequency below the high frequency tone db low frequency below the high frequency tone db low frequency below the high frequency tone. Note: For normal operation, only the twist needs to be set. The digit is filled in automatically when dialing S13 - DTMF TRANSMIT ATTENUATION (Default = 10h) Gain/Attenuation level can go from +4.0 db to 10.0 or 11.0 db from nominal. DTMF CP / Data D7 D6 D5 D4 D3 D2 D1 D0 DTMF bit3 DTMF bit2 DTMF bit1 DTMF bit0 X CP/D bit2 CP/D bit1 CP/D bit0 Note: DTMF gain increments have to be a minimum of 1dB, while for CP/Data the minimum is 2dB gain increments. Bit 3 Bit 2 Bit 1 Bit 0 DTMF Gain CP/Data Gain db +4.0 db db +4.0 db db +2.0 db db +2.0 db db 0.0 db db 0.0 db db -2.0 db db -2.0 db db -4.0 db db -4.0 db db -6.0 db db -6.0 db db -8.0 db db -8.0 db db db db db S14 - BIT MAPPED REGISTER (default=aah) Register S14 reflects the status of certain options. Register S14 is a bit mapped register whose bits are defined as follows: Bit 0 In Data Mode: 0 = Clear Channel for receiver. 1 = Receive Channel speed buffered. In Call Progress Mode: 0 = Single cadence detection. 1 = Dual Cadence Detection. Bit 1 Bit 2 0 = No echo. 1 = Echo (see the E[n] command) (Default) 0 = Result codes enabled (see Q[n] command) (Default). Page: 34 of TERIDIAN Semiconductor Corporation Rev 1.5

35 73M2901CE Worldwide Demo Board User s Manual 1 = Result codes disabled. Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 0 = Numeric result codes. 1 = Verbal result codes (see the V[n] command) (Default). 0 = No Match. 1 = First Cadence of Dual Cadence Matched. 0 = Touch tone dialing (see T or P command). 1 = Pulse dialing (Default). General Handshake Complete Bit: 0 = Not Connected. 1 = Connected. 0 = Answer. 1 = Originate (Default) S15 - CALLING TONE OFF TIME (Default = 17) The value of this register sets the duration of the calling tone off time in units of 100 ms S16 - CALLING TONE ON TIME (Default = 60) The value of this register sets the duration of the calling tone on time in units of 10 ms S17 - MINIMUM RING FREQUENCY REGISTER (Default = 10) The minimum ring frequency to be acceptable in Hz. Range is from 0 to 253. Note: The values need to be doubled if a full wave detector is used S18 - MAXIMUM RING FREQUENCY REGISTER (Default = 75) The maximum ring frequency to be acceptable in Hz. Range is from 1 to 254. Note: The values need to be doubled if a full wave detector is used S19 - DIAL TONE & BUSY PRECISE TONES BIT MASK (Default = C3h) Defines which precise tones constitute a dial tone and which constitute a busy tone. High nibble defines dial tone and low nibble defines busy. bit 0 S63 bit 0 is selected tone of precise dial tone (Default). bit 1 bit 2 S63 bit 1 is selected tone of precise dial tone (Default). S63 bit 2 is selected tone of precise dial tone. bit 3 S63 bit 3 is selected tone of precise dial tone. bit 4 bit 5 S63 bit 0 is selected tone of precise busy. S63 bit 1 is selected tone of precise busy (Default). Page 35 of 74

36 73M2901CE Evaluation Board User s Manual bit 6 S63 bit 2 is selected tone of precise busy. bit 7 S63 bit 3 is selected tone of precise busy (Default). Note: See calling code table on use S20 - CALL PROGRESS TONES DETECT TYPE (Default = 11h) Busy Dialtone Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bits 3/7 Bits 2/6 Bits 1/5 Bits 0/4 Function Detect Imprecise tones ONLY (default) Detect All Precise tones ONLY Detect Any of the Precise tones S21 - BIT MAPPED REGISTER (Default = 01h) Bit 0 Bit 1 Bit 2 0 = Keypress abort disable. 1 = Keypress abort enable (Default). 0 = Use debounce carrier detect (Default). 1 = Use raw carrier detect (set by C2 command). 0 = Disable V.23 turnaround via DTR toggle (Default). 1 = Enable V.23 turnaround via DTR toggle (set by R4 command). Bit 4 Bit 3 Function: DTR Control 0 0 Modem ignores DTR (Default) (R0) Modem assumes the Command State when DTR transitions from ON to OFF (R1). Modem goes on hook, disables Auto Answer and assumes the Command State when DTR transitions from ON to OFF (Auto Answer can be enabled by transitioning DTR from OFF to ON) (R2). 1 1 Modem is reset when DTR transitions from ON to OFF (R3). Bit 5 Bit 6 Bit 7 0 = CD always ON (equivalent to C0 command) (Default). 1 = CD ON indicates the presence of CD (equivalent to C1 command). 0 = No RTS / CTS DTE flow control (equivalent to K3) (Default). 1 = RTS / CTS DTE flow control. 0 = No XON / XOFF DTE flow control (equivalent to K4)(Default). 1 = XON / XOFF DTE flow control. Page: 36 of TERIDIAN Semiconductor Corporation Rev 1.5

37 73M2901CE Worldwide Demo Board User s Manual S22 - BIT MAPPED REGISTER (Default = 36h) Register S22 reflects the status of certain options. Register S22 is a bit mapped register whose bits are defined as follows: Bit 2 Bit 1 Bit 0 Function: Synchronous/Asynchronous Control Y0 Asynchronous mode Y1 Synchronous mode Y4 Quasi-Synchronous Mode Y6 Asynchronous with speed buffering (Default) Bit 6 Bit 5 Bit 4 Bit 3 Function: Select Result Code Set X0 Enable Result Codes X1 Enable Result Codes 0-5, X2 Enable Result Codes 0-6, X3 Enable Result Codes 0-5, 7, X4 Enable Result Codes 0-7, 10. (Default) X5 Enable Result Codes 0-5, 10, and detect BUSY at OFF HOOK X6 Enable Result Codes 0-6, 10, and detect BUSY at OFF HOOK X7 Enable Result Codes 0-5, 7, 10, and detect BUSY at OFF HOOK X8 Enable Result Codes 0-7, 10, and detect BUSY at OFF HOOK. Result Code 0 = OK Result Code 1 = CONNECT Result Code 2 = RING Result Code 3 = NO CARRIER Result Code 4 = ERROR Result Code 5 = CONNECT 1200 Result Code 6 = NO DIALTONE Result Code 7 = BUSY Result Code 8 = NO ANSWER dial modifier is used and quiet answer is not detected within S7) Result Code 9 = CONNECT 0600 Result Code 10 = CONNECT 2400 Result Code 11 = CONNECT 4800 Result Code 12 = CONNECT 9600 Result Code 13 = CONNECT 7200 Result Code 14 = LINE-IN-USE Result Code 22 = CONNECT 75/1200 Result Code 23 = CONNECT 1200/75 bit 7 0 = Pulse dialing make/break ratio = 39/61 (U.S.) (Default). 1 = Pulse dialing make/break ratio = 33/67 (U.K., Hong Kong). This bit has an effect only when S32 or S33 are set to zero S23 - BUSY DETECT CADENCE COUNT (Default = 3) Defines how many busy cadence cycles before sending the busy result code S24 - DESIRED DCE SPEED 0 = Last AT Command Speed 3 = 300 bits/s Page 37 of 74

