Introduction

Overview

The Conexant? SmartV.XX Modem is a full-featured, worldwide, controller-based modem that integrates modem controller (MCU), modem data pump (MDP), 256 KB ROM, 32 KB RAM, and SmartDAA system side device (SSD) functions onto a single die.

The modem operates by executing firmware from internal ROM and RAM. Optional customized firmware is supported with optional external flash ROM memory. Additionally, added/modified country profiles are supported by internal SRAM patch (maximum of one profile) or serial EEPROM. Downloadable architecture supports downloading of customized MCU firmware from the host/DTE to the SmartV.XX modem.

Features

General Modem Features

? Data modem

? Quick connect, Modem-on-Hold, and PCM upstream functions (V.92 models)

? ITU-T V.92/V.90 (V.92 models), V.34 (V.92 and V.34 models), V.32bis, V.32, V.29, FastPOS (V.29), V.22 bis, V.22, V.22 Fast Connect, V.23, V.21, Bell 212A, and Bell 103

? V.250 and V.251 commands

? Data compression and error correction

? V.44 data compression

? V.42 bis and MNP 5 data compression

? V.42 LAPM and MNP 2-4 error correction

? Fax modem send and receive rates up to 14.4 kbps

? V.17, V.29, V.27 ter, and V.21 channel 2

? EIA/TIA 578 Class 1 and T.31 Class 1.0

? V.80 synchronous access mode supports host-controlled communication protocols with H.324 interface support

? Interfaces to optional external ROM/flash ROM, RAM, and/or optional serial EEPROM

? Data/Fax/Voice call discrimination

? Hardware-based modem controller

? Hardware-based digital signal processor (DSP)

? Worldwide operation

? Complies to TBR21 and other country requirements

? On-hook and/or off-hook Caller ID detection for selected countries

? Call progress, blacklisting

? Internal ROM includes default values for 29 countries

? Additional and modified country profile can be stored in internal SRAM

? Caller waiting detection

? Caller ID detect

? On-hook Caller ID detection

? Off-hook Call Waiting Caller ID detection during data mode in V.92, V.90, V.34, V.32bis, and V.32

? Distinctive ring detect

? Modem customization available through patch code that can be stored in optional serial EEPROM or internal SRAM

? Telephony/TAM

? V.253 commands

? 2-bit and 4-bit Conexant ADPCM, 8-bit linear PCM, and 4-bit IMA coding

? 8 kHz sample rate

? Concurrent DTMF, ring, and Caller ID detection

? Full-duplex speakerphone (FDSP) mode using optional CX20442 Voice Codec (S models)

? Microphone and speaker interface

? Telephone handset or headset interface

? Acoustic and line echo cancellation

? Microphone gain and muting

? Speaker volume control and muting

? Built-in host/DTE interface

? Parallel 16550A UART-compatible interface up to 230.4 kbps

? Serial ITU-T V.24 (EIA/TIA-232-E) logical interface up to 115.2 kbps

? Downloadable architecture

? Direct mode (serial DTE interface)

? Flow control and speed buffering

? Automatic format/speed sensing

? Serial async/sync data; parallel async data

? Thin packages support low profile designs (1.6 mm max. height)

? CX81801 Modem device in 128-pin TQFP

? CX20493 LSD in 28-pin QFN

? CX20442 VC in 32-pin TQFP

? +3.3V operation with +5V tolerant digital inputs

? Typical power use

? CX81801 and CX20493: 209 mW (Normal Mode); 59 mW (Sleep Mode)

? CX20442: 5 mW (Normal Mode)

SmartDAA Features

? System side powered DAA operates under poor line current supply conditions

? Modem Wake-on-Ring

? Ring detection

? Line current loss detection

? Pulse dialing

? Line-in-use detection during on-hook operation

? Remote hang-up detection for efficient call termination

? Extension pickup detection

? Digital PBX line protection

? Meets worldwide DC Voltage/Current (VI) masks requirements

Applications

? Set top boxes

? Gaming devices

? Point of sale terminals

? Remote monitoring and data collections systems

? Handheld computers

? Other embedded systems