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CN8223 Datasheet(PDF) 11 Page - Synaptics Incorporated. |
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CN8223 Datasheet(HTML) 11 Page - Synaptics Incorporated. |
11 / 161 page 100046C Conexant 1-1 1 1.0 Product Description The CN8223 ATM Physical Interface (PHY) device is a transmitter/receiver which converts several types of frames to ATM cells and vice versa. The device contains framers for DS3, E3, E4, STS-1, STS-3c, and STM-1. This chapter provides an overview of the CN8223, describing its primary features and applications. A block diagram and a logic diagram are included. 1.1 Block Diagram Figure 1-1 is a detailed block diagram of the CN8223. The host system transmits octet-wide data to the CN8223 via the UTOPIA or FIFO ports. This data is assembled into ATM cells by the PHY and formatted for serial line transmission by the CN8223’s line framers. In the receive direction, serial network data is framed into octets by either internal or external line framers and passed to the ATM cell processing block. Octet data is then aligned into ATM cells, checked, and sent through the UTOPIA or FIFO ports to the host system. The line framer block connects to external interfaces for line reception and transmission. The line framer has interfaces for seven data rates and provisions for external serial or parallel framers. Also included are overhead interfaces, data links, and event counters. The HEC/PLCP ATM cell alignment block accepts octet data from the line framer block. It generates cells for transmission and validates received cells. Included are HEC/PLCP generators and detectors, data scramblers, and counters. The FIFO Port/UTOPIA interface communicates with the next layer of ATM processing, usually residing in the host system. It directs received cell traffic to four ports, controls transmit priority and rate, and has counters for events and errors. |
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