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DS56-L145-061

SmartSCM Modem

Conexant Systems 

SmartSCM Modem Data Sheet

TAM Mode

TAM Mode features include 8-bit linear coding at 8 kHz sample rate. Tone detection/generation, call discrimination, and

concurrent DTMF detection are also supported. ADPCM (4-bit IMA) coding is also supported to meet Microsoft WHQL logo

requirements.

TAM Mode is supported by three submodes:

1. Online Voice Command Mode supports connection to the telephone line or, for S models, a

microphone/speaker/handset/headset.

2. Voice Receive Mode supports recording voice or audio data input from the telephone line or, for S models, a

microphone/handset/headset.

3. Voice Transmit Mode supports playback of voice or audio data to the telephone line or, for S models, a

speaker/handset/headset.

Voice/Speakerphone Mode (S Models)

S models include additional telephone handset, external microphone, and external speaker interfaces which support voice

and full-duplex speakerphone (FDSP) operation.

Hands-free full-duplex telephone operation is supported in Speakerphone Mode under host control. Speakerphone Mode

features an advanced proprietary speakerphone algorithm which supports full-duplex voice conversation with acoustic, line,

and handset echo cancellation. Parameters are constantly adjusted to maintain stability with automatic fallback from full-

duplex to pseudo-duplex operation. The speakerphone algorithm allows position independent placement of microphone and

speaker. The host can separately control volume, muting, and AGC in microphone and speaker channels.

1.3.4 Reference Design

A data/fax/TAM/speakerphone reference design for an external modem (RD00-D970) is available to minimize application

design time, reduce development cost, and accelerate market entry.

A design package is available in electronic form. This package includes schematics, bill of materials (BOM), vendor part list

(VPL), board layout files in Gerber format, and complete documentation.

1.3.5 GSM (Parallel Host Interface)

Supported GSM features include:

• Data modem

− V.21, V.23, V.22, V.22 bis, V.32

− ISDN interoperability: 300 bps to 9600 bps

• Transparent asynchronous mode up to 9600 bps

• Non-transparent mode (RLP) up to 9600 bps

• Fax modem send and receive rate up to 9600 bps

• AT GSM commands (ETSI 07.07)

• GSM direct connect

• Firmware interface for OEM-provided phone driver

• Automatic GSM cable presence detection

• Built-in parallel host (16550A UART) interface

GSM operation requires an external 1 Mbit (128k x 8) ROM/flash ROM. If optional external ROM/flash ROM is used for the

base modem code, GSM operation requires 1 Mbit of an the external 4 Mbits (512k x 8) ROM/flash ROM.

1.4 Hardware Description

SmartDAA technology (patent pending) eliminates the need for a costly analog transformer, relays, and opto-isolators that

are typically used in discrete DAA implementations. The programmable SmartDAA architecture simplifies product

implementation in worldwide markets by eliminating the need for country-specific components.

1.4.1 CX88168 Single Chip Modem

The CX88168 Single Chip Modem (SCM), packaged in a 128-pin TQFP, includes a Microcontroller (MCU), a Modem Data

Pump (MDP), 256k bytes internal ROM, 32k bytes internal RAM, and SmartDAA interface functions.

The SCM connects to host via a parallel host (PARIF = high) or a logical V.24 (EIA/TIA-232-E) serial DTE interface (PARIF =

low).

100490C

Conexant

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