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Silicon Laboratories SI2493/57/34/15/04, SI2494/39 Figure 2. Asychronous UART Serial Interface Timing Diagram, Table 18. DTE Rates

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AN93

20 Rev. 1.3

The UART interface synchronizes on the start bits of incoming characters and samples the data bit field and stop

bits. The interface is designed to accommodate character lengths of 8, 9, 10, and 11 bits giving data fields of 6, 7,

8, or 9 bits. Data width can be set to 6, 7, or 8 bits with the AT\Bn command. Parity can be set to odd, even, mark,

or space by the AT\Pn command in conjunction with AT\B2 or AT\B5. Other AT\Bn settings have no parity.

Figure 2. Asychronous UART Serial Interface Timing Diagram

2.2.3.2. Autobaud

When set in UART interface mode, the ISOmodem includes an automatic baud rate detection feature that allows

the host to start transmitting data at any standard DTE rate from 300 bps to 307.2 kbps. This feature is enabled by

default. When autobaud is enabled, it continually adjusts the baud rate, and the ISOmodem always echoes result

codes at the same baud rate as the most recently received character from the host. Autobaud can be turned off

using AT commands \T0 through \T15, and \T17. Host software should disable autobaud operation once the DTE

rate has been established. This prevents transients on TXD to cause inadvertent baud rate changes.

Autobaud is off when dialing, answering, and in data mode. When autobaud mode is off, the baud rate is set to the

most recently-active baud rate prior to entering one of these states. When autobaud mode is on, autoparity is

performed when either “at” or “AT” is detected. Autoparity detects the formats listed in Table 19.

Table 18. DTE Rates

Ideal DTE Rate (bps) Actual DTE Rate (bps) Approximate Error(%)

300 300

600 600

1200 1200

2400 2400

7200 7202 0.01

9600 9600

12000 12003 0.02

14400 14400

19200 19200

38400 38400

57600 57488 0.2

115200 115651 0.4

230400 228613 0.8

245760 245760

307200 307200

D1D0 D2 D3 D4 D5 D6 D7

START

BIT

MARK STOP

BIT

BIT TIMES

BIT SAMPLING

SPACE

D1D0 D2 D3 D4 D5 D6 D7

START

BIT

MARK STOP

BIT

BIT TIMES

BIT SAMPLING

SPACE D8

Contents

Main AN93 Si2493/57/34/15/04 (Revision D) and Si2494/39 Modem Designers Guide Figure 1.Functional Block Diagram 1. Introduction Page AN93 T ABLE OF C Section Page Page Page Page Page Page AN93 Table 3. Carriers and Tones Table 4. ISOmodem Capabilities 2. Modem (System-Side) Device 2.1. Resetting the Device Page Table 5. SOIC-16 Reset-Strap Options Table 6. TSSOP-24 UART-Interface Options Table 7. TSSOP-24 Parallel-Interface Options Table 8. TSSOP-24 SPI-Interface Clock-Frequency Options Table 9. Reset Strapping Options for QFN Parts with UART Operation Table 10. Reset Strapping Options for QFN parts with SPI Operation Table 11. 2.2. System Interface Table 12. Pin Functions vs. Interface Mode (SOIC-16) Table 13. Pin Functions vs. Interface Mode (TSSOP-24) Table 14. Pin Functions vs. Interface Mode (QFN-38) Table 15. UART-Interface Signals Table 16. SPI-Interface Signals Table 17. Parallel-Interface Signals Figure 2. Asychronous UART Serial Interface Timing Diagram Table 18. DTE Rates Table 19. Serial Formats Detected in Autobaud Mode Page Figure 5. UART Serial Interface Page Table 21. Hardware Interface Register Bit Map Table 22. Hardware Interface Register1 Table 23. Parallel Interface Signals Page Page 2.3. Isolation Capacitor Interface 2.4. Low-Power Modes 2.5. SSI/Voice Mode (24-Pin TSSOP and 38-Pin QFN Only) Figure 10. Voice Mode Block Diagram Table 25. SSI Interface Pin Connection 2.6. EEPROM Interface (24-Pin TSSOP and 38-Pin QFN Only) Table 26. EEPROM Commands Table 27. EEPROM Status Register (Any Other Bits are Unused) Table 28. EEPROM Timing Figure 11. EEPROM Serial I/O Timing Table 28. EEPROM Timing Figure 12. Three-Wire EEPROM Connection Diagram HOST SPIEEPROM TELEPHONELINE SI/SO CS SCLK MODEM Page Page Table 29. Combination Example Table 30. ASCII Chart 3. DAA (Line-Side) Device 3.1. Hookswitch and DC Termination Figure 13. FCC Mode I/V Characteristics DCV[1:0] =11, MINI[1:0] =00 Figure 14. TBR21 (Legacy) Mode I/V Characteristics DCV[1:0] =11, MINI[1:0] =00 3.2. AC Termination 3.3. Ringer Impedance and Threshold 3.4. Pulse Dialing and Spark Quenching 3.5. Line Voltage and Loop Current Sensing Table 31. AC Termination Settings for the Si3018 Line-Side Device Figure 15. Typical Loop Voltage LVS Transfer Function Figure 16. Typical Loop Current LCS Transfer Function ILIM = 1 ILIM = 0 3.6. Legacy-Mode Line Voltage and Loop Current Measurement 3.7. Billing Tone Detection 4. Hardware Design Reference 4.1. Component Functions Page Figure 17. Billing-Tone Filter Table 33. Optional Billing Tone Filters Component Values No Ground Plane In DAA Section Hookswitch/DCT EMI/EMC Figure 18. Si3018/10 Component Functions ISOcap Capacitors 4.2. Schematic Note: See Section "10.4.2. Safety" for information regarding the use of a fuse or PTC resistor. No Ground Plane In DAA Section Figure 19. Si3018/10 Schematic 4.3. Bill of Materials 4.4. Layout Guidelines Figure 20. Reference Placement Figure 21. Illustrated Layout Guidelines Table 34. Layout Checklist This is not a complete schematic. Only critical component placement and nets are drawn. Note: Encircled references are described in the numbered paragraphs in Appendix A. *Note: Do NOT use ferrite beads in place of R12 and R13. Page Table 34. Layout Checklist (Continued) Figure 22. Modem Module VCC and RESET Filter 4.5. Analog Output Figure 23. PWM Audio Processing and Amplifying Circuit Figure 24. Audio Filter Response 5. Modem Reference Guide 5.1. Controller 5.2. DSP 5.3. Memory 5.4. AT Command Set Table 35. Configuration Status Table 36. Command Examples Table 37. Multiple AT Commands on a Single Line Table 38. Consecutive U-Register Writes on a Single Line Table 39. Basic AT Command Set Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page 5.5. Extended AT Commands Table 40. Extended AT& Command Set Table 40. Extended AT& Command Set (Continued) Page Table 41. Extended AT% Command Set Table 42. Extended AT\ Command Set Table 41. Extended AT% Command Set (Continued) Page Table 42. Extended AT\ Command Set (Continued) Table 43. Result Codes Page Table 43. Result Codes (Continued) Table 44. Disconnect Codes 5.6. S Registers Table 45. S-Register Descriptions Page Table 45. S-Register Descriptions (Continued) 5.7. U Registers Table 46. U-Register Descriptions Page AN93 Page Page 5.7.1. U-Register Summary Table 47. Bit-Mapped U-Register Summary Table 48. U0U16 (Dial Tone Registers) Table 49. U17U30 (Busy Tone Detect Registers) Table 50. BPF Biquad Values Page Table 51. Ringback Cadence Registers Table 52. Dial Tone Timing Register Table 53. Pulse Dial Registers Table 54. DTMF Dial Registers Table 55. Ring Detect Registers Table 56. Register U4D Bit Map Table 57. Pre-Dial Delay Timer Register Table 58. Flash Hook Time Register Table 59. Loop Current Debounce Registers Table 60. Transmit Level Register Table 61. U53 Bit Map Table 62. U54 Bit Map Table 63. U62 Bit Map Table 64. U63 Bit Map Table 63. U62 Bit Map (Continued) Table 65. U65 Bit Map Table 65. U65 Bit Map (Continued) Table 66. U66 Bit Map Table 67. U67 Bit Map* Table 68. U68 Bit Map* Table 67. U67 Bit Map* (Continued) Table 69. U6A Bit Map* Table 70. U6C Bit Map Table 71. U6E Bit Map Table 72. U6F Bit Map Table 73. U70 Bit Map Page Table 74. U76 Bit Map Table 75. U77 Bit Map Table 76. U78 Bit Map Table 77. Monitor Mode Values Table 78. U79 Bit Map Page Page Page Page 5.8. Firmware Upgrades 5.9. Escape Methods Table 82. Load Technique and Speed Table* Figure 27. +++ Escape Timing Figure 28. 9th Bit Escape Timing +++ Leading Guard Time UART Timing for Modem Transmit Path (9N1 Mode with 9th Bit Escape) 5.10. Data Compression 5.11. Error Correction 5.12. Wire Mode Table 83. Enabling Error Correction/Data Compression 5.13. EPOS (Electronic Point of Sale) Applications 5.14. Legacy Synchronous DCE Mode/V.80 Synchronous Access Mode 5.15. V.80 Mode Table 84. Synchronous Mode Overview Table 85. Synchronous Access Mode Settings Table 86. EM In-Band Commands and Statuses Table 86. EM In-Band Commands and Statuses (Continued) Table 87. Fast Connect Settings Table 86. EM In-Band Commands and Statuses (Continued) Page Page 6. Programming Examples 6.1. Quick Reference Table 88. Modem Feature vs. Hardware, AT Command and Register Setting 6.2. Country-Dependent Setup Table 89. DC Termination Control Bits Table 88. Modem Feature vs. Hardware, AT Command and Register Setting (Continued) Table 90. Country Initialization Table Page Page Page Page Page Page Page Page Page Page Table 91. International Call Progress Registers Table 92. Dial Registers Table 93. Line Interface/Control Registers Page 6.3. Caller ID Table 94. Caller ID Modes 6.4. SMS Support Table 95. Japan Caller ID Table 96. Protocol 1 Table 97. Protocol 2 Table 98. SMS Commands 6.5. Type II Caller ID/SAS Detection Table 99. MDMF Parameters Table 100. SAS Tone Frequency Table 101. SAS Cadence for Supported Countries* Page Page Page Page Page Page Page Page 6.6. Intrusion/Parallel Phone Detection Page Table 102. Intrusion Detection 6.7. Modem-On-Hold Table 103. Possible Responses to PMHR Command from Remote Modem 6.8. HDLC: Bit Errors on a Noisy Line Table 104. Bit Errors Page Table 104. Bit Errors (Continued) 6.9. Overcurrent Detection 6.10. Pulse/Tone Dial Decision Table 105. Overcurrent Detection Table 106. Automatic Phone Line Configuration 6.11. Telephone Voting Mode 6.12. V.92 Quick Connect Table 107. Possible +PMHT Settings Table 108. AT+PQC Parameters Table 109. AT+PSS Parameters 7. Handset, TAM, and Speakerphone Operation 7.1. Software Reference Table 110. Extended AT+ Command Set Page Page Page Page Table 111. <DLE> Commands (DTE-to-DCE) Table 112. <DLE> Simple Events (DCE-to-DTE) Table 112. <DLE> Simple Events (DCE-to-DTE) (Continued) Table 113. <DLE> Complex Event Reports (DCE-to-DTE) Table 114. Voice Mode U Registers Page Page Page Page Tabl e 115 . Table 116. 7.2. Voice ReferenceOverview Page Page Table 117. Voice Mode Operations (+FCLASS=8) Table 118. +FCLASS and IDLE State Transitions Expected Response Table 117. Voice Mode Operations (+FCLASS=8) (Continued) 7.3. Si3000 Configuration Figure 31. System Voice Modes Speakerphone Handset Hands-Free Handset 7.4. Initialization Table 119. Initialization Sequence Table 119. Initialization Sequence (Continued) 7.5. Handset Table 119. Initialization Sequence (Continued) Table 120. Table 121. Handset Automatic Tone Dial Table 122. Handset Manual Off-Hook Dial Table 123. Handset Automatic Pulse Dial Table 124. Handset to TAM Hands-Free Transition Table 125. Handset to Speakerphone Transition 7.6. Telephone Answering Machine Table 126. Local Ring Notification with Type I CID Event Table 127. TAM Hands-Free Record OGM Table 128. TAM Hands-Free Review OGM Table 129. TAM Handset Record OGM Table 129. TAM Handset Record OGM (Continued) Table 130. TAM Handset Review OGM Table 129. TAM Handset Record OGM (Continued) Table 130. TAM Handset Review OGM (Continued) Table 131. TAM PSTN Normal Answer OGM Playback with ICM Record Table 131. TAM PSTN Normal Answer OGM Playback with ICM Record (Continued) Table 132. TAM PSTN Interrupted Answer OGM Playback with DTMF Menu Entry Table 131. TAM PSTN Normal Answer OGM Playback with ICM Record (Continued) Table 132. TAM PSTN Interrupted