AM79C970 datasheet(113/168 Pages) AMD

113 / 168 page

AMD

P R E L I M I N A R Y

1-980

Am79C970

each new occurrence of the en-

abled function for this LED

output.

A value of 0 disables the signal.

A value of 1 enables the signal.

LNKSTE

Link Status Enable. Indicates the

current link status on the Twisted

Pair interface. When this bit is en-

abled, a value of ONE will be

passed to the LEDOUT signal to

indicate that the link status state

is PASS. A value of ZERO will be

passed to the LEDOUT signal to

indicate that the link status state

is FAIL.

A value of 0 disables the signal.

A value of 1 enables the signal.

RCVME

Receive Match status Enable. In-

dicates receive activity on the

network that has passed the ad-

dress match function for this

node.

All

address

matching

modes are included: Physical,

Logical

filtering

and

Promiscuous.

A value of 0 disables the signal.

A value of 1 enables the signal.

XMTE

Transmit status Enable. Indi-

cates

PCnet-PCI

controller

transmit activity.

A value of 0 disables the signal.

A value of 1 enables the signal.

RXPOLE

Receive Polarity status Enable.

Indicates the current Receive

Polarity condition on the Twisted

Pair interface. A value of ONE in-

dicates that the polarity of the

RXD

± pair has been reversed. A

value of ZERO indicates that the

polarity of the RXD

± pair has not

been reversed.

Receive polarity indication is

valid only if the T-MAU is in the

Link Pass state

A value of 0 disables the signal.

A value of 1 enables the signal.

RCVE

Receive status Enable. Indicates

receive activity on the network.

A value of 0 disables the signal.

A value of 1 enables the signal.

JABE

Jabber status Enable. Indicates

that the PCnet-PCI controller is

jabbering on the network.

A value of 0 disables the signal.

A value of 1 enables the signal.

COLE

Collision status Enable. Indi-

cates collision activity on the net-

work.

A value of 0 disables the signal.

A value of 1 enables the signal.

BCR6: LED2 Status

Bit

Name

Description

31–16

RES

Reserved locations. Written as

ZEROs and read as undefined.

15–0

LED2

Reserved locations. After H_RE-

SET, the value in this register will

be 0x0088h. The settings of this

PCnet-PCI controller function.

Writes to this register have no ef-

fect on the operation of the

PCnet-PCI controller.

BCR7: LED3 Status

Bit

Name

Description

BCR7 controls the function(s)

that the

LED3 pin displays. Multi-

ple functions can be simultane-

ously enabled on this LED pin.

The LED display will indicate the

logical OR of the enabled func-

tions. BCR7 defaults to Transmit

Status

(XMT)

with

pulse

stretcher enabled (PSE = 1) and

is fully programmable.

The default setting after H_RE-

SET for the LED3

0090h. The LED3 register

value is unaffected by S_RESET

or STOP.

31–16

RES

Reserved location. Written as

ZEROs and read as undefined.

LEDOUT

This bit indicates the current

(non-stretched) value of the LED

output pin. A value of ONE in this

bit indicates that the OR of the

enabled signals is true.

The logical value of the LEDOUT

status signal is determined by the

settings of the individual Status

Enable bits of the LED register

(Bits 6–0).

This bit is READ only by the host,

and is unaffected by H_RESET,

S_RESET or STOP.

LEDPOL

LED Polarity. When this bit has

the value ZERO, then the LED

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