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GENERAL DESCRIPTION

The Am7968 TAXIchip Transmitter and Am7969 TAXIchip Receiver Chipset is a general-purpose interface for very high-speed (4–17.5 Mbyte/s, 40–175 Mbaud serially) point-to-point communications over coaxial or fiber-optic media. The TAXIchip set emulates a pseudo-parallel register. They load data into one side and output it on the other, except in this case, the “other” side is separated by a long serial link.

DISTINCTIVE CHARACTERISTICS

■ Parallel TTL bus interface

— Eight Data and four Command Pins

— or nine Data and three Command Pins

— or ten Data and two Command Pins

■ Transparent synchronous serial link

— +5 V ECL Serial I/O

— AC or DC coupled

— NRZI 4B/5B, 5B/6B encoding/decoding

■ Drive coaxial cable or twisted pair directly

■ Easy interface with fiber optic data links

■ 32–140 Mbps (4–17.5 Mbyte/s) data throughput

■ Asynchronous input using STRB/ACK

■ Automatic MUX/DEMUX of Data and Command

■ Complete on-chip PLL, Crystal Oscillator

■ Single +5 V supply operation

■ 28-pin PLCC or DIP or LCC