AM79C970A datasheet(141/219 Pages) AMD

141 / 219 page

P R E L I M I N A R Y

AMD

141

Am79C970A

Table 30. BCR Registers

Programmability

RAP

MNEMONIC

Default

Name

User

EEPROM

MSRDA

0005h

Reserved

MSWRA

0005h

Reserved

0002h

Miscellaneous Configuration

Yes

Reserved

N/A

Reserved

LNKST

00C0h

Link Status LED

Yes

LED1

0084h

LED1 Status

Yes

LED2

0088h

LED2 Status

Yes

LED3

0090h

LED3 Status

Yes

Reserved

N/A

Reserved

FDC

0000h

Full-Duplex Control

Yes

10–15

Reserved

N/A

Reserved

IOBASEL

N/A

Reserved

IOBASEU

N/A

Reserved

BSBC

9001h

Burst and Bus Control

Yes

EECAS

0002h

EEPROM Control and Status

Yes

SWS

0000h

Software Style

Yes

INTCON

N/A

Reserved

PCILAT

FF06h

PCI Latency

Yes

BCR0: Master Mode Read Active

Bit

Name

Description

31–16

RES

Reserved locations. Written as

ZEROs and read as undefined.

15–0 MSRDA

Reserved

locations.

After

H_RESET, the value in this

ting of this register has no effect

on any PCnet-PCI II controller

function. It is only included for

software compatibility with other

PCnet family devices.

Read always. MSRDA is read

only

Write

operations

have

no effect.

BCR1: Master Mode Write Active

Bit

Name

Description

31–16

RES

Reserved locations. Written as

ZEROs and read as undefined.

15–0 MSWRA

Reserved

locations.

After

H_RESET, the value in this reg-

ister will be 0005h. The setting of

this register has no effect on any

PCnet-PCI II controller function.

It is only included for software

compatibility with other PCnet

family devices.

Read always. MSWRA is read

only

Write

operations

have

no effect.

BCR2: Miscellaneous Configuration

Bit

Name

Description

Note that bits 15–0 in this register

are programmable through the

external EEPROM. Reserved

bits and read-only bits should be

programmed to ZERO.

31–16 RES

Reserved locations. Written as

ZEROs and read as undefined.

RES

Reserved location. Written as

ZERO and read as undefined.

14 TMAULOOP

When set, this bit allows external

loopback packets to pass on to

the network through the T-MAU

interface, if the T-MAU interface

has been selected. If the T-MAU

interface has not been selected,

then this bit has no effect.

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