AM79C975VCW datasheet(165/304 Pages) AMD

165 / 304 page

Am79C973/Am79C975

165

P R E L I M INARY

LEDDIS

LED Disable. This bit is used to

disable the LED output. When

LEDDIS has the value 1, then the

LED output will always be dis-

abled. When LEDDIS has the val-

ue 0, then the LED output value

will be governed by the LEDOUT

and LEDPOL values.

Read/Write accessible always.

LEDDIS is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

100E

100 Mbps Enable. When this bit

is set to 1, a value of 1 is passed

to the LEDOUT bit in this register

when the Am79C973/Am79C975

controller is operating at 100

Mbps mode.

Read/Write accessible always.

100E is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

11-10 RES

Reserved locations. Written and

read as zeros.

MPSE

Magic Packet Status Enable.

When this bit is set to 1, a value of

1 is passed to the LEDOUT bit in

this register when Magic Packet

frame mode is enabled and a

Magic Packet frame is detected

on the network.

Read/Write accessible always.

MPSE is cleared by H_RESET

and is not affected by S_RESET

or setting the STOP bit.

FDLSE

Full-Duplex Link Status Enable.

Indicates the Full-Duplex Link

Test Status. When this bit is set,

a value of 1 is passed to the LED-

OUT signal when the Am79C973/

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

when in Link Pass state.

Read/Write accessible always.

LNKSE is set to 1 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

AM79C975VCW Datasheet(PDF) 165 Page - Advanced Micro Devices

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