Product Brief Rev 1.0
April 2005
OCM-22
One-Chip Modem for Embedded Applications
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.
AGERE SYSTEMS
OCM-22 CONTROLLERLESS MODEM CHIP
U-DAA
OCM-22
SYSTEM
MICRO-
PROCESSOR
CSP1035A (LINE-POWERED)
LINE
CODEC
UNIVERSAL
DAA
REMAINING
COMPONENTS
FOR
U-DAA
TELEPHONE
LINE
PARALLEL/
SERIAL
48-PIN
TQFP
48-PIN TQFP
D5-9559 (F)a R.02
Figure 1. OCM-22 + CSP1035A Universal DAA Chip Set Block Diagram
AGERE SYSTEMS
OCM-22 CONTROLLERLESS MODEM CHIP
OCM-22
SYSTEM
MICRO-
PROCESSOR
CSP1034C LINE
CODEC
STANDARD
DAA CIRCUIT
TELEPHONE
LINE
SERIAL/
PARALLEL
48-PIN
TQFP
48-PIN TQFP
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.
Agere Systems Inc.
2
AGERE [ AGERE SYSTEMS ]
