Conexant RC336D User manual

Doc. No. 1154, Rev. 3
January 22, 1999
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RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
ii Conexant 1154
Information provided by Conexant Systems, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Conexant
for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent rights of Conexant other than for circuitry embodied in Conexant products. Conexant reserves the right to change
circuitry at any time without notice. This document is subject to change without notice.
K56flex is a trademark of Conexant Systems, Inc. and Lucent Technologies.
Conexant, “What's Next in Communications Technologies”, MNP 10EC, and ConfigurACE are trademarks of Conexant Systems, Inc.
Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of
their respective companies. All other marks mentioned herein are the property of their respective owners.
©1999, Conexant Systems, Inc.
Printed in U.S.A.
All Rights Reserved.

RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
1154 Conexant iii
Table of Contents
1. INTRODUCTION................................................................................................................................................. 1-1
1.1 SUMMARY............................................................................................................................................... 1-1
1.2 FEATURES.............................................................................................................................................. 1-3
1.3 TECHNICAL OVERVIEW......................................................................................................................... 1-4
1.3.1 General Description ................................................................................................................... 1-4
Data/Fax Modes..................................................................................................................1-4
Synchronous Access Mode (SAM)..................................................................................... 1-4
World Class Operation........................................................................................................ 1-4
Voice/TAM Mode ................................................................................................................ 1-6
Telephony Extension Operation.......................................................................................... 1-6
Speakerphone Mode (SP and SVD Models)....................................................................... 1-6
AudioSpan Mode (SP and SVD Models)............................................................................ 1-6
DSVD Mode using RCDSVD SCP Device (SVD Models)................................................... 1-6
Host-Based DSVD.............................................................................................................. 1-7
Sleep Mode......................................................................................................................... 1-7
1.3.2 Devices...................................................................................................................................... 1-7
Modem Data Pump (MDP).................................................................................................. 1-7
Microcontroller (MCU)......................................................................................................... 1-7
RCDSVD Speech Codec Processor (SCP) (Optional)........................................................ 1-7
Plug and Play (PnP) ISA Bus Interface Device (PNP Models) ........................................... 1-8
1.3.3 MCU Firmware........................................................................................................................... 1-8
1.3.4 Supported Interfaces.................................................................................................................. 1-8
Serial DTE Interface and Indicator Outputs........................................................................ 1-8
Parallel Host Bus Interface ................................................................................................. 1-8
NVRAM (Serial EEPROM) Interface................................................................................... 1-8
External Bus Interface......................................................................................................... 1-9
Telephone Line/Telephone Interface.................................................................................. 1-9
Speakerphone Interface (SP and SVD Models) ................................................................. 1-9
RCDSVD SCP Interface (SVD Models).............................................................................. 1-9
1.3.5 Commands............................................................................................................................... 1-13
1.3.6 ConfigurACE II for Windows Utility Program............................................................................ 1-13
2. TECHNICAL SPECIFICATIONS ........................................................................................................................ 2-1
2.1 SERIAL DTE INTERFACE OPERATION................................................................................................. 2-1
2.1.1 Automatic Speed/Format Sensing .............................................................................................2-1
2.2 PARALLEL HOST BUS INTERFACE OPERATION................................................................................. 2-1
2.3 ESTABLISHING DATA MODEM CONNECTIONS................................................................................... 2-1
Telephone Number Directory.............................................................................................. 2-1
Dialing................................................................................................................................. 2-1
Modem Handshaking Protocol............................................................................................ 2-1
Call Progress Tone Detection............................................................................................. 2-2
Answer Tone Detection....................................................................................................... 2-2
Ring Detection .................................................................................................................... 2-2
Billing Protection................................................................................................................. 2-2
Connection Speeds............................................................................................................. 2-2
Automode............................................................................................................................ 2-2