38 73M2901CE Evaluation Board User s Manual 5 = 1200 bits/s 6 = 2400 bits/s Note: This command only pertains to the DCE speed, and not to Bell or ITU operation. In order to establish ITU or Bell connections, use this command combined with the B command or set S26 bit 7 to obtain the desired modem operation S25 - PROTOCOL SELECTION REGISTER Register S25 reflects the status of certain options. Default Value is 0. Register S25 is a bit mapped register whose bits are defined as follows: Bit 0 Bit 1 1 = Disconnect if No Protocol is detected 1 = LAP-M Protocol Note: In order to perform a connection without protocol negotiation, clear all bits (set to 0). When a connection is made and the selected protocol is detected an appropriate result code is returned: PROTOCOL: NONE or numeric 70 PROTOCOL: LAPM or numeric 77 If no protocol is detected within 1.5 seconds after CARRIER is established, PROTOCOL: NONE or numeric result code 70 will be sent S26 - BIT MAPPED DATA MODE CONTROL REGISTER Register S26 reflects the status of certain options. Register S26 is a bit mapped register whose bits are defined as follows: Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 1 = Force rate change to 1200 bps. 0 = Disables speed negotiation during a retrain request (default). 1 = Enables speed negotiation during a retrain request. 0 = Disables automatic retrain requests (default). 1 = Enables an automatic retrain request to be negotiated. 0 = Disables retrain request response (default). 1 = Enables the modem to respond to a retrain request. 0 = Select 1800 Hz guard tone to be generated during answer mode handshake (default). 1 = Select 550 Hz guard tone to be generated during answer mode handshake (not used in North America). 0 = Disables guard tone generation (default). 1 = Enables guard tone generation. 0 = Disable V.23 turnaround. 1 = Enable V.23 turnaroud. Channel Set: 0 = Tx 1200 bps (Bell 202 and V.23 slave mode) (default). 1 = Rx 1200 bps (Bell 202 and V.23 master mode) S27 - CALL PROGRESS TRANSMIT REGISTER (Default = 0h) Page: 38 of TERIDIAN Semiconductor Corporation Rev 1.5

39 73M2901CE Worldwide Demo Board User s Manual Register S27 reflects the status of certain options. Default is 64. Register S27 is a bit mapped register that behaves in the following manner when its bits are set: Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Do not send DTE 0FFh characters in pseudo sync (Y4 or &Q4) mode. Transmit 1100 Hz when set to one. Transmit 1300 Hz when set to one. Transmit 2100 Hz when set to one. Transmit 2225 Hz when set to one. Disconnect Bit. 0 = CCITT V.22bis, V.22, V.21, V.23 (equivalent to B0) (Default). 1 = Bell103, Bell202, Bell212A (equivalent to B1). Protocol Selection Done (read only). Precedence is as follows: Bit 1 takes precedence over bit 2, which takes precedence over bit 3, which in turn takes precedence over bit S28 - FAST CONNECT, AND CALLING TONE ENABLE (Default = 32h or 33h (reserve bit 0 toggles in idle state)) Register S28 reflects the status of various options. Register S28 is a bit mapped register whose bits are defined as follows: Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Reserved (SAGC Bit). Reserved. Demodulated FSK Microbit. Sync Mode (set by Y1 or Y4). Answer Tone 1200 bps (default). Billing Delay 1200 bps (default). 400 ms. Answer 1200 bps. 0 = Calling Tone Disable (default). 1 = Calling Tone Enable S29 - EXTENDED RESULT SELECTION / CADENCE TYPE SELECTION (default = 88h) Register S29 reflects the status of various options. This register is normally read only since its contents are set by other commands. Register S29 is a bit mapped register whose bits are defined as follows: bits 0/1 0/0 Do not return extended result codes (40-80). The message CONNECT followed by the data rate between the DTE and the modem will be sent to the DTE (W0 command) (default). 0/1 The CONNECT message will report the DTE speed then enable the carrier and extended result codes (W1 command). 1/0 The CONNECT message will report the DCE speed. All extended result codes are disabled (W2 command). Page 39 of 74

40 73M2901CE Evaluation Board User s Manual Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 0 = All Carrier, Protocol and Connect Result Codes enabled if W1 in effect. 1 = All Carrier Result Codes enabled if W1 in effect (No Protocol or Connect Result Codes). 0 = Escape sequence disabled. 1 = Escape sequence enabled. 0 = Alternate cadences for dial tone (default). 1 = Dual cadence for dial tone. 0 = Alternate cadences for busy tone (default). 1 = Dual cadence for busy tone. 0 = Alternate cadences for Ring (default). 1 = Dual cadence for Ring. 0 = Continuous Dial tone Disabled. 1 = Continuous Dial tone S30 - BIT MAPPED HANDSHAKE REGISTER (Default = 6Ch) Bit Decimal Value Hex Value Mode 0 1 $01 4-Wire mode (T) 1 2 $02 Bell $04 V.22 Bis (default). 3 8 $08 V.22 (default) $10 Bell $20 Bell 103 (default) $40 V.21 (default) $80 V.23. The settings in this register determine the handshake method(s) to be attempted (bits 1 7). Precedence from highest to lowest: V.22bis, V.22, Bell 212, Bell 103, V.21, V.23, Bell S31 - BIT MAPPED CONNECT DETECT REGISTER (Default = 00h) The value in this register indicates the DCE speed of the last established connection. This is a read only register. The default value is 0 until connection is established. Bit Decimal Value Hex Value Mode 0 1 $01 Successful 4-Wire Connection. (T) 1 2 $02 Successful Bell 202 Connection 2 4 $04 Successful V.22 Bis Connection. 3 8 $08 Successful V.22 Connection $10 Successful Bell 212 Connection $20 Successful Bell 103 Connection $40 Successful V.21 Connection $80 Successful V.23 Connection. Page: 40 of TERIDIAN Semiconductor Corporation Rev 1.5

41 73M2901CE Worldwide Demo Board User s Manual Note: All bits are zero until a successful connection has been established (carrier detect valid, data mode active). Then the appropriate bit will be set S32 - PULSE DIAL MAKE TIMER (Default = 39) Duration of Pulse Make time in ms. Range is 1 to S33 - PULSE DIAL BREAK TIMER (Default = 61) Duration of Pulse Break time in ms. Range is 1 to S34 - PULSE DIAL INTER-DIGIT TIMER (Default = 75) Duration of Pulse Inter-digit time interval in units of 10 ms. Range is 1 to S35 - CADENCE A MIN ON TIME OF DIAL TONE The value of this register sets the duration of the primary cadence minimum dial tone ON time in units of 40 ms S36 - CADENCE A MAX ON TIME OF DIAL TONE The value of this register sets the duration of the primary cadence maximum dial tone ON time in units of 40 ms S37 - CADENCE A MIN OFF TIME OF DIAL TONE The value of this register sets the duration of the primary cadence minimum dial tone OFF time in units of 40 ms S38 - CADENCE A MAX OFF TIME OF DIAL TONE The value of this register sets the duration of the primary cadence maximum dial tone OFF time in units of 40 ms S39 - CADENCE B MIN ON TIME OF DIAL TONE The value of this register sets the duration of the alternate cadence minimum dial tone ON time in units of 40 ms S40 - CADENCE B MAX ON TIME OF DIAL TONE Page 41 of 74

