AM79C971VCW datasheet(248/265 Pages) AMD

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E-2

Am79C971

NA (0)

Isolate.

Defaults

ZERO after power-up

and after hardware

resets

(H_RESET).

This bit only applies

to the external PHY.

This bit is used when

multiple PHY’s can be

attached

the

Am79C971 MII.

RAN

Restart

Auto

Negotiation. Defaults

to ZERO after power-

up and after hardware

resets ( H_RESET ).

This bit is used when

the software needs to

reset

the

Auto-

Negotiation process.

For

use

with

external PHY without

software intervention.

Duplex

Mode.

Defaults

ZERO

after power-up and

after hardware resets

(H_RESET). This bit

sets the full-duplex

feature for the internal

external

PHY’s.

Only valid when the

Auto-Negotiation

Enable bit is not set.

Collision

Test.

Defaults

ZERO

after power-up and

after hardware resets

(H_RESET). This bit

only

useful

for

testing the COL pin

on the MII and is not

supported

without

software intervention.

0-6

RES

Reserved

locations.

Defaults to all ZEROs

after power-up and

after hardware resets

(H_RESET).

Bit

Name

Default

Description

100T4

100Base-T4.

Defaults

ZERO

after power-up and

after hardware resets

(H_RESET).

Indicates

that

the

PHY is 100BASE-T4

capable. Not used on

the internal PHY.

100XFD

100Base-X

Full

Duplex. Defaults to

ZERO after power-up

and after hardware

resets

(H_RESET).

Indicates

that

the

PHY is 100BASE-TX

Full-Duplex capable.

100XHD

100Base-X

Half

Duplex. Defaults to

ZERO after power-up

and after hardware

resets

(H_RESET).

Indicates

that

the

PHY is 100BASE-TX

Half-Duplex capable.

Not

used

the

internal PHY

10FD

10Base Full Duplex.

Defaults to ONE after

power-up and after

hardware

resets

(H_RESET).

Indicates

that

the

PHY

10BASE-T

Full-Duplex capable.

10HD

10Base Half Duplex.

Defaults to ONE after

power-up and after

hardware

resets

(H_RESET).

Indicates

that

the

PHY

10BASE-T

Half-Duplex capable.

10-7

RES

Reserved

locations.

These

locations

should be read and

written as ZEROs.

AM79C971VCW Datasheet(PDF) 248 Page - Advanced Micro Devices

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