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 

multiplier is switched out, and the internal logic is

clocked directly from the CLK pin. Test Mode 2 is in-

cluded to ease Automatic Test Equipment (A.T.E.) test-

ing by making the internal logic of the Transmitter

synchronous to the external clock instead of the

internal PLL.

TSERIN

Test Serial Input (Pseudo ECL Input)

This pin is left unconnected in Local Mode operation.

TSERIN can be used to input serial data patterns into

the Shifter in Test Mode 1 operation.

VCC1, VCC2, VCC3

Power Supply

VCC1, VCC2, and VCC3 are +5.0 volt nominal power sup-

ply pins. VCC1 powers TTL I/O, VCC2 powers ECL and

VCC3 powers internal Logic and Analog circuitry.

AMD

X1, X2

Crystal Oscillator Inputs (Inputs)

The two crystal input pins connect to an internal parallel

mode oscillator which operates at the fundamental fre-

quency of the external crystal. The byte rate matches

the crystal frequency. During normal operation, the byte

rate is set by the crystal frequency.

Alternatively, X1 can be driven by an external TTL fre-

quency source. In multiple TAXI systems this external

source could be another Am7968’s CLK output.

Am7968/Am7969

7

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