42 73M2901CE Evaluation Board User s Manual The value of this register sets the duration of the alternate cadence maximum dial tone ON time in units of 40 ms S41 - CADENCE B MIN OFF TIME OF DIAL TONE The value of this register sets the duration of the alternate cadence minimum dial tone OFF time in units of 40 ms S42 - CADENCE B MAX OFF TIME OF DIAL TONE The value of this register sets the duration of the alternate cadence maximum dial tone OFF time in units of 40 ms S43 - CADENCE A MIN ON TIME OF BUSY (Default = 10) The value of this register sets the duration of the primary cadence minimum busy signal ON time in units of 40 ms S44 - CADENCE A MAX ON TIME OF BUSY (Default = 15) The value of this register sets the duration of the primary cadence maximum busy signal ON time in units of 40 ms S45 - CADENCE A MIN OFF TIME OF BUSY (Default = 10) The value of this register sets the duration of the primary cadence minimum busy signal OFF time in units of 40 ms S46 - CADENCE A MAX OFF TIME OF BUSY (Default = 15) The value of this register sets the duration of the primary cadence maximum busy signal OFF time in units of 40 ms S47 - CADENCE B MIN ON TIME OF BUSY The value of this register sets the duration of the alternate cadence minimum busy signal ON time in units of 40 ms S48 - CADENCE B MAX ON TIME OF BUSY The value of this register sets the duration of the alternate cadence maximum busy signal ON time in units of 40 ms S49 - CADENCE B MIN OFF TIME OF BUSY The value of this register sets the duration of the alternate cadence minimum busy signal OFF time in units of 40 ms. Page: 42 of TERIDIAN Semiconductor Corporation Rev 1.5

43 73M2901CE Worldwide Demo Board User s Manual S50 - CADENCE B MAX OFF TIME OF BUSY The value of this register sets the duration of the alternate cadence maximum busy signal OFF time in units of 40 ms S51 - CADENCE A MIN ON TIME OF RING (Default = 40) The value of this register sets the duration of the primary cadence minimum ring ON time in units of 40 ms S52 - CADENCE A MAX ON TIME OF RING (Default = 60) The value of this register sets the duration of the primary cadence maximum ring ON time in units of 40 ms S53 - CADENCE A MIN OFF TIME OF RING (Default = 80) The value of this register sets the duration of the primary cadence minimum ring OFF time in units of 40 ms S54 - CADENCE A MAX OFF TIME OF RING (Default = 120) The value of this register sets the duration of the primary cadence maximum ring OFF time in units of 40 ms S55 - CADENCE B MIN ON TIME OF RING The value of this register sets the duration of the alternate cadence minimum ring ON time in units of 40 ms S56 - CADENCE B MAX ON TIME OF RING The value of this register sets the duration of the alternate cadence maximum ring ON time in units of 40 ms S57 - CADENCE B MIN OFF TIME OF RING The value of this register sets the duration of the alternate cadence minimum ring OFF time in units of 40 ms S58 - CADENCE B MAX OFF TIME OF RING The value of this register sets the duration of the alternate cadence maximum ring OFF time in units of 40 ms. Page 43 of 74

44 73M2901CE Evaluation Board User s Manual S59 - BIT MAPPED REGISTER Register S59 reflects the status of various options. This register is normally used as a read only register. Register S59 is a bit mapped register whose bits are defined as follows: Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 In FSK: Skipped STOP, resync to it. In QAM or PSK: Full equalizer back propagation. 16 way decisions in QAM receiver. Scrambler invert flag ( whether inversion of next modulated bit should occur). Scrambler history bit. De-scrambler invert flag. De-scrambler history bit. Last received bit. Last transmitted bit S60 - BIT MAPPED TEST CONTROL REGISTER Register S60 reflects the status of test control options and the generation of data patterns. Register S60 is a bit mapped register whose bits are defined as follows: Bit 4 Bit 1 SDP1 Bit 0 SDP0 Function Data Mode (default) Send Marks Send Spaces Send Dotting Send S Send S Send Dotting A Send Flags Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Enable detection of dial tone. 0 = Disables the scrambler (default). 1 = Enables the scrambler. 0 = Disables the de-scrambler (default). 1 = Enables the de-scrambler. In RDLB mode. In ALB mode. Note: In V.22 and V.22bis modes, the first pattern out of reset should not be spaces, the scrambler needs to be primed with another pattern S61 - SIGNAL DETECT REGISTER 1 Page: 44 of TERIDIAN Semiconductor Corporation Rev 1.5

45 73M2901CE Worldwide Demo Board User s Manual Register S61 reflects the status of various options. It is only valid in Data mode. Register S61 is a bit mapped register that behaves in the following manner when its bits are set: Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Causes S62 or S65 (J6) to be sent out USER PORT 2 (available in a special test package only). Remote digital loopback enabled (equivalent Carrier detect bit. This bit will be set when conditions for V.24 circuit 104 have been met by the modulation mode being connected. Wait for Calling Tone before sending Answer Tone. In Call Progress: Energy detect bit. This bit will be set if the receive level is above a certain threshold. In Data Mode: Raw Carrier Detect bit. S1 Detect bit. This will be set if S1 (unscrambled 1100 Hz) is detected. This bit is also used to detect a retrain request if connected in V.22 bis or V.22 USB1 Detect bit. This will be set if USB1 (unscrambled binary ones) is detected. This bit is also used to detect a remote digital loopback request if connected in V.22 bis or V.22. Bit 7 Causes S63 to be sent out USER PORT 2 (available in a special test package only) S62 - SIGNAL DETECT REGISTER 2 This is a read only register, and it is only valid in Call Progress. Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Detected 1650 Hz (V.21 answer marks). Detected 1300 Hz. Detected 2100 Hz (ITU answer tone). Reserved Detected 2225 Hz (Bell answer tone). Detected 2250 Hz (component of USB1). Detected 1100 Hz (fax calling tone). Detect changes to 1270 Hz at the end of answer Call Progress. Detected 1300 Hz (data calling tone). Detect changes to 980 Hz at the end of answer Call Progress S63 - PRECISE CALL PROGRESS DETECT This is a read only register, and it is only valid in Call Progress. Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Detected f0 (350 Hz). Detected f1 (440 Hz). Detected f2 (480 Hz). Detected f3 (620 Hz). Detected 2130 Hz CAS Tone component. Detected 2750 Hz CAS Tone component. Page 45 of 74

46 73M2901CE Evaluation Board User s Manual Bit 6 Bit 7 Busy tone detection enabled. Call Progress filter #1 detect bit S64 - SIGNAL QUALITY This is a read only register that contains the Signal Mean Square Error (MSE) value calculated during demodulation. Not valid in FSK S65 - DTMF DETECT REGISTER Bit 7 indicates a valid DTMF detection. A register value of zero indicates no detect for the polled application. Bits 6-4 are reserved. Bits 3-0 indicate the tone pair detected. Works with command J6 and bit 7 has to be set in order to be valid. The following tables define DTMF decoding: Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Det Valid Reserved Reserved Reserved DTDET3 DTDET2 DTDET1 DTDET0 DTMF Detect bits Dialed Tone Pair Detected Det Valid DTDET 3 DTDET 2 DTDET 1 DTDET 0 Digit Low Tone (Hz) HighTone (Hz) D * # A B C S66 - WAIT FOR DIALTONE (Default = 8) Sets the maximum number of seconds the modem waits for dial tone. Range is (seconds) S67 - QUALIFY DIALTONE (Default = 120) Sets the minimum duration for dial tone. Range is (1/100 sec). Page: 46 of TERIDIAN Semiconductor Corporation Rev 1.5

