AM79C961AVC datasheet(31/206 Pages) AMD

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Am79C961A

PIN DESCRIPTION:

NETWORK INTERFACES

AUI

CI+, CI–

Control Input

Input

This is a differential input pair used to detect Collision

(Signal Quality Error Signal).

DI+, DI–

Data In

Input

This is a differential receive data input pair to the PC-

net-ISA II controller.

DO+, DO–

Data Out

Output

This is a differential transmit data output pair from the

PCnet-ISA II controller.

Twisted Pair Interface

RXD+, RXD–

Receive Data

Input

This is the 10BASE-T port differential receive input

pair.

TXD+, TXD–

Transmit Data

Output

These are the 10BASE-T port differential transmit

drivers.

TXP+, TXP–

Transmit Predistortion Control

Output

These are 10BASE-T transmit waveform pre-distortion

control differential outputs.

PIN DESCRIPTION:

IEEE 1149.1 (JTAG) TEST ACCESS PORT

TCK

Test Clock

Input

This is the clock input for the boundary scan test mode

operation. TCK can operate up to 10 MHz. TCK does

not have an internal pull-up resistor and must be con-

nected to a valid TTL level of high or low. TCK must not

be left unconnected.

TDI

Test Data Input

Input

This is the test data input path to the PCnet-ISA II con-

troller. If left unconnected, this pin has a default value

of HIGH.

TDO

Test Data Output

Output

This is the test data output path from the PCnet-ISA II

controller. TDO is tri-stated when JTAG port is inactive.

TMS

Test Mode Select

Input

This is a serial input bit stream used to define the spe-

cific boundary scan test to be executed. If left uncon-

nected, this pin has a default value of HIGH.

PIN DESCRIPTION:

POWER SUPPLIES

All power pins with a “D” prefix are digital pins con-

nected to the digital circuitry and digital I/O buffers. All

power pins with an “A” prefix are analog power pins

connected to the analog circuitry. Not all analog pins

are quiet and special precaution must be taken when

doing board layout. Some analog pins are more noisy

than others and must be separated from the other

analog pins.

AVDD1–4

Analog Power (4 Pins)

Power

Supplies power to analog portions of the PCnet-ISA II

controller. Special attention should be paid to the

printed circuit board layout to avoid excessive noise on

these lines.

AVSS1–2

Analog Ground (2 Pins)

Power

Supplies ground reference to analog portions of PC-

net-ISA II controller. Special attention should be paid to

the printed circuit board layout to avoid excessive noise

on these lines.

DVDD1–7

Digital Power (7 Pins)

Power

Supplies power to digital portions of PCnet-ISA II con-

troller. Four pins are used by Input/Output buffer drivers

and two are used by the internal digital circuitry.

DVSS1–13

Digital Ground (13 Pins)

Power

Supplies ground reference to digital portions of PC-

net-ISA II controller. Ten pins are used by Input/Output

buffer drivers and two are used by the internal digital

circuitry.

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