AM79C975VCW datasheet(169/304 Pages) AMD

169 / 304 page

Am79C973/Am79C975

169

P R E L I M INARY

Am79C975 controller is function-

ing in a Link Pass state and full-

duplex

operation

enabled.

When

the

Am79C973/

Am79C975 controller is not func-

tioning in a Link Pass state with

full-duplex operation being en-

abled, a value of 0 is passed to

the LEDOUT signal.

Read/Write accessible always.

FDLSE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

PSE

Pulse Stretcher Enable. When

this bit is set, the LED illumination

time is extended for each new oc-

currence of the enabled function

for this LED output. A value of 0

disables the pulse stretcher.

Read/Write accessible always.

PSE is set to 1 by H_RESET and

is not affected by S_RESET or

setting the STOP bit.

LNKSE

Link Status Enable. When this bit

is set, a value of 1 will be passed

to the LEDOUT bit in this register

in Link Pass state.

Read/Write accessible always.

LNKSE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

RCVME

Receive Match Status Enable.

When this bit is set, a value of 1 is

passed to the LEDOUT bit in this

tivity on the network that has

passed the address match func-

tion for this node. All address

matching modes are included:

physical, logical filtering, broad-

cast, and promiscuous.

Read/Write accessible always.

RCVME is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

XMTE

Transmit Status Enable. When

this bit is set, a value of 1 is

passed to the LEDOUT bit in this

activity on the network.

Read/Write accessible always.

XMTE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

RES

Reserved location. Written and

read as zeros.

RCVE

Receive Status Enable. When

this bit is set, a value of 1 is

passed to the LEDOUT bit in this

tivity on the network.

Read/Write accessible always.

RCVE is set to 1 by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

RES

Reserved location. Written and

read as zeros.

COLE

Collision Status Enable. When

this bit is set, a value of 1 is

passed to the LEDOUT bit in this

activity on the network.

Read/Write accessible always.

COLE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

BCR7: LED3 Status

BCR7 controls the function(s) that the LED3 pin dis-

plays. Multiple functions can be simultaneously enabled

on this LED pin. The LED display will indicate the logical

OR of the enabled functions. BCR7 defaults to Transmit

Status (XMT) with pulse stretcher enabled (PSE = 1)

and is fully programmable.

Note: When LEDPE (BCR2, bit 12) is set to 1, pro-

gramming of the LED3 Status register is enabled.

When LEDPE is cleared to 0, programming of the

LED3 register is disabled. Writes to those registers will

be ignored.

Note: Bits 15-0 in this register are programmable

through the EEPROM.

Bit

Name

Description

31-16 RES

Reserved locations. Written as

zeros and read as undefined.

LEDOUT

This bit indicates the current

(non-stretched) value of the LED

output pin. A value of 1 in this bit

indicates that the OR of the en-

abled signals is true.

AM79C975VCW Datasheet(PDF) 169 Page - Advanced Micro Devices

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