47 73M2901CE Worldwide Demo Board User s Manual S68 - TEST TIMER Times how long the self-tests should run in seconds. Range is 0 to S69 - TEST ERROR COUNT Keeps count of how many errors occur during the self-test S70 - AUTO RETRAIN THRESHOLD (Default = 16) Forces auto retrain if threshold is below the mean square error S71 - ORIGINATE MODE FALLBACK TIMER (Default = 6) 0 = The modem does not fall back to Bell103 or V.21. The modem will fall back after the number of seconds this register is set to for any number greater than 0. Range is 0 to S72 - PULSE MAP, CALLER-ID, BLACKLIST Bit 1 Bit 0 Tone Dial Digit: 0, 1, 2, 3, 4, 5, 6, 7, 8, Pulse: 10, 1, 2, 3, 4, 5, 6, 7, 8, Pulse: 10, 9, 8, 7, 6, 5, 4, 3, 2, Pulse: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Enable test pins This option allows the user to control port pins such as CTS, RI, etc. Enable option to generate Wetting-Pulse by pulsing Hook signal for CID. Enable option to go Off-Hook for CID (used for Japan). CID preamble starts with Marks instead of Dots (used for Japan or Type2Snoop mode). Reserved (Used to Disable FSK CID mark/space Twist compensation). Enable blacklist option S73 - CONFIGURATION REGISTER 1 (Default = 30h) Bit 0 Enable teletel SEP codes in V.23. Bit 1 Low Power mode enabled. Bit 2 Clear to Send Signal Control. Bit 3 Reserved (Used internally to indicate Fast running Main state). Bit 4 Reserved (Used internally to indicate Home state). Bit 5 Enable 125 ms delay between AT commands. Bit 6 Adaptive dialing enable. Bit 7 Reserved Page 47 of 74

48 73M2901CE Evaluation Board User s Manual S74 - BILLING DELAY REGISTER (Default = 20) This register sets the duration of billing delay in units of 100 ms. Range is S75 - PRE-DIAL CALL PROGRESS IMPRECISE DETECT LEVEL (Default = 30) S75 determines at what minimum level imprecise call progress tones are detected before dialing. Range is 1 to 96. (a larger value corresponds to a lower signal level). The default value translates into 45 dbm. The dbm level depends on the DAA used. The range is 25 to 45 dbm. Refer to the following table for registers S75 S78. Detect Level (dbm) S75, S76, S77, S78 Value(decimal) S76 - POST-DIAL CALL PROGRESS IMPRECISE DETECT LEVEL (Default = 30) S76 determines at what minimum level imprecise call progress tones are detected after dialing. Range is 1 to 96. (a larger value corresponds to a lower signal level). The default value translates into 45 dbm. The dbm level depends on the DAA used. The range is 25 to 45 dbm. Refer to table under S S77 - PRE-DIAL CALL PROGRESS PRECISE DETECT LEVEL (Default = 30) S77 determines at what minimum level precise call progress tones are detected before dialing. Range is 1 to 96. (a larger value corresponds to a lower signal level). The default value translates into 45 dbm. The dbm level depends on the DAA used. The range is 25 to 45 dbm. Refer to table under S S78 - POST-DIAL CALL PROGRESS PRECISE DETECT LEVEL (Default = 30) Page: 48 of TERIDIAN Semiconductor Corporation Rev 1.5

49 73M2901CE Worldwide Demo Board User s Manual S78 determines at what minimum level precise call progress tones are detected after dialing. Range is 1 to 96. (a larger value corresponds to a lower signal level). The default value translates into 45 dbm. The dbm level depends on the DAA used. The range is 25 to 45 dbm S79 - FSK ORIGINATE CARRIER DETECT LEVEL (Default = 35) S79 determines at what minimum level carrier is detected for originating FSK. Range is 1 to 96. (a larger value corresponds to a lower signal level). The range is 25 to 45 dbm S80 - FSK ANSWER CARRIER DETECT LEVEL (Default = 35) S80 determines at what minimum level carrier is detected for answering FSK. Range is 1 to 96. (a larger value corresponds to a lower signal level). The range is 25 to 45 dbm S81 - DPSK ORIGINATE CARRIER DETECT LEVEL (Default = 40) S81 determines at what minimum level carrier is detected for originating PSK. Range is 1 to 96. (a larger value corresponds to a lower signal level). The range is 25 to 45 dbm S82 - DPSK ANSWER CARRIER DETECT LEVEL (Default = 35) S82 determines at what minimum level carrier is detected for answering PSK. Range is 1 to 96. (a larger value corresponds to a lower signal level). The range is 25 to 45 dbm S83 - QAM ORIGINATE CARRIER DETECT LEVEL (Default = 40) S83 determines at what minimum level carrier is detected for originating QAM. Range is 1 to 96. (a larger value corresponds to a lower signal level). The range is 25 to 45 dbm S84 - QAM ANSWER CARRIER DETECT LEVEL (Default = 35) S84 determines at what minimum level carrier is detected for answering QAM. Range is 1 to 96. (a larger value corresponds to a lower signal level). The range is 25 to 45 dbm S85 - DTMF TRANSMIT LEVEL (Default = 60) S85 determines the maximum value sent to the DAC when sending DTMF tones. Range is 60 to S86 - FLASH ON TIME (!) (Default = 50) This register determines the on time for flash hook (!) in 10 ms. Range is S87 - FLASH OFF TIME (!) Page 49 of 74

50 73M2901CE Evaluation Board User s Manual (Default = 50) This register determines the off time for flash hook (!) in 10 ms. Range is S88 - IMPRECISE FILTER SELECTION Bits 0 through 3 0 to 15 selected imprecise filters for pre-dial. Bits 4 through 7 0 to 15 selected imprecise filters for post-dial. Frequencies are defined as follows: Hex Value Frequency Range $ Hz $ Hz $ Hz $ Hz $F User Defined S89 - DATA SET READY Bits 0 thru 1 N command value Bit 2 Enables Lease Line Operation Bit 3 Enables Off-Hook Energy sensing Parallel pick-up detection (PPU-E) Bit 4 Toggles ring input polarity for PPU-V (Default is RingB active low) Bit 5 Toggles ring input polarity for LIU-V (Default is RingB active low) Bit 6 VFI fast connect originate handshake when specifying Bell 212. Will send FLAGS as part of the handshake when Y1 or Y4 is selected. Bit 7 Reserved S90 - RTS TO CTS TURN-AROUND DELAY (Default = 2) When the N0 command has been issued, register S90 defines the time interval between an OFF to ON transition of RTS and when the modem turns CTS ON. The S90 setting applies to Synchronous modes only. Range is 1 to 254 (X 10 ms). RTS RTS/CTS delay CTS S91 - CALL PROGRESS TRANSMIT LEVEL (Default = 90) S91 determines the maximum value sent to the DAC when sending call progress tones. Range is 60 to 127. Page: 50 of TERIDIAN Semiconductor Corporation Rev 1.5

51 73M2901CE Worldwide Demo Board User s Manual S92 - BIT MAPPED REGISTER (Default = 04h) Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 6 Bit 7 0 = Bell202 / V.23 receiver optimized for flat line. 1 = Bell202 / V.23 receiver optimized for 3002A line (unnecessary in versions 2901CL and later). 0 = Disables DTMF boost 1 = Enables DTMF boost (Sets VREF to 2.25V and TXboost when using 5V power supply). 0 = Disables Pulse dial. 1 = Enables Pulse dial (default). 0 = No Imprecise Tones detected (last tone) 1 = Last value before imprecise tones went off. Ring Bounce 0 = ITU answer tone 180 Degrees Phase Reversal disabled. 1 = For ITU answer tone, 180 Degrees Phase Reversal will occur every 450 ms. 0 = Does not preserve the user changes to the DSP filters between connections (default). 1 = Preserves the user changes to the DSP filters between connections S93 - RING INTERVAL REGISTER (Default = 20) The value in this register sets the duration of the minimum ring interval in units of 10 ms. Range is 1 to S94 - TIES ESCAPE PROMPT DELAY TIMER REGISTER (Default = 100) The value in this register sets the duration of delay in units of 10 ms. Range is 1 to S95 - CALLER-ID CONFIGURATION REGISTER (Default = 88h) Bit 0 Dual Tone Alert Signal expected. Bit 2:1 Number(0-3) of Line Reversal and/or Ring Pulse Alert Signals expected before Caller-ID. Bit 3 CID expected between 1 st and 2 nd Power Rings. Note: bits 0 through 3 of S95 are ignored if bit 7 = 0. Bit 4 Enables Caller-ID option. This bit applies only to On-Hook/Offline/Type I Caller-ID. Bit 5 0 = FSK modulation used for CID. 1 = DTMF type Caller-ID. Bit 6 Enables using USER 11output to signal DAA to enter CID state during measure_dc_offset in IDLE mode. Bit 7 Enables using USER11 output to signal DAA to enter Idle-line signaling state for CID. Bit 7 = 0 sets continuous CID mode where S95 bits 0, 1, 2, and 3 are ignored. Also enables using USER 11 output to signal DAA to enter idle line signaling state for LIU-E detection. Special modes: S95 = 0X B FSK Continuous Caller ID mode. S95 = 0X110000B Send detected DTMF codes to DTE without CID: message. S95 = B Detect US Type 1 and Type2 Snoop CID simultaneously. In this mode the modem may automatically modify S72 register bit 5 to look for Dots (Type1) or marks (Type 2 Snoop). Page 51 of 74

52 73M2901CE Evaluation Board User s Manual S99 - COUNTRY CODES REGISTER (Default = 1) S99 allows the 73M2901CE to be set up for different countries by using a single command. By changing the configuration of S99, the dial tone, busy tone detection as well as DTMF and pulse timings are modified. No other commands are needed to program the country requirements of the countries supported by register S99. Since the S99 register affects multiple registers, it should be set at the beginning of the AT String (but after the F command. I.e., ATFS99=1). 0 = CTR 21 (Euro community) 1 = U.S.A. / Canada (Default = 1) 33 = France 34 = Spain 39 = Italy 44 = U.K. 49 = Germany 61 = Australia 81 = Japan S100 - IDIR (Default = 158) External Interrupt direction Register S101 - USR1x I/O (Default = 195) USR1x I/O Port status and control. When read, outputs the current status of USR1 port. When defined as an output, a user port pin will assume the state written to it S102 - DIRECTION CONTROL FOR USR1x (Default = 4) USR1x Port Direction. If a bit is set to 0, the corresponding port pin is an output. If it is a one, the corresponding port pin is an input. USR10=1, USR11=2, etc S103 - USR2x I/O (Default = 254) USR2x I/O Port status and control. When read, outputs the current status of USR1 port. When defined as an output, a user port pin will assume the state written to it. Only USR20 is accessible S104 - DIRECTION CONTROL FOR USR2x (Default = 1) USR2x Port Direction. If a bit is set to 0, the corresponding port pin is an output. If it is a one, the corresponding port pin is an input. USR20=1. Page: 52 of TERIDIAN Semiconductor Corporation Rev 1.5

53 73M2901CE Worldwide Demo Board User s Manual S105 - DELAY AFTER ANY CALL ATTEMPT (Default = 5) Sets the minimum delay between any call attempts of any phone number. Range is (second). Used for blacklisting S106 - DELAY BETWEEN 1 ST AND 2 ND ATTEMPT (Default = 5) Sets the minimum delay between 1 st and 2 nd call attempt of the same phone number. Range is (second). Used for blacklisting S107 - DELAY BETWEEN N TH AND N+1 TH ATTEMPT (Default = 60) Sets the minimum delay between n th and n+1 th call attempt, after 2 nd try, of the same phone number (second). Used for blacklisting S108 - MAXIMUM SUCCESSIVE FAILED ATTEMPTS (Default = 15) Sets the number of maximum failed attempts to the same phone number before it is blacklisted S109 - DELAY BETWEEN SERIES (RE-ENABLE DELAY) Sets the value of minimum delay, since the 1 st attempt, before re-enabling calls to a specific number. A special value of 0 means that numbers are never re-enabled once blacklisted. Range is (minutes) S110 - LINE-IN-USE CONFIGURATION REGISTER (Default = 70h) Bit 0 Bit 1 Bit 2 Bit 3 Enables Off-Hook Voltage sensing Parallel pick-up detection (PPU-V). Enables On-Hook Line-In-Use Voltage sensing detection (LIU-V). Enables On-Hook Line-In-Use Energy sensing detection (LIU-E). Enables Call-Waiting Caller-ID option. This bit applies only to Off-Hook/Online/Type II Caller-ID. Bit 4 Enables HiZ TXAN/TXAP while looking for CID (only for 2901; no effect for 2909). Bit 5 Enables RxGain (20 db) while looking for CID (only for 2901; no effect for 2909). Bit 6 Enables using USER10 output to signal DAA to activate on-hook LIU-V sensing. Bit 7 Enables long space disconnect option. When enabled, the 73M2901CE sends 3.5 seconds of space bits (zeros) before disconnecting after receiving an on-hook command from the DTE. When enabled the 73M2901CE disconnects and goes on-hook upon receiving NULL characters from the remote modem for 1.5 seconds. Page 53 of 74

54 73M2901CE Evaluation Board User s Manual States Polling of Line-in-Use signal Action if LIU is active Returned code to DTE Idle mode or AT command processing other than ATD ATD command processing wait for dial tone or wait for blind dial delays Pulse dialing Tone dialing Call progress phase No Yes Yes No Yes Yes Yes N/A N/A No seizing of the phone line Line-inuse Release of the line N/A Release of the line Release of the line Connected phase Release of the line Line-in-use N/A Line-inuse Line-inuse Line-inuse S111 - LINE-IN-USE SETTLE TIME (Default = 20) Sets the settling time to wait, after the LIU sensing circuit is enabled, before sampling LIU signal. This is used for both on-hook(voltage sensing LIU) and off-hook(ppu) detection. Range is (X10ms units) S112 - LINE-IN-USE ENERGY DETECTION WAIT (Default = 20) Sets the qualify time that Energy must remain below threshold. Range is (X100ms units) S113 - LINE-IN-USE ENERGY DETECTION THRESHOLD (Default = 15) Sets the Threshold for the voice Energy. Lower number means Stronger signal strength. The value of 0 would effectively never detect and higher than 95 would always detect. This register is also used by (J7) test mode as a minimum carrier detect threshold. Range is S114(HI)-S115(LO) - MAXIMUM CARRIER DETECT THRESHOLD (J7) (Defaults: HI = 0, LOW = 50h) Sets the maximum carrier detect threshold used by (J7) test mode. Higher value may indicate open circuit in either TXAP or TXAN signals to RXA S116 - PARALLEL-PICK-UP ENERGY DETECTION THRESHOLD (Default = 50h) Sets the Threshold for PPU to detect loss of Energy compared to the energy level at the time of connection. Use 48h/50h/5Ah for 1/2/3dB loss of Energy when parallel phone is picked up S117 - NO ACTIVITY TIMEOUT Sets the duration for the no activity timeout option. Resolution is in seconds. Range is When set to zero the no activity timeout option is disabled. When enabled, values of S117 >= to 15 are recommended. Page: 54 of TERIDIAN Semiconductor Corporation Rev 1.5

55 73M2901CE Worldwide Demo Board User s Manual S118 - CALLER ID RING INTERRUPT DELAY (Default = 20) Disables ring interrupt detection for the specified period of time during CID enable/disable transitions, measured in ms S119 - WAIT BEFORE CONNECT (Default = FFh) Allows programmable delay between completion of handshake and connect (ready for data). User should be careful, Host will have to complete delay period before transmitting data. Setting the value at this register will affect timing for all modes. Resolution is in 10 ms increments. The Default delay times are as follows: QAM Answer Mode = 200 ms PSK Answer Mode = 770 ms PSK Originate Mode = 770 ms FSK Originate Mode = 300 ms NOTE: Special mode when S119 = $FF (Default), uses same value of wait as in the past S120 - ACCEPTED ANSWER TONE FREQUENCIES (Default = $35) Enables control over what the modem will qualify as answer tone. By default, the modem functions as it has in the past. Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 ) Bit 5 Bit 6 Bit Hz V21 Marks (default) 1300Hz V23 Marks 2100Hz ITU Answer Tone (default) Reserved 2225Hz Bell Answer Tone (default 2250Hz S0 (default) Reserved Reserved S121 - ANSWER TONE QUALIFY TIME The value of this register extends the answer tone qualification time beyond the 155ms minimum in 10ms units. For example a value of 10 would yield a total answer tone qualification time of 255 ms ( 100ms + 155ms ) S122 - PARALLEL PICK UP DEBOUNCE TIMER Sets the duration of the parallel pick debounce timer in 10ms increments. Page 55 of 74

56 73M2901CE Evaluation Board User s Manual S123 - SOFT RING DETECT This register controls the ring amplitude threshold and selects hardware or software ring detection. Bit Map: Bits 0-6 Bit 7 Ring Amplitude Detection Threshold. Lower value detects lower amplitude ring signal. 1 = No frequency checking, enables Phonex operation. 0 = Frequency and amplitude checking, normal operation. Special Values: S123 = 0 S123 = 255 S123 = Disable soft ring detect, use hardware ring. Auto detect phonex mode, the modem will automatically detect an user phonex system and configure itself accordingly. Force soft ring detection with frequency qualification for non-phonex operation. Recommend value of 7 (or 2 for very Low Amplitude and Frequency detection). S123 = Force soft ring detection with no frequency qualification for phonex operation. Recommend value of S124 - V23 HALF DUPLEX ENABLE Bit 0 Selects V.23H 1200 bps Half Duplex mode. Bit 1-7 Reserved Page: 56 of TERIDIAN Semiconductor Corporation Rev 1.5

57 73M2901CE Worldwide Demo Board User s Manual 5 5 WORLD-WIDE MODEM DESIGNS WITH THE 73M2901CE 5.1 WORLDWIDE DEMO BOARD OVERVIEW It is possible to design a modem that can be used in virtually any country without the need to fit different hardware for different countries standards. One of the more significant differences between countries is the line impedance match that is required. This termination can be a concern since poorly matched impedances will affect the network by increasing the reflections and crosstalk. Therefore, there are different terminations required in different countries to match the equipment impedance to the local network s characteristics. Worldwide countries use three basic network models (Tables 4and 5). In the U.S and North America, a 600 Ω resistive termination is used. Many other counties also use this termination. In most of Europe, the primary termination is a complex AC impedance commonly called CTR-21. This is also used in other countries outside of Europe. The third network model is for Australia and New Zealand. There are other concerns such as transmit levels, ring frequencies and levels, call progress tone frequencies and cadence, and network protection. The first four of these are all programmable through the 73M2901CE S registers. The last can be taken care of by designing for the most stringent specifications. Keep in mind that the overall cost of components will tend to be higher since components with higher ratings will cost more. If Australia and New Zealand are on your list of target countries, then design your protection for them. Australia and New Zealand have higher isolation voltage requirements than other countries (3750V DC) and require that the transformer be encapsulated. Any other devices that cross the isolation barrier, such as opto-couplers, must also meet this requirement. They also have somewhat larger creapage and clearance requirements to match their isolation requirements. The network input protection is now standard, so finding components that that meet worldwide requirements are not too difficult. Input current limiting and over-voltage protection are both universally required or advised. It is possible to pass PTT testing in some cases without current limiting, but you put the integrity and survivability of your product at jeopardy by not using it. Self-resetting PPTC fuses are now available that not only protect the product but eliminate the need to replace parts if they are tripped. 5.2 USING THE 73M2901CE CTR-21 DEMO BOARD The schematic in Figure 6-1 shows a way to change the termination using the USR pins of the 73M2901CE. The user pins control the analog switches that determine the termination impedance. The user pins in some cases may be used for other purposes or must be set to specific state to cause the modem to work in certain modes. Termination WW DAA 600 Ohm WW DAA CTR21 WW DAA Australia Initialization String ATS102-3S104-1S95-128S110-64S101+1S101-2S103-1 ATS102-3S104-1S95-128S110-64S101-1S102-2S103+1 ATS102-3S104-1S95-128S110-64S101-1S102+2S103-1 Table 5-1 S Register Settings for Worldwide Modem Design in Figure 6 An example of this is the USR11 pin. If it is set to the low state, the modem will be in the continuous Caller ID mode. If this is not what you need, you can set the modem termination just before going off hook. Table 5-1 shows the initialization strings needed for the 73M2901CE Worldwide demo board in Figure 6-1. If you choose to rearrange the USR controls in your design, the string settings will need to be changed. Termination Component Values 600 Ohm 600Ω CTR Ω 150nF + 270Ω Australia 820Ω 120nF + 220Ω Table 5-2 Termination Impedance Network Values Page 57 of 74

58 73M2901CE Evaluation Board User s Manual COUNTRY AC Impedance COUNTRY AC Impedance COUNTRY AC Impedance Argentina 600 Hong Kong 600 Oman 600 Australia Aust. Hungary 600 Pakistan 600 Austria Aust. Iceland CTR-21 Peru 600 Bahrain CTR-21 India Aust. Philippines 600 Belgium CTR-21 Indonesia 600 Poland 600 Brazil 600 Ireland CTR-21 Portugal CTR-21 Bulgaria Aust. Israel CTR-21 Romania 600 Canada 600 Italy CTR-21 Russia 600 Chile 600 Japan 600 Saudi Arabia 600 China 600 Jordan 600 Singapore 600 Columbia 600 Kazakhstan 600 Slovakia Aust. Croatia CTR-21 Kuwait 600 Slovenia CTR-21 CTR/TBR 21 CTR-21 Latvia CTR-21 S. Africa CTR-21 Cyprus CTR-21 Lebanon CTR-21 S. Korea 600 Czech Rep. CTR-21 Luxembourg CTR-21 Spain CTR-21 Denmark CTR-21 Macao 600 Sweden CTR-21 Ecuador 600 Malaysia 600 Switzerland CTR-21 Egypt 600 Malta CTR-21 Syria 600 El Salvador 600 Mexico 600 Taiwan 600 Finland CTR-21 Morocco CTR-21 Thailand 600 France CTR-21 Netherlands CTR-21 UAE 600 Germany Aust. New Zealand Aust. UK CTR-21 Greece CTR-21 Nigeria CTR-21 USA 600 Guam 600 Norway CTR-21 Yemen 600 Table 5-3 Worldwide Country AC Impedance Requirements M2901CE S99 COUNTRY CODE SUPPORT A feature of the 73M2901 family of modem ICs is the country configuration register S99. This register can be used to program a variety of country parameters with a single register setting (See the 73M2901CE AT command set in section 4). If not all the countries you are interested in are listed for S99, the individual parameters can still be programmed through the S registers. The appendix contains tables with all the register settings controlled by S99. By finding the country with the settings closest to what are required, you can minimize the number of registers that need to be programmed. The following information can be used to tailor the behavior of the 73M2901CE for specific country support for countries not listed for S99. Additional details can be found in Section RING DETECTION PARAMETERS The ring detector is programmable in a number of ways. S registers S17 and S18 control the frequency range of the ring frequencies that are valid. Ringing tones outside these settings will not be detected. S registers S51-S58 determine the cadences (on and off timing of the tones) that are allowed. Either one of two different cadences can be accepted or a dual cadence can be defined, depending on the setting of bit 6 in register S29. S123 enables the energy ring detection feature. With S123 set to 0 energy ring detection is disabled and the optocoupler input is used as in the 73M2901CL. With S123 set to a non-zero number the amplitude threshold and whether the ring frequency is checked can be controlled DIAL TONE PARAMETERS Page: 58 of TERIDIAN Semiconductor Corporation Rev 1.5

59 73M2901CE Worldwide Demo Board User s Manual The dial tone parameters can also be controlled over a wide range. S29 controls whether a continuous dial tone (bit 7=1, the default), one of two different single cadences (bit 4=0, default) or a dual cadence (bit 4=1) dial tone will be detected. Registers S35 S42, control the two cadences on and off times. There is also control for the tones that are detected as valid. Register S20 controls whether precise frequencies will be detected or a band of frequencies selected as a valid tone. S20 also selects whether an individual tone or all tones selected by S19 must be detected. The low nibble of register S19 selects which tones will be used for dial tone detection. Register S88 selects the imprecise frequency range for imprecise detection mode. In addition register S66 determines the maximum time to wait for dial tone, S67 the tone qualification duration, and S75 and S77 select the minimum level for detection for imprecise and precise tones, respectively BUSY TONE PARAMETERS The busy tone parameters can also be controlled over a wide range. S29 controls whether one of two different single cadences (bit 5=0, default) or a dual cadence (bit 5=1) dial tone will be detected. Registers S43 S50, control the two cadences on and off times. There is also control for the tones that are detected as valid. Register S20 controls whether precise frequencies will be detected or a band of frequencies selected as a valid tone. S20 also selects whether an individual tone or all tones selected by S19 must be detected. The high nibble of register S19 selects which tones will be used for busy tone detection. Register S88 selects the imprecise frequency range for imprecise detection mode. In addition registers S76 and S78 select the minimum level for detection for imprecise and precise tones, respectively PULSE DIALING Registers S32 through S34 control the timing of pulse dialing. S32 sets the duration of off hook switch closure (make time). S33 controls the off hook open time (break time). S34 controls the time between digits. S32 and S33 times are in ms, while S34 is in 10 ms increments. Some countries use different pulse patterns to represent the digits, so S72 can be used to set the pulse pattern so digits are correctly sent. The default is the most common, where the digit equals the number of pulses, except for 0, which is 10 pulses. See Section 4 for additional details DTMF DIALING DTMF on and off timing can be adjusted by S11. The requirements for the timing can vary with different countries. The DTMF transmit levels can be adjusted using the upper nibble of register S13 and the twist (level of the lower frequency relative to the higher frequency) can be changed using S12 bits 4-6. Additional adjustment of the transmit level is provided by S85, but setting S85 at too high of a level can also increase the THD, so restraint is advised. DTMF should be transmitted at the highest level allowed by country specific limitations, but do not exceed this limit CALLING TONE Calling tone is enabled by setting S28 bit 7 to one. S15 sets the calling tone off time in 100 ms increments and S16 sets the calling tone on time in 10 ms increments CALL PROGESS AND DATA CARRIER TRANSMIT LEVELS The levels for the carrier and call progress tones (calling tone, answer tone) can be adjusted using the lower nibble of S13. This can be used to compensate for transmit path losses and to adjust for the highest transmit levels allowable with a particular hardware configuration and country limitation. The call progress and data levels can only be changed in 2 db increments, therefore S13 bit 3 is ignored CALLER ID TYPE I AND TYPE II The 73M2901CE supports worldwide Caller ID (CID) standards. Most of the CID controls are in register S95, but some are also found in other registers. Looking for the Japanese CID and Type II snoop mode Marking preamble are controlled by S72 bit 5. S72 bit4 controls Japanese on-hook CID mode. CID wetting pulse control is controlled by S72 bit 3. Type II CID is enabled with S110 bit 3. When a Type II CID message is detected, the modem will go back on hook after the message is retrieved. Page 59 of 74

60 73M2901CE Evaluation Board User s Manual Register S95 controls all other aspects of the CID mode, such as FSK or DTMF CID, alerting tone detection, the number of line reversals or rings before CID is expected, and enabling CID. There is also a continuous CID mode and a DTMF receive mode without a preceding CID: so DTMF digits can be detected. When S95 is set to 99 Hex (ATS95=$99) both US Type I and Type II snoop mode are enabled ITU ANSWER TONE PHASE REVERSALS The 73M2901CE supports ITU answer tone 180º phase reversals during the handshake. Setting S92 bit 6 enables phase reversals and is set to zero by default (no phase reversals) BPS FAST CONNECT MODE The 73M2901CE supports the fast connect handshake used in POS terminal applications. Both Bell 212A and V.22 fast connect are supported fro the calling side. It does not support the answering fast connect as exactly defined, but the Ln commands can be used to shorten the handshake time. To use the calling fast connect handshake, Set register S89 bit 5 (ATS89+64) and set register S30 to Bell 212A only (ATS30=16). This applies to both Bell 212A and V.22 since the originating side handshake is the same for both modes. Setting S30 to any other value will override the originate fast connect mode. The originating fast connect mode will send flags instead of marks if the modem is set for synchronous mode (Y1 or Y4). For the answering side, the L1 command will bypass the billing delay and answer tone to significantly speed up the handshake. This will work with the originating Bell 212A or V.22 fast connect or normal connect, as well as the standard V.22bis connection. Of course the fastest connections will be with Bell 212A and V.22 operating in the fast connect mode. L2 will still used the 2-second billing delay, but the 2-second answer tone will not be sent. L3 will use the normal billing delay, and send a short 400 ms answer tone. L1 will give the fastest handshake with the 1200 bps originate fast connect mode enabled. Page: 60 of TERIDIAN Semiconductor Corporation Rev 1.5

61 73M2901CE Worldwide Demo Board User s Manual 6 6 USING THE 73M2901CE WORLDWIDE DEMO BOARD: HARDWARE DESIGN This section includes the following tables and drawings of the PCB for the Evaluation Board: - Demo Board schematic - Mother Board Schematic - Connector pin definitions - Bill of Materials - Silk screen layer Top side - Metal Layer Top side - Metal Layer Bottom - Package Outlines Page 61 of 74

62 73M2901CE Evaluation Board User s Manual 6.1 SCHEMATIC DIAGRAMS Figure 6-1 TERIDIAN 73M2901CE Worldwide Demo Board: Daughter Board Schematic L1 NLC322522T-4R7M TB03100M Thyristor Diodes, Inc. L2 NLC322522T-4R7M E1 1 F1 MF-R015/600 PTC fuse Bourns C22 3.3uF J2 RJ BR1 HD04 4 C uF 100V R23 120K Q4 FZT605CT R12 3 R25 NC 18 1/4W R8 2 30K - C uF 100V R9 30K RING/CIDdetection D1 RS1G + C21 3.3uF U4 TLP T1 EMIT4033 Sumida 3 2 R20 20K 4 1 VCC3_3D 1 2 HOOK C20 120nF AUST R U2C 74LVC4066 C25 CTR nF U2B 74LVC4066 US R R U2A R LVC4066 R15 5.1K R13 C26 21K.082uF C24 3.3uF VCC3_3A C9 10uF C uF R Y MHz C3 33pF C2 27pF -To use the programmable termination: For all: S102-3, S104-1, S95-128, S Ohm termination: S101+1, S101-2, S103-1 Australian termination: S101-1, S101+2, S103-1 CTR-21 termination: S101-1, S101-2,S103+1 C13 VCC3_3D VCC3_3D C12 3.3uF C14 C11 3.3uF + 0.1uF 0.1uF L3 NLC322522T-4R7M VND OSCOUT OSCIN VPD N/C VND TXD TXCLK 16 VNA 15 RXA VBG VREF 12 TXAP TXAN 11 VPA 10 9 RESET VPD RXD RXCLK DTR USR20 RING RELAY RI CTR-21 RXDB DTRB TXDB RIB DCDB DSRB CTSB RTSB VCC3_ J1 C8 0.1uF C7 0.1uF U1 8 USR10 7 USR11 RTS 6 CTS 5 DSR 4 3 DCD VPD 2 VND 1 VCC3_3A 2901CE_QFN/TQFP32 US600 AUST L4 NLC322522T-4R7M VCC3_3D + C1 10uF C5 C6 3.3uF + 0.1uF R1 10K VCC3_3D Page: 62 of TERIDIAN Semiconductor Corporation Rev 1.5

63 73M2901CE Worldwide Demo Board User s Manual Figure 6-2 TERIDIAN 73M2901CE Worldwide Demo Board: Mother Board Schematic J1 RJ TP2 TIP TP4 TIP TP3 RING RS-232 DB25 VCC J3 1 TP13 V+ DCD DTR TP1 RING2 U1 MAX3237E 28 C2+ C1+ 27 GND V+ C2- VCC V- C1- T1OUT T1IN 24 T2OUT T2IN 23 T3OUT T3IN R1IN R1OUT 20 R2IN R2OUT T4OUT T4IN R3IN R3OUT T5OUT T5IN EN R1OUTB SHDN MBAUD 15 1 TP5 RI 1 3 U2 LM IN OUT 1 GND 2 5VDC IN 3 S 2 O 1 J2 POWER CONNECTOR J11 CON-10 1 TP12 DTR VCC D1 DTR 1 TP14 GND RXDB DTRB TXDB RIB DCDB DSRB CTSB RTSB 1 TP6 DSR 1 TP7 DCD 1 TP8 CTS 1 TP9 TXD 1 TP11 RTS 1 TP10 RXD D2 RTS D3 RXD J7 CON-4 I RI DSR CTS RTS RXD TXD C1 0.1uF VCC R4 330 TP15 GND R9 NC C4 0.1uF C5 0.1uF R10 0 Ohms C3 0.1uF C2 0.1uF D8 RI D7 DSR D6 DCD C8 C7 0.1uF 10UF C9 R6 330 D5 CTS D4 TXD + C6 10uF R1 330 R3 330 R7 330 R5 330 VCC R uF R8 330 VCC Page 63 of 74

64 73M2901CE Evaluation Board User s Manual Figure M2901CE Worldwide Daughter Board Pin Connections RING TIP GND RXD DTR TXD RI DCD DSR CTS RTS VCC3_3 Page: 64 of TERIDIAN Semiconductor Corporation Rev 1.5

65 73M2901CE Worldwide Demo Board User s Manual M2901CE DEMO BOARD PIN DESCRIPTION. Table M2901 Worldwide Demo Board Description: Digital Interface Name Pin # Description VCC J V power source for the demo board. Request To Send Low true input. Used for RTS/CTS flow control and V.23 transmission RTS J1-2 control. Controlled by the Kn command. Clear To Send Low true output. Used for RTS/CTS flow control and to indicate carrier is CTS J1-3 being sent in V.23 mode. Controlled by the Kn command. DSR J1-4 Data Set Ready Low true output. Indicates the modem is present and ready for use. DCD J1-5 RI J1-6 Data Carrier Detect Low true output. Indicates a carrier is being received. Controlled by the Cn command. RIng Low true output. Indicates a valid ring signal is being received. Goes low for the duration the ring result code is being sent on RXD. TXD J1-7 Transmit Digital Input. Pin used as the digital data input for commands and data transmission. DTR J1-8 Data Terminal Ready Low true Input. Pin used by the terminal to control certain actions of the modem, such as return to command mode, terminate call, V.23 turnaround, reset, and power down. Receive Digital Output. Pin used as the digital data output for echoing commands and for data RXD J1-9 reception. GND J1-10 Demo board ground Table M2901 Worldwide Demo Board Description: Telephone Network Interface Name Pin # Description TIP 2 J2-1 No Connection TIP J2-2 Polarity independent connection to the telephone network. RING J2-3 Polarity independent connection to the telephone network. RING2 J2-4 No Connection Name Table M2901 Worldwide Demo Board Description: DB-25 RS-232 Level Serial Interface DB-25pin Description Transmit Digital Inverted Input. Pin used as the digital data input for commands and data TXD 2 transmission. Receive Digital Inverted Output. Pin used as the digital data output for echoing commands RXD 3 and for data reception. Request To Send High true input. Used for RTS/CTS flow control and V.23 transmission RTS 4 control. Controlled by the Kn command. Clear To Send High true output. Used for RTS/CTS flow control and to indicate carrier is CTS 5 being sent in V.23 mode. Controlled by the Kn command. DSR 6 Data Set Ready High true output. Indicates the modem is present and ready for use. DCD 8 DTR 20 RI 22 Data Carrier Detect High true output. Indicates a carrier is being received. Controlled by the Cn command. Data Terminal Ready High true Input. Pin used by the terminal to control certain actions of the modem, such as return to command mode, terminate call, V.23 turnaround, reset, and power down. RIng High true output. Indicates a valid ring signal is being received. Goes low for the duration the ring result code is being sent on RXD. Page 65 of 74

66 73M2901CE Evaluation Board User s Manual Table 6-4 TERIDIAN 73M2901CE Worldwide Demo Board: Bill of Material Quant. Reference Part PCB footprint DigiKey # Manufacturer # Manufacturer 1 BR1 HD04 minidip HD04DITR-ND HD04 Diodes, Inc. 2 C1,C9 10uF 0805 PCC2182CT-ND Panasonic 1 C2 27pF 0805 PCC270ACVCT-ND Panasonic 1 C3 33pF 0805 PCC330ACVCT-ND Panasonic 6 C5,C12,C13,C21,C22,C24 3.3uF 0805 PCC1841CT-ND Panasonic 6 C6,C7,C8,C10, C11,C14 0.1uF 0805 PCC1762CT-ND Panasonic CB1812X7R224ZW 2 C18,C19, 0.22uF 100V 1812 T UTC 1 C20 120nF 0805 PCC1906CT-ND Panasonic 1 C25 150nF 0805 PCC1748CT-ND Panasonic 1 C26.082uF 0805 PCC1761CT-ND Panasonic 1 D1 400V fast diode SMA RS1GDICT-ND RS1G Diodes, Inc. 1 E1 Bidirectional Thyristor SMB 1 F1 MF-R015/ mil T.H. 1 J1 CON10 100mil 10 pos. 1 J2 CON4 A9043-ND TISP4350T3BJR, TB03100M 4 L1,L2,L3,L4 NLC322522T-4R7M 1206 TDK 1 Q4 FZT605CT SOT223 FZT605CT-ND ZETEX Bourns, Diodes, Inc Bourns, Raychem 1 R1 10K KHCT-ND Phicomp 2 R8,R9 30K KHCT-ND Phicomp 1 R13 21K KHCT-ND Phicomp 1 R15 5.1K KHCT-ND Phicomp 2 R16,R HCT-ND Phicomp 1 R20 20K KHCT-ND Phicomp 1 R23 120K KHCT-ND Phicomp 1 R HCT-ND Phicomp 1 R FCT-ND Phicomp 1 R HCT-ND Phicomp 1 R HCT-ND Phicomp 1 T1 EMIT4033 EMIT4033 Sumida 1 U1 2901CE QFN/TQFP32 TERIDIAN Semi. 1 U2 Low Ron Analog switch 14 pin SOL 74LVC4066 Philips TLP627TP1CT- 1 U4 TLP627 DIP ND Toshiba 1 Y MHz 200 mil T.H. CTX409-ND Page: 66 of TERIDIAN Semiconductor Corporation Rev 1.5

67 73M2901CE Worldwide Demo Board User s Manual 6.3 PCB LAYOUT Figure 6-4TERIDIAN 73M2901CE Worldwide Demo Board Demo Board: Bottom Layer Figure 6-5 TERIDIAN 73M2901CE Worldwide Demo Board Demo Board: Top Layer Page 67 of 74