Answer OGM Playback with DTMF Menu Entry (Continued) 7.7. Speakerphone Table 132. TAM PSTN Interrupted Answer OGM Playback with DTMF Menu Entry (Continued) Figure 32. Transmit Gain Reference Measurements Table 133. Simplex Speakerphone U Registers Page Table 134. Transmit/Receive Gain Calibration Dial Remote Telephone Figure 34. Receive Gain Reference Measurements Figure 35. Receive Gain Configuration Figure 36. AEC Gain Calibration Table 135. AEC Gain Calibration Dial Remote Telephone Table 136. Speakerphone Configuration Table 136. Speakerphone Configuration (Continued) Table 137. Simplex Speakerphone Configuration Table 138. Speakerphone Automatic Tone Dial Table 139. Speakerphone Manual Off-Hook Dial Table 140. Speakerphone Automatic Pulse Dial Table 141. Speakerphone to Handset Transition 7.8. Glossary Table 141. Speakerphone to Handset Transition (Continued) 7.9. References 8. Security Protocols 8.1. Implementing the SIA Protocol Page Page Table 143. Definitions of Result Codes Typically Expected in an SIA Session 8.2. Implementing the Ademco Contact ID Protocol Table 144. Ademco Contact ID Protocol Tone Transmission AT Commands Table 145. Ademco Mode of Operation Page Page Page 9. Chinese ePOS SMS 9.2. SMS AT Command Set Table 146. AT Commands for SMS Table 147. User Registers for SMS Operations Page Page 9.3. Example Session Figure 38. Diagram of Handshake (Using CAS/CAS ACK) and Message Packet Exchange Figure 39. SMS Process in Host and Modem O A 1 2 10. Testing and Diagnostics 10.1. Prototype Bring-Up (Si3018/10) Page Page Figure 40. Test the Host Interface Figure 41. Test the Prototype Modem Figure 42. Test the Prototype Si3018/10 Circuitry Figure 43. Verify Prototype Si3018/10 Failure Figure 44. Si3018/10 Typical Voltages Table 148. Resistance to Si3018/10 Pin 15 On-Hook Off-Hook Voltages measured with respect to IGND (Si3018 pin 15) Table 149. Resistance across Components Table 150. Voltages across Components with Diode Checker Page 10.3. Board Test Figure 46. Bell 103V.34 Modem Functional Test Connection Teltone TLS 3 Modem Under Test Reference Modem Test Computer Figure 47. V.90 Modem Functional Test Connection Table 151. Test Coverage Teltone ILS 2000 ISDN Modem Modem Under Test 10.4. Compliance Testing Table 152. AT Commands for Compliance Testing Table 153. Symbol/Data Rate Table 154. V.29 Data Rate 1000 @ 100 MHz, 200 mA Page 10.6. Debugging the DTE interface APPENDIX AEPOS APPLICATIONS VISA II (7E1) ENQ (0x05) STX <data>ETX, LRC ACK (0x06) Terminal ACK (0x06) Host Dials host Disconnects EOT (0x04) Recommendation V.80 Page Figure 51. ISOmodem V.80 Protocol HDLC Framing in Framed Sub-Mode The ISOmodem in EPOS Applications V.80 Handler Isomodem with V.80 UART A V.29 FastPOS Sample Program Introduction Example Program in C/C++ Page Page Page Page Page Page Page Page V.29 FastPOS Detailed Wave Files RTS (not RTS) signal V.29 FastPOS DTE Trace This is recorded while the program listed above is running. The patch load is left out for brevity. APPENDIX BLINE AUDIO RECORDING When to Use Audio Recording Times When Audio Recording May Not Help Hardware Setup Setting PC Microphone Input for Recording (Windows NT) Page Figure 54. Multimedia Properties Setting PC Microphone Input for Recording (Windows XP) Page Making the Recording with Windows Sound Recorder (Windows XP, NT or Windows 98) Figure 56. Sound Recorder Figure 57. Adobe Audition Example Making the Recording with Adobe Audition or WaveSurfer Audio Playback and Analysis Figure 58. Adobe Audition Temporal View of a Good V.22 Transaction Figure 59. Adobe Audition Spectral View of a Good V.22 Transaction Page Audio-Recording Pitfalls Figure 62. Recording Made at Excessive Level Figure 63. Recording Made with AGC Noise Reduction Details of Some Low-Speed Protocols Figure 65. Appearance of V.22 Protocol Figure 64. Appearance of Bell 212 Protocol Answering modems Scambled Binary Figure 66. Appearance of V.22 bis Protocol Figure 67. Appearance of V.22 Fast Connect Protocols Figure 68. Appearance of V.29 FastPOS Protocol Figure 69. Examples of EPOS Server Misbehavior Page Examples of Line Impairments DTMF Distorted by Low Line Level Power Line Related Noise Figure 73. Odd Harmonics of 50 Hz Manifest as Horizontal Lines Spaced at 100 Hz APPENDIX CPARALLEL/SPI INTERFACE SOFTWARE IMPLEMENTATION Page Software Description Hardware Access Layer Interrupt Service and Polling Layer Page Page Page Buffer Management, Status and Control Layer Page The Application Layer: Sample Application Compiler Option: Dot Commands Modem Operation Initialization Making a Connection Data Bursts Modem Interrupt Service Sample Code Page Page DOCUMENT CHANGE LIST Revision 0.5 to Revision 0.6 Revision 0.6 to Revision 0.7 Revision 0.7 to Revision 0.8 Revision 0.8 to Revision 0.9 CONTACT INFORMATION