Agere Systems Inc.

2

Product Brief Rev 1.0

April 2005

One-Chip Modem for Embedded Applications

OCM-22

Functional Description

The Agere Systems OCM-22 chip set is a two-chip solution consisting of an Agere Systems OCM-22 and a

CSP1034C or CSP1035A. A block diagram of the OCM-22 chip sets are illustrated in Figure 1 and Figure 2.

D5-9559 (F)a R.02

Figure 1. OCM-22 + CSP1035A Universal DAA Chip Set Block Diagram

5-9560 (F)a R.02

Figure 2. OCM-22 + CSP1034C Chip Set Block Diagram

DIA Port

OCM-22 provides a system interface for use in embedded applications that requires only two address lines, a read/

write strobe, and a single chip select. The interface feeds directly into the DIAs four registers.

The following diagram shows how the host system and the OCM-22 interface. In this configuration, external logic

decodes the address that selects the DIA port, and the embedded application accesses the four control registers

associated with the DIA port to communicate with OCM-22. This configuration also allows a clean interface to

external plug-and-play and PCMCIA interface devices.

TELEPHONE

LINE

PARALLEL/

OCM-22

48-PIN

TQFP

AGERE SYSTEMS

OCM-22 CONTROLLERLESS MODEM CHIP

REMAINING

COMPONENTS

FOR

U-DAA

48-PIN TQFP

LINE

CODEC

UNIVERSAL

DAA

CSP1035A (LINE-POWERED)

U-DAA

SYSTEM

MICRO-

PROCESSOR

SERIAL

TELEPHONE

LINE

PARALLEL

OCM-22

48-PIN

TQFP

AGERE SYSTEMS

OCM-22 CONTROLLERLESS MODEM CHIP

STANDARD

DAA CIRCUIT

48-PIN TQFP

CSP1034C LINE

CODEC

SYSTEM

MICRO-

PROCESSOR

SERIAL/