AM79C971VCW datasheet(157/265 Pages) AMD

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Am79C971

157

P R E L I M INARY

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.

RXPOLE

Receive Polarity Status Enable.

When this bit is set, a value of 1 is

passed to the LEDOUT bit in this

the RXD

± pair has not been re-

versed.

Receive polarity indication is val-

id only if the T-MAU is in link pass

state.

Read/Write accessible always.

RXPOLE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

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.

JABE

Jabber Status Enable. When this

bit is set, a value of 1 is passed to

the LEDOUT bit in this register

when the Am79C971 controller is

jabbering on the network.

Read/Write accessible always.

JABE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

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. The activ-

ity on the collision inputs to the

AUI port within the first 4

µs after

every transmission for the pur-

pose of SQE testing will not

cause the LEDOUT bit to be set.

Read/Write accessible always.

COLE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

BCR6: LED2 Status

BCR6 controls the function(s) that the LED2 pin dis-

plays. Multiple functions can be simultaneously en-

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

logical OR of the enabled functions. BCR6 defaults to

Receive Polarity Status (RXPOL) with pulse stretcher

enabled (PSE = 1) and is fully programmable.

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

gramming of the LED2 Status register is enabled.

When LEDPE is cleared to 0, programming of the

LED2 register is disabled. Writes to those registers will

be ignored.

Note: Bits 15-0 in this register are programmable

through the EEPROM PREAD operation.

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).

Read accessible always. This bit

is read only; writes have no ef-

fect. LEDOUT is unaffected by

H_RESET, S_RESET, or STOP.

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