2.4 DATA MODE............................................................................................................................................ 2-3
Speed Buffering (Normal Mode)......................................................................................... 2-3
Flow Control........................................................................................................................ 2-3
Escape Sequence Detection............................................................................................... 2-3
BREAK Detection................................................................................................................ 2-3
Telephone Line Monitoring ................................................................................................. 2-3
Send SPACE on Disconnect (V.22 bis and Below) ............................................................ 2-3
Fall Forward/Fallback (V.34/V.32 bis/V.32) ........................................................................ 2-3
Retrain ................................................................................................................................ 2-3

RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
iv Conexant 1154
Programmable Inactivity Timer........................................................................................... 2-3
DTE Signal Monitoring (Serial DTE Interface Only)............................................................ 2-4
2.5 ERROR CORRECTION AND DATA COMPRESSION............................................................................. 2-4
V.42 Error Correction.......................................................................................................... 2-4
MNP 2-4 Error Correction................................................................................................... 2-4
V.42 bis Data Compression................................................................................................ 2-4
MNP 5 Data Compression.................................................................................................. 2-4
2.6 MNP 10 DATA THROUGHPUT ENHANCEMENT................................................................................... 2-4
2.7 MNP 10EC™ ENHANCED CELLULAR CONNECTION .......................................................................... 2-4
2.8 FAX CLASS 1 AND FAX CLASS 2 OPERATION .................................................................................... 2-5
2.9 VOICE/AUDIO MODE.............................................................................................................................. 2-5
2.9.1 Online Voice Command Mode................................................................................................... 2-5
2.9.2 Voice Receive Mode.................................................................................................................. 2-5
2.9.3 Voice Transmit Mode................................................................................................................. 2-5
2.9.4 Audio Mode................................................................................................................................ 2-5
2.9.5 Tone Detectors .......................................................................................................................... 2-5
2.9.6 Speakerphone Modes................................................................................................................ 2-5
2.9.7 Sound Card Support Modes....................................................................................................... 2-6
2.10 SIMULTANEOUS AUDIO/VOICE AND DATA (AUDIOSPAN) ................................................................. 2-6
2.10.1 AudioSpan Mode Selection........................................................................................................ 2-6
2.10.2 AudioSpan Audio Interface ........................................................................................................ 2-6
2.10.3 Audio Quality Considerations..................................................................................................... 2-6
2.11 ON-BOARD DSVD MODE........................................................................................................................ 2-6
2.11.1 DSVD Handset Mode................................................................................................................. 2-6
2.11.2 DSVD Headset Mode................................................................................................................. 2-6
2.11.3 DSVD Half-Duplex Speakerphone (HDSP) Mode...................................................................... 2-6
2.12 HOST-BASED DSVD MODE.................................................................................................................... 2-7
2.13 FULL-DUPLEX SPEAKERPHONE (FDSP) MODE.................................................................................. 2-7
2.14 CALLER ID............................................................................................................................................... 2-7
2.15 WORLD CLASS COUNTRY SUPPORT .................................................................................................. 2-7
2.15.1 Dialing........................................................................................................................................ 2-7
2.15.2 Carrier Transmit Level................................................................................................................ 2-7
2.15.3 Calling Tone............................................................................................................................... 2-7
2.15.4 Call Progress Tone Detection.................................................................................................... 2-7
2.15.5 Answer Tone Detection.............................................................................................................. 2-8
2.15.6 Blacklist Parameters .................................................................................................................. 2-8
2.15.7 Relay Control ............................................................................................................................. 2-8
2.16 DIAGNOSTICS......................................................................................................................................... 2-8
2.16.1 Commanded Tests..................................................................................................................... 2-8
2.16.2 Power On Reset Tests............................................................................................................... 2-8
2.17 LOW POWER SLEEP MODE................................................................................................................... 2-8
3. HARDWARE INTERFACE ................................................................................................................................. 3-1
3.1 HARDWARE SIGNALS............................................................................................................................ 3-1
3.2 INTERFACE TIMING AND WAVEFORMS............................................................................................. 3-23
3.2.1 External Memory Bus Timing................................................................................................... 3-23
3.2.2 Parallel Host Bus Timing.......................................................................................................... 3-25
3.2.3 Serial DTE Interface................................................................................................................. 3-27
4. PARALLEL HOST INTERFACE......................................................................................................................... 4-1
4.1 OVERVIEW.............................................................................................................................................. 4-1
4.2 REGISTER SIGNAL DEFINITIONS ......................................................................................................... 4-3
4.2.1 IER - Interrupt Enable Register (Addr = 1, DLAB = 0) ............................................................... 4-3
4.2.2 FCR - FIFO Control Register (Addr = 2, Write Only).................................................................. 4-4
4.2.3 IIR - Interrupt Identifier Register (Addr = 2)................................................................................ 4-5
4.2.4 LCR - Line Control Register (Addr = 3)...................................................................................... 4-6
4.2.5 MCR - Modem Control Register (Addr = 4)................................................................................ 4-7
4.2.6 LSR - Line Status Register (Addr = 5) ....................................................................................... 4-8
4.2.7 MSR - Modem Status Register (Addr = 6) ................................................................................. 4-9
4.2.8 RBR - RX Buffer (Receiver Buffer Register) (Addr = 0, DLAB = 0)............................................ 4-9

RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
1154 Conexant v
4.2.9 THR - TX Buffer (Transmitter Holding Register) (Addr = 0, DLAB = 0)...................................... 4-9
4.2.10 Divisor Registers (Addr = 0 and 1, DLAB = 1) ........................................................................... 4-9
4.2.11 SCR - Scratch Register (Addr = 7)............................................................................................. 4-9
4.3 RECEIVER FIFO INTERRUPT OPERATION......................................................................................... 4-10
4.3.1 Receiver Data Available Interrupt............................................................................................ 4-10
4.3.2 Receiver Character Timeout Interrupts.................................................................................... 4-10
4.4 TRANSMITTER FIFO INTERRUPT OPERATION ................................................................................. 4-10
4.4.1 Transmitter Empty Interrupt ..................................................................................................... 4-10
5. DESIGN CONSIDERATIONS............................................................................................................................. 5-1
5.1 PC BOARD LAYOUT GUIDELINES......................................................................................................... 5-1
5.1.1 General Principles...................................................................................................................... 5-1
5.1.2 Component Placement............................................................................................................... 5-1
5.1.3 Signal Routing............................................................................................................................ 5-2
5.1.4 Board Power Traces .................................................................................................................. 5-3
5.1.5 MCU Power................................................................................................................................ 5-3
5.1.6 MDP Power and Ground............................................................................................................ 5-3
5.1.7 Ground Planes........................................................................................................................... 5-3
5.1.8 Crystal Circuit............................................................................................................................. 5-4
5.1.9 Standalone Modem Design with EIA/TIA-232 Interface............................................................. 5-4
5.1.10 VC and VREF Circuit ................................................................................................................. 5-4
5.1.11 Telephone and Local Handset Interface.................................................................................... 5-5
5.1.12 Optional Configurations ............................................................................................................. 5-5
5.1.13 MDP Specific.............................................................................................................................. 5-5
5.2 DAA TRANSFORMER CONSIDERATION............................................................................................... 5-5
5.3 CRYSTAL/OSCILLATOR SPECIFICATIONS .......................................................................................... 5-7
5.4 SCHEMATICS........................................................................................................................................ 5-11
6. PACKAGE DIMENSIONS................................................................................................................................... 6-1

RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
vi Conexant 1154
List of Figures
Figure 1-1. Block Diagram - Serial DTE Interface.................................................................................................................... 1-5
Figure 1-2. Block Diagram - Parallel Host Interface................................................................................................................. 1-5
Figure 1-3. 1-Relay Data/Fax/TAM DAA Interface (U.S.)....................................................................................................... 1-10
Figure 1-4. 2-Relay Data/Fax/TAM/V.61/Speakerphone DAA Interface (U.S.)...................................................................... 1-11
Figure 3-1. Hardware Interface Signals - Serial DTE Interface................................................................................................ 3-2
Figure 3-2. Hardware Interface Signals - Parallel Host Interface............................................................................................. 3-3
