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