器件名称: CMX989
功能描述: CDPD MAC and Data Pump Processor
文件大小: 440.13KB 共31页
简 介:CMX989
CDPD MAC and Data Pump Processor
D/989/2 October 2001 Provisional Information
Features
Reed-Solomon Encoder, Decoder and Error Correction MAC and Physical Layer Functions: Minimize Host Controller Burden and Power Tx and Rx Byte-Wide CDPD Frame FIFOs
Applications
CDPD (Cellular Digital Packet Data) Terminals PCMCIA/PC-Card Wireless Modem Modules Wireless Internet Terminals Portable and Mobile Wireless Data Terminals Line Power/Battery Applications 19.2kbps (BT = 0.5) Full Duplex GMSK Data Modems
Encapsulates/De-Encapsulates CDPD Frames to/from Over-Air Baseband Signals Parallel Bus Hardware Interface to Host CPU 2.7V to 5.5V Supply, 28-Pin TSSOP Package
1.1
Brief Description
The highly integrated CMX989 CDPD MAC and Data Pump Processor integrates complex CDPD MAC and physical layer functions to serve as a core engine for high performance, low power CDPD terminal designs. MAC layer functions decouple the host CPU from the CDPD airlink to simplify and reduce CDPD protocol stack programming, free CPU capacity for applications, eliminate interface components, and allow CPU sleep time for power savings. Physical layer functions mate MAC layer to baseband radio signals with minimal host involvement. MAC and physical layer functions are intelligently coupled to meet airlink timing requirements. For example: Tx emissions automatically start in synchronisation with Forward Channel busy/idle status. The Rx CDPD frame FIFO is automatically managed to wait for va……
