AM79C970 datasheet(112/168 Pages) AMD

112 / 168 page

P R E L I M I N A R Y

AMD

1-979

Am79C970

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, Promiscuous

and Broadcast.

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 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.

BCR5: LED1 Status

Bit

Name

Description

BCR5 controls the function(s)

that the

LED1 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. BCR1 defaults to Receive

Status

(RCV)

with

pulse

stretcher enabled (PSE = 1) and

is fully programmable.

The default setting after H_RE-

SET for the LED1 register is

0084h. The LED1 register value

is unaffected by S_RESET or

STOP.

31–16

RES

Reserved locations. Written as

ZERO 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

pin will be driven to a LOW level

whenever the OR of the enabled

signals is true and the LED pin

will be disabled and allowed to

float high whenever the OR of the

enabled signals is false. (i.e. the

LED output will be an Open Drain

output and the output value will

be the inverse of the LEDOUT

status bit.)

When this bit has the value ONE,

then the LED pin will be driven to

a HIGH level whenever the OR of

the enabled signals is true and

the LED pin will be driven to a

LOW level whenever the OR of

the enabled signals is false. (i.e.

the LED output will be a Totem

Pole output and the output value

will be the same polarity as the

LEDOUT status bit.)

The setting of this bit will not af-

fect the polarity of the LEDOUT

bit for this register.

LEDDIS

LED Disable. This bit is used to

disable the LED output. When

LEDDIS has the value ONE, then

the LED output will always be

tristated. When LEDDIS has the

value ZERO, then the LED out-

put value will be governed by the

LEDOUT and LEDPOL values.

12–8

RES

Reserved locations. Write as ZE-

ROS, read as undefined.

A value of 0 disables the signal.

A value of 1 enables the signal.

PSE

Pulse Stretcher Enable. Extends

the LED illumination time for

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