SmartACFL

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V.90/K56flex Modem Device Sets with SmartDAA Technology for Low Power Applications

8

Conexant

Doc. No. 100444A

Proprietary Information

RCDSVD Speech Codec Processor (SCP)

(Optional)

The RCDSVD SCP (R6715-14), required for on-

board DSVD operation, is packaged in a 100-pin

PQFP. The 56.448 MHz crystal frequency is

supplied by the MDP XCLK output.

MCU/MCUP Firmware

MCU/MCUP firmware performs processing of

general modem control, command sets, data

modem, error correction and data compression

(ECC), fax class 1, fax class 2, DSVD,

voice/audio/TAM/speakerphone, W-class, V.80,

analog cellular, GSM, and serial DTE/parallel

host/PC Card interface functions according to

modem models (Table 1).

Configurations of the modem firmware are provided

to support parallel host bus interface (MCU), serial

DTE interface (MCU) or PC Card interface (MCUP)

operation.

The modem firmware is provided in object code form

for the OEM to program into external ROM/flash

ROM. The modem firmware may also be provided in

source code form under a source code addendum

license agreement.

Modem Data Pump (MDP)

The Modem Data Pump (MDP) supports data/fax

modem, voice record from and playback to the

telephone line, and optional voice/full-duplex

speakerphone operation. The MDP communicates

with the MCU via parallel bus, serial data and clock,

and serial voice (optional) signals. Downloadable

architecture allows upgrading of MDP code from the

MCU.

The MDP, packaged in a 100-pin TQFP, includes a

modem controller interface, a digital signal processor

(DSP), a voice codec (VC) interface, and a

SmartDAA Interface.

The MDP performs telephone line signal

modulation/demodulation in a hardware DSP which

reduces computational load on the host processor.

Downloadable architecture allows updating of MDP

executable code.

The SmartDAA Interface communicates with, and

supplies power and clock to, the LSD through the

DIB.

The input clock frequency is 28.224 MHz and is

supplied by the MCU. The operating voltage is +3.3V

with +5V tolerant inputs.

ADPCM voice processing is supported.

Downloading of MDP code from the MCU is

supported.

Digital Isolation Barrier (DIB) (OEM Supplied)

The DIB electrically DC isolates the MDP from the

LSD. The MDP is connected to a fixed digital ground

and operates with standard CMOS logic levels. The

LSD is connected to a floating ground and can

tolerate high voltage input (compatible with

telephone line and typical surge requirements).

A digital transformer (DXFMR) in the DIB power

channel couples power and clock digital waveforms

from the MDP to the LSD.

The DIB data channel supports bidirectional half-

duplex serial transfer of data, control, and status

information between the MDP and the LSD over two

lines.