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DS56-L490-001

V.90/K56flex™ PC Card Device Sets for Host-Controlled, Low Power Applications

Conexant Systems 

HCFL/56

V.90/K56flex PC Card Device Sets for Host-Controlled, Low Power Applications

Description

Host Modem Software

General

The modem device set, consisting of separate

PCMCIA Bus Interface (L5502-11) and modem data

pump (MDP) devices, provides the processing core

for a complete modem design. The OEM adds BIF

crystal, discrete components, and a telephone

line/telephone/voice/-TAM/analog cellular interface

circuit to complete the modem system. Table 1

shows the supported functions by product family.

Dialing, call progress, V.80, telephone line interface,

voice/TAM, speakerphone, and analog cellular

phone interface functions are supported and

controlled through the AT command set. Connection

to the host/DTE is supported by the PC Card

interface (Figure 1).

For U.S. operation, the modem can operate with a 1-

relay data/fax/TAM DAA interface (Figure 2) or a 2-

relay data/fax/TAM/V.61/Speakerphone DAA

interface

(Figure 3).

The host modem software performs two distinct

tasks:

1. General modem control which includes

command sets, fax Class 1, voice/TAM,

speakerphone, error correction, data

compression, cell phone drivers, and operating

system interface functions.

2. Modem data pump control. Binary executable

code controlling MDP operation is downloaded

as required during operation. Signal processing,

including data and fax modulation and

demodulation, as well as voice sampling, is

performed in the hardware DSP.

Configurations of the modem software are provided

to support the modem models listed in Table 1.

PC CARD

BUS

INTERFACE

4

MDM DIC ST

FUNCTION 2

CONTROLLER

(OPTIONAL)

FUNCTION 2

INTERFACE

PCMCIA

BUS I/F

DEVICE

L5502-11:

128-TQFP

MODEM

DATA PUMP

(MDP)

R6785:

144-PIN TQFP

OR

R6764:

100-PIN PQFP

ANALOG

CELLULAR/

TELEPHONE

LINE/

TELEPHONE

HANDSET/

AUDIO

INTERFACE

CIRCUIT

ANALOG

CELLULAR

PHONE

TELEPHONE

LINE

TEL HANDSET

HEADPHONE/

SPEAKER

MICROPHONE

Figure 1. Block Diagram

Conexant

Proprietary Information

md-247F1-1BD-PC

Doc. No. 100586C

November 10, 1999

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