AM79C978AVCW datasheet(149/256 Pages) AMD

149 / 256 page

Am79C978A

149

operation being enabled, a val-

ue of 0 is passed to the LED-

OUT signal.

This bit is always read/write ac-

cessible. 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.

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

tivity 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.

BCR6: LED2 Status

BCR6 controls the function(s) that the LED2 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.

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

the

LED output pin. A value of 1 in

AM79C978AVCW Datasheet(PDF) 149 Page - Advanced Micro Devices

AM79C978AVCW Datasheet(HTML) 149 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL