AM79C975VCW datasheet(212/304 Pages) AMD

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212

Am79C973/Am79C975

P R E L I M INARY

initiated transmission when oper-

ating in half-duplex mode. The

Am79C973/Am79C975 controller

does not retry upon loss of carri-

er. It will continue to transmit the

whole frame until done. LCAR will

not be set when the device is op-

erating in full-duplex mode. LCAR

is not valid in Internal Loopback

Mode.

LCAR

set

the

Am79C973/Am79C975 controller

and cleared by the host.

LCAR will be set when the PHY is

in Link Fail state during transmis-

sion.

RTRY

Retry error indicates that the

transmitter has failed after 16 at-

tempts to successfully transmit a

message, due to repeated colli-

sions on the medium. If DRTY is

set to 1 in the MODE register,

RTRY will set after one failed

transmission attempt. RTRY is

set

the

Am79C973/

Am79C975

controller

and

cleared by the host.

25-4

RES

Reserved locations.

3-0

TRC

Transmit Retry Count. Indicates

the number of transmit retries of

the associated packet. The maxi-

mum count is 15. However, if a

RETRY error occurs, the count

will roll over to 0.

In this case only, the Transmit

Retry Count value of 0 should be

interpreted as meaning 16. TRC

is written by the Am79C973/

Am79C975 controller into the last

transmit descriptor of a frame, or

when

error

terminates

frame. Valid only when OWN is

cleared to 0.

TMD3

Bit

Name

Description

31-0

User Space. Reserved for user

defined space.

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