AM79C978VCSLASHW datasheet(149/261 Pages) AMD

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Am79C978

149

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 cleared 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.

BCR5: LED1 Status

BCR5 controls the function(s) that the LED1 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. BCR5 defaults to

Receive Status (RCV) with pulse stretcher enabled

(PSE = 1) and is fully programmable.

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

gramming of the LED1 Status register is enabled.

When LEDPE is cleared to 0, programming of the

LED1 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 always read accessi-

ble. This bit is read only; writes

have no effect. LEDOUT is unaf-

fected by H_RESET, S_RESET,

or STOP.

LEDPOL

LED Polarity. When this bit has

the value 0, then the LED pin will

be driven to a LOW level whenev-

er the OR of the enabled signals

is true, and the LED pin will be

disabled and allowed to float high

whenever the OR of the enabled

signals is false (i.e., the LED out-

put will be an Open Drain output

and the output value will be the

inverse of the LEDOUT status

bit).

AM79C978VC/W 数据表(PDF) 149 Page - Advanced Micro Devices

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AM79C978VC/W 数据表(PDF) 149 Page - Advanced Micro Devices

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