AM79C970 datasheet(19/168 Pages) AMD

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AMD

P R E L I M I N A R Y

1-886

Am79C970

Attachment Unit Interface

Collision In

Input

A differential input pair signaling the PCnet-PCI control-

ler that a collision has been detected on the network me-

dia, indicated by the CI

± inputs being driven with a

10 MHz pattern of sufficient amplitude and pulse width

to meet ISO 8802-3 (IEEE/ANSI 802.3) standards. Op-

erates at pseudo ECL levels.

Data In

Input

A differential input pair to the PCnet-PCI controller car-

rying Manchester encoded data from the network. Oper-

ates at pseudo ECL levels.

Data Out

Output

A differential output pair from the PCnet-PCI controller

for transmitting Manchester encoded data to the net-

work. Operates at pseudo ECL levels.

Twisted-Pair Interface

RXD

10BASE-T Receive Data

Input

10BASE-T port differential receivers.

TXD

10BASE-T Transmit Data

Output

10BASE-T port differential drivers.

TXP

10BASE-T Pre-Distortion Control

Output

These outputs provide transmit pre-distortion control in

conjunction with the 10BASE-T port differential drivers.

Test Interface

NOUT

NAND Tree Out

Output

The results of the NAND tree testing can be observed on

the NOUT pin. NOUT will be constantly high, when

RST

is deasserted.

Power Supply Pins

Analog 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 Technical Manual (PID

#18216A) 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 Technical Manual (PID #18216A) for

details.

Digital Power Supply Pins

VDD

Digital Power (6 Pins)

Power

There are 6 power supply pins that are used by the inter-

nal digital circuitry. All VDD pins must be connected to a

+5 V supply.

VDDB

I/O Buffer Power (4 Pins)

Power

There are 4 power supply pins that are used by the PCI

bus Input/Output buffer drivers. All VDDB pins must be

connected to a +5 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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