Figure 3-3. MCU Pin Signals - Serial DTE Interface - 80-Pin PQFP........................................................................................ 3-4
Figure 3-4. MCU Pin Signals - Parallel Host Interface - 80-Pin PQFP..................................................................................... 3-4
Figure 3-5. MDP Pin Signals - 100-Pin PQFP.......................................................................................................................... 3-7
Figure 3-6. RCDSVD SCP Pin Signals- 100-Pin PQFP ........................................................................................................... 3-9
Figure 3-7. Waveforms - External Memory Bus ..................................................................................................................... 3-24
Figure 3-8. Waveforms - Parallel Host Bus............................................................................................................................ 3-26
Figure 3-9. Waveforms - Serial DTE Interface ....................................................................................................................... 3-27
Figure 5-1. Interface Schematic - MCU with Serial DTE Interface - 80-Pin PQFP................................................................. 5-12
Figure 5-2. Interface Schematic - MCU with Parallel Host Interface - 80-Pin PQFP.............................................................. 5-13
Figure 5-3. Interface Schematic - MDP - 100-Pin PQFP........................................................................................................ 5-14
Figure 5-4. Interface Schematic - RCDSVD SCP - 100-Pin PQFP ........................................................................................ 5-15
Figure 6-1. Package Dimensions - 80-Pin PQFP..................................................................................................................... 6-1
Figure 6-2. Package Dimensions - 100-Pin PQFP................................................................................................................... 6-2

RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
1154 Conexant vii
List of Tables
Table 1-1. Modem Models and Functions................................................................................................................................ 1-2
Table 1-2. Modem Memory Options......................................................................................................................................... 1-9
Table 1-3. +VLS Command Options....................................................................................................................................... 1-12
Table 2-1. +MS Command Automode Connectivity ................................................................................................................. 2-2
Table 3-1. MCU Pin Signals - Serial DTE Interface - 80-Pin PQFP ......................................................................................... 3-5
Table 3-2. MCU Pin Signals- Parallel Host Interface - 80-Pin PQFP....................................................................................... 3-6
Table 3-3. MDP Pin Signals - 100-Pin PQFP........................................................................................................................... 3-8
Table 3-4. RCDSVD SCP Pin Signals - 100-Pin PQFP.......................................................................................................... 3-10
Table 3-5. MCU Pin Signal Definitions................................................................................................................................... 3-11
Table 3-6. MDP Pin Signal Definitions ................................................................................................................................... 3-14
Table 3-7. RCDSVD SCP Pin Signal Definitions.................................................................................................................... 3-17
Table 3-8. MCU Digital Electrical Characteristics................................................................................................................... 3-19
Table 3-9. MDP Digital Electrical Characteristics................................................................................................................... 3-20
Table 3-10. Analog Electrical Characteristics......................................................................................................................... 3-21
Table 3-11. Current and Power Requirements....................................................................................................................... 3-22
Table 3-12. Absolute Maximum Ratings................................................................................................................................. 3-22
Table 3-13. Timing - External Memory Bus............................................................................................................................ 3-23
Table 3-14. Timing - Parallel Host Bus................................................................................................................................... 3-25
Table 4-1. Parallel Interface Registers..................................................................................................................................... 4-2
Table 4-2. Interrupt Sources and Reset Control....................................................................................................................... 4-5
Table 4-3. Programmable Baud Rates................................................................................................................................... 4-10
Table 5-4. MCU, MDP and SCP Pin Noise Characteristics...................................................................................................... 5-6
Table 5-5. Crystal Specifications - Surface Mount ................................................................................................................... 5-7
Table 5-6. Crystal Specifications - Through Hole..................................................................................................................... 5-8
Table 5-7. Clock Oscillator Specifications - Surface Mount...................................................................................................... 5-9
Table 5-8. Clock Oscillator Specifications - Through Hole..................................................................................................... 5-10

RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
viii Conexant 1154
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RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
1154 Conexant 1-1
1. INTRODUCTION
1.1 SUMMARY
The ConexantRC56D, RC336D, and RC144D Modem Device Set families support data/fax, voice/TAM/telephony
extensions, V.80 synchronous access mode, host-DSVD, and optional speakerphone, AudioSpan, and on-board DSVD
functions depending upon model (Table 1-1).
