Maker : Agere Systems
Part No. : OCM-22

  Datasheet PDF : OCM-22.pdf
  Cross Reference : OCM-22 Cross Reference
  Buy Component : OCM-22 Find Stock and Price

Shortcut : OCM-22 

Product Information

www.DataSheet4U.com Product Brief Rev 1.0 April 2005 OCM-22 One-Chip Modem for Embedded Applications Features ■ Introduction OCM-22 is a low-cost modem solution for low-speed embedded applications. OCM22 includes a simplified AT command set and supports data rates from 300 bits/s (V.21) to 2400 bits/s (V.22bis) and only requires a CSP1034 or CSP1035A to make a complete modem. OCM-22 provides a choice of two system interfaces, a serial interface or an 8-bit parallel interface. The serial interface can be used in systems that have an available serial port. In other systems, the parallel interface can be I/O or memory mapped onto typical processor buses. In typical applications, OCM-22 is paired with Agere's CSP1035A silicon DAA to implement a low-cost worldwide modem. OCM-22 can also be used with Agere's CSP1034 line codec for traditional transformer-based DAA designs. Controller and data pump in a single 48-pin TQFP with two integrated peripheral interfaces: — Partial ISA (8-bit parallel). — RS232. Data mode capabilities range: — V.22bis: 2400 bits/s. — V.22: 1200 bits/s. — V.23: 1200/600 bits/s. — V.21: 300 bits/s. — Bell 212A: 1200 bits/s. — Bell 103: 300 bits/s. Serial DTE interface: — Hardware and software flow control. — Asynchronous data format: 19,200 bits/s, 8-bit data, no parity, 1 stop bit. Parallel DTE interface for connection to system I/O or memory bus. DAA support: — CSP1035A silicon DAA. — CSP1034C with transformer DAA. Supports low-cost, call-progress speaker. Support for country-specific settings (homologation) under host control. Supports extension phone detection for set-top box applications when used with CSP1035A DAA. Customized feature set using code downloads into on-chip RAM. Internal PLL to generate high-speed clocks from external low-cost crystal. Single 3.3 V supply. Type 1 caller ID support (US, UK, France, Germany, and Spain). ■ ■ ■ ■ Applications ■ ■ ■ ■ ■ ■ ■ Set-top-box Verification machines Point of sale Franking machines Other low-speed data ■ ■ ■ ■ ■ 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 MICROPROCESSOR 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 MICROPROCESSOR 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 Product Brief Rev 1.0 April 2005 OCM-22 One-Chip Modem for Embedded Applications Functional Description (continued) OCM-22 DEVICE DATA[7:0] ADDR[1:0] READN WRITEN INTRPT ADDRESS DECODE HD[7:0] HA[1:0] HRDN HWRN HINTR HCSN 5-8104 (F) a Figure 3. Parallel Interface to DIA Port Internal PLL for Low-Speed Crystal Support OCM-22 supports low-speed, external crystals by incorporating a PLL to support ...

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