AM7969-125LMC Просмотр технического описания (PDF) - Advanced Micro Devices

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AM7969-125LMC

TAXIchip Integrated Circuits (Transparent Asynchronous Xmitter-Receiver Interface)

Advanced Micro Devices 

FINAL

Am7968/Am7969

TAXIchipTM Integrated Circuits

(Transparent Asynchronous Xmitter-Receiver Interface)

Advanced

Micro

Devices

DISTINCTIVE CHARACTERISTICS

s Parallel TTL bus interface

— Eight Data and four Command Pins

— or nine Data and three Command Pins

— or ten Data and two Command Pins

s Transparent synchronous serial link

— +5 V ECL Serial I/O

— AC or DC coupled

— NRZI 4B/5B, 5B/6B encoding/decoding

s Drive coaxial cable or twisted pair directly

s Easy interface with fiber optic data links

s 32–140 Mbps (4–17.5 Mbyte/s) data

throughput

s Asynchronous input using STRB/ACK

s Automatic MUX/DEMUX of Data and Command

s Complete on-chip PLL, Crystal Oscillator

s Single +5 V supply operation

s 28-pin PLCC or DIP or LCC

GENERAL DESCRIPTION

The Am7968 TAXIchip Transmitter and Am7969

TAXIchip Receiver Chipset is a general-purpose inter-

face for very high-speed (4–17.5 Mbyte/s, 40–175

Mbaud serially) point-to-point communications over co-

axial 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.

The speed of a TAXIchip system is adjustable over a

range of frequencies, with parallel bus transfer rates of

4 Mbyte/s at the low end, and up to 17.5 Mbyte/s at the

high end. The flexible bus interface scheme of the

TAXIchip set accepts bytes that are either 8, 9, or

10 bits wide. Byte transfers can be Data or Command

signaling.

BLOCK DIAGRAM

Am7968

Data Command

N

M

Strobe (STRB)

Acknowledge (ACK

Strobe &

Acknowledge

Input Latch

X1

X2

Clock (CLK)

Data Mode Select (DMS)

Oscillator

and

Clock Gen.

Encoder Latch

Data Encoder

Test Serial In

(TSERIN)

Serial Interface

Note:

Test/Local Select (TLS)

N can be 8, 9, or 10 bits; total of N + M = 12.

Shifter

Media

Interface

(SEROUT+) Serial Out +

(SEROUT–) Serial Out –

07370F-1

Publication# 07370 Rev. F Amendment /0

Issue Date: April 1994

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