AM79C971VCW datasheet(250/265 Pages) AMD

250 / 265 page

E-4

Am79C971

Advertisement Ability Register

Bit

Name

Description

NA (0)

Next Page. Defaults 0

to ZERO after power-

up and after hardware

resets

(H_RESET).

This bit indicates the

ability of the PHY to

send

and

receive

message pages after

the initial base code

word has been sent.

The

Am79C971

controller

does

not

support Next Pages

currently.

RES

Read

ZERO

always.

Remote

Fault.

Defaults

ZERO

after power-up and

after hardware resets

(H_RESET). This bit

indicates

that

have

detected

remote fault with the

other node.

12-5

TAF

Technology

Ability

Field.

The

Am79C971 controller

will

only

support

10BaseT or 10BaseT

full duplex with the

internal PHY device.

When

using

the

internal PHY the TAF

will

set

00000011b always.

4-0

Selector Field. The

Am79C971 controller

will

only

currently

support IEEE 802.3

messages.

When

using

the

internal

PHY the SF will be

set to 00001b always.

Ability Register

Bit

Name

Description

These fields are identical to the previous and are valid

for the node in which we are currently engaged.

Next Page. Defaults

to ZERO after power-

up and after hardware

resets (H_RESET).

ACK

Acknowledge.

Defaults

ZERO

after power-up and

after hardware resets

(H_RESET).

Remote

Fault.

Defaults

ZERO

after power-up and

after hardware resets

(H_RESET)

12-5

TAF

Technology

Ability

Field. Defaults to all

ZEROs after power-

up and after hardware

resets (H_RESET)

4-0

Selector

Field.

Defaults to all ZEROs

after power-up and

after hardware resets

(H_RESET)

Bit

Name

Description

This is the catch all register of odds and ends that did

not fit in other registers.

15-5

RES

Reserved. Read and

written as ZERO’s.

PDF

Parallel

Detection

Fault.

Defaults

ZERO after power-up

and after hardware

resets

(H_RESET).

This bit indicates that

more than one PHY

has responded to a

valid

link

none

have responded to a

valid link. Either way

AM79C971VCW Datasheet(PDF) 250 Page - Advanced Micro Devices

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