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DS96-L853-051

SmartSCM Modem

Conexant Systems 

SmartSCM Modem Data Sheet

1 INTRODUCTION

1.1 Overview

The Conexant SmartSCM V.90/K56flex Modem Device Set with SmartDAA technology supports analog data up to 56

kbps, analog fax to 14.4 kbps, telephone answering machine (TAM)/telephony extensions, voice/speakerphone (optional),

GSM, analog cellular (optional), and parallel/serial host interface operation depending on model. Table 1-1 lists the available

models.

The modem operates with PSTN telephone lines worldwide and supports optional direct connect to an AMPS analog cellular

phone. The parallel host interface model also supports direct connect to a GSM phone.

Conexant's SmartDAA technology (patent pending) eliminates the need for a costly analog transformer, relays, and opto-

isolators typically used in discrete DAA (Data Access Arrangement) implementations The SmartDAA architecture also

simplifies product implementation by eliminating the need for country-specific board configurations enabling worldwide

homologation of a single modem board design and a single bill of materials (BOM).

The SmartDAA system-powered DAA operates reliably without drawing power from the line, unlike line-powered DAAs which

operate poorly when line current is insufficient due to long lines or poor line conditions. Enhanced features, such as

monitoring of local extension status without going off-hook, are also supported.

Incorporating Conexant’s proprietary Digital Isolation Barrier (DIB) design (patent pending) and other innovative DAA

features, the SmartDAA architecture simplifies application design, minimizes layout area, and reduces component cost.

The SmartSCM device set, consisting of a CX88168 Single Chip Modem (SCM) in a 128-pin TQFP and a CX20463

SmartDAA™ Line Side Device (LSD) in a 32-pin TQFP, supports data/fax/TAM operation with hardware-based modem

controller, digital signal processing, and DAA/telephone line interface functions (Figure 1-1 and Figure 1-2).

The SCM device integrates modem controller (MCU), modem data pump (MDP), 256k bytes ROM, 32k bytes RAM, and

SmartDAA system side device (SSD) functions onto a single die.

Modem functions for both parallel and serial interface configurations operate using only internal memory with the exception of

GSM which requires external memory. The external memory interface can also be used for customized modem code and

added/modified country profiles.

Low profile, small TQFP packages and low voltage operation with low power consumption make this device set ideal for

embedded and palmtop applications using parallel host or serial DTE interface.

The modem operates by executing firmware from internal ROM and RAM. Customized modem firmware can be executed

from optional external memory, either from ROM/flash ROM or from serial EEPROM and RAM. GSM operation requires an

external 1 Mbit (128k x 8) ROM/flash ROM.

In V.90/K56flex data mode (/56 models), the modem can receive data at line speeds up to 56 kbps from a digitally connected

V.90 or K56flex-compatible central site modem. In this mode, the modem can transmit data at line speeds up to V.34 rates.

In V.34 data mode (/56 and /33 models), the modem operates at line speeds up to 33.6 kbps. When applicable, error

correction (V.42/MNP 2-4) and data compression (V.42 bis/MNP 5) maximize data transfer integrity and boost average data

throughput. Non-error-correcting mode is also supported.

In V.32 bis data mode, the modem operates at lines speeds up to 14.4 kbps.

In V.22 bis fast connect mode, the modem can connect at 2400 bps with a very short training time, which is very efficient for

small data transfers.

Fax Group 3 send and receive rates are supported up to 14.4 kbps with T.30 protocol.

V.80 synchronous access mode supports host-controlled communication protocols, e. g., H.324 video conferencing.

In TAM mode, enhanced 2-bit or 4-bit per sample coding schemes at 8 kHz sample rate provide flexible format compatibility

and allows efficient digital storage of voice/audio. Also supported are 8-bit linear and IMA 4-bit ADPCM coding. This mode

supports applications such as digital telephone answering machine (TAM), voice annotation, and recording from and playback

to the telephone line.

S models, using the optional CX20437 Voice Codec (VC) in a 32-pin TQFP, support position independent, full-duplex

speakerphone (FDSP) operation using microphone and speaker, as well as other voice/TAM applications using handset or

headset. S models can also support analog cellular operation with direct connection to an analog cellular phone (in lieu of a

telephone handset/headset connection).

100490C

Conexant

1-1

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