The modem supports the following primary data modulations: ITU-T V.90/K56flex(RC56), V.34 (RC56 and RC336) and
V.32bis. Otherwise, the modems are identical within like models, e.g., SP models operate the same. Unless otherwise noted,
descriptions in this document apply to all modem families and models.
The modem is designed to operate with dial-up telephone lines in the U.S. and world-wide.
Low profile, small PQFP packages make this device set ideal for desktop applications using parallel host or serial DTE
interface.
The device set consists of an 8-bit microcontroller (MCU) in an 80-pin PQFP, a modem data pump (MDP) in a 100-pin PQFP,
and an optional Plug and Play (PnP) ISA Bus Interface Device in 80-pin PQFP. The SVD model is the same as the SP model
with the addition of an RCDSVD Speech Codec Processor (SCP) in a 100-pin PQFP to support DSVD.
Downloadable architecture supports downloading of modem firmware from the host/DTE to the MCU and, transparently to the
host/DTE, the downloading of MDP code modules from the MCU.
The modem operates by executing firmware from installed 1Mbit (128k x 8) RAM and 2Mbit (256k x 8) ROM/flash ROM. The
RC336 and RC144 can alternatively use 32k x 8 RAM and 1Mbit or 2Mbit ROM/flash ROM.
In V.90/K56flex mode (RC56), the modem can receive data at speeds up to 56 kbps from a digitally connected V.90- or
K56flex-compatible central site modem. Taking advantage of the PSTN which is primarily digital except for the client modem
to central office local loop, V.90/K56flex modems are ideal for applications such as remote access to an Internet Service
Provider (ISP), on-line service, or corporate site. The modem can send data at speeds up to V.34 rates.
In V.34 data mode (RC56 and RC336), the modem operates at line speeds up to 33.6 kbps. Error correction (V.42/MNP 2-4)
and data compression (V.42 bis/MNP 5) maximize data transfer integrity and boost average data throughput up to
230.4 kbps. Non-error-correcting mode is also supported.
In V.32 bis mode, the modem operates at line speeds up to 14.4 kbps.
The modem supports fax Group 3 send and receive rates up to 33.6 kbps and T.30 protocol.
In voice/TAM mode, enhanced 2-bit or 4-bit per sample ADPCM coding and decoding at 7200 Hz sample rate allows efficient
digital storage of voice/audio. This mode supports applications such as digital telephone answering machine (TAM), voice
annotation, and recording from and playback to the telephone line. Other voice/TAM functions using handset or headset are
supported by SP and SVD models. Extension pickup /remote hangup detection and line-in-use detection telephony
extensions are also supported.
SP and SVD models support position independent, full-duplex speakerphone (FDSP) operation using microphone and
speaker, as well as other voice/TAM applications using handset or headset.
SP and SVD models also support AudioSpan (analog simultaneous audio/voice and data) operation with a data rate of 4.8
kbps with audio.
SVD models, using the optional RCDSVD SCP device (see RCDSVD SCP Designer’s Guide, Order No. 1087), support
hardware-based (on-board) V.70 DSVD (digital simultaneous voice and data) with speech coding per ITU-T interoperable
G.729 and G.729 Annex A with interoperable G.729 Annex B.
Host-based DSVD is supported in all models, however, the host PC must supply full-duplex sound support, typically to a
microphone/speaker, such as provided by Conexant WaveArtist devices or a sound card.
A common PC board design can support data/fax, V.80, voice/TAM/telephony extensions, speakerphone, AudioSpan, and
host- or on-board DSVD operation depending on the installed modem and optional PnP and RCDSVD devices.
Accelerator kits and reference designs are available to minimize application design time and costs. PC-based
“ConfigurACE™ II for Windows” software allows MCU firmware to be customized.
This designer's guide describes the modem system capabilities and hardware interfaces. Supporting AT commands and S
Registers are identified in firmware release notes and defined in the AT Command Reference Manual (Order No. 1131 or
1199 depending on installed firmware).

RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide
1-2 Conexant 1154
Table 1-1. Modem Models and Functions
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