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AM79C961KCW

PCnet™-ISA+ Jumperless Single-Chip Ethernet Controller for ISA

Advanced Micro Devices 

AMD

PRELIMINARY

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 PCnet-

ISA+ controller.

DO+, DO–

Data Out

Output

This is a differential transmit data output pair from the

PCnet-ISA+ 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 pullup 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+ control-

ler. 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+

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

unconnected, this pin has a default value of HIGH.

PIN DESCRIPTION:

POWER SUPPLIES

All power pins with a “D” prefix are digital pins connected

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 lay-

out. 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+

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

PCnet-ISA+ 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+ control-

ler. 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

PCnet-ISA+ controller. Ten pins are used by Input/Out-

put buffer drivers and two are used by the internal digital

circuitry.

1-502

Am79C961

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