AM79C970A datasheet(28/219 Pages) AMD

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AMD

P R E L I M I N A R Y

Am79C970A

operates in the same signaling environment as the PCI

bus interface.

TDI

Test Data In

Input

TDI is the test data input path to the PCnet-PCI II con-

troller. The pin has an internal pull-up resistor. The TDI

input operates in the same signaling environment as the

PCI bus interface.

TDO

Test Data Out

Output

TDO is the test data output path from the PCnet-PCI II

controller. The pin is tri-stated when the JTAG port is in-

active. The TDO output operates in the same signaling

environment as the PCI bus interface.

TMS

Test Mode Select

Input

A serial input bit stream on the TMS pin is used to define

the specific boundary scan test to be executed. The pin

has an internal pull-up resistor. The TMS input operates

in the same signaling environment as the PCI

bus interface.

Test Interface

NOUT

NAND Tree Out

Output

When

RST is asserted, the results of the NAND tree

testing can be observed on the NOUT pin.

Note that the NOUT pin is multiplexed with the

DXCVR pin.

Power Supply Pins

AVDD

Analog Power (4 Pins)

Power

There are four analog +5 V supply pins. Special atten-

tion should be paid to the printed circuit board layout to

avoid excessive noise on these lines. Refer to

Appendix B and the PCnet Family Board Design and

Layout

Recommendations

application

note

(PID

#19595A) for details.

AVSS

Analog Ground (2 Pins)

Power

There are two analog ground pins. Special attention

should be paid to the printed circuit board layout to avoid

excessive noise on these lines. Refer to Appendix B and

the

PCnet

Family

Board

Design

and

Layout

Recommendations application note (PID #19595A)

for details.

VDD

Digital Power (6 Pins)

Power

There are six power supply pins that are used by the in-

ternal digital circuitry. All VDD pins must be connected to

a +5 V supply.

VDDB

I/O Buffer Power (4 Pins)

Power

There are four power supply pins that are used by the

PCI bus input/output buffer drivers. In a system with 5 V

signaling environment, all VDDB pins must be connected

to a +5 V supply. In a system with 3.3 V signaling

nvironment, all VDDB pins must be connected to a

+3.3 V supply.

VSS

Digital Ground (12 Pins)

Ground

There are 12 ground pins that are used by the internal

digital circuitry.

VSSB

I/O Buffer Ground (8 Pins)

Ground

There are 8 ground pins that are used by the PCI bus in-

put/output buffer drivers.

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