AM79C978AVCW datasheet(151/256 Pages) AMD

151 / 256 page

Am79C978A

151

This bit is always read/write ac-

cessible. 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.

This bit is always read/write ac-

cessible. 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.

This bit is always read/write ac-

cessible. 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.

This bit is always read/write ac-

cessible. XMTE is cleared by

H_RESET and is not affected

by S_RESET or setting the

STOP bit.

POWER

Power. When this bit is set to 1,

the device is operating in HIGH

power mode.

RCVE

Receive Status Enable. When

this bit is set, a value of 1 is

passed to the LEDOUT bit in this

activity on the network.

This bit is always read/write ac-

cessible. RCVE is set to 1 by

H_RESET and is not affected

by S_RESET or setting the

STOP bit.

SPEED

Speed. When this bit is set to 1,

the device is operating in HIGH

speed mode.

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.

This bit is always read/write ac-

cessible. 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.

The logical value of the LEDOUT

status signal is determined by the

settings of the individual Status

Enable bits of the LED register

(bits 8 and 6-0).

This bit is read accessible al-

ways. This bit is read only; writes

have no effect. LEDOUT is unaf-

fected by H_RESET, S_RESET,

or STOP.

AM79C978AVCW Datasheet(PDF) 151 Page - Advanced Micro Devices

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