AM79C978VCSLASHW datasheet(206/261 Pages) AMD

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206

Am79C978

Excessive Deferral on this trans-

mit frame, where Excessive De-

ferral is defined in the ISO 8802-3

(IEEE/ANSI 802.3) standard. Ex-

cessive Deferral will also set the

interrupt bit EXDINT (CSR5, bit

7).

LCOL

Late Collision indicates that a col-

lision has occurred after the first

channel slot time has elapsed.

The

Am79C978

home

networkingAm79C978 controller

does not retry on late collisions.

LCOL is set by the Am79C978

controller and cleared by the

host.

LCAR

Loss of Carrier is set when the

carrier

lost

during

Am79C978

controller

initiated

transmission when operating in

half-duplex

mode.

The

Am79C978 controller does not

retry upon loss of carrier. It will

continue to transmit the whole

frame until done. LCAR will not

be set when the device is operat-

ing in full-duplex mode. LCAR is

not valid in Internal Loopback

Mode.

LCAR

set

the

Am79C978

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 by the Am79C978 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 Am79C978 con-

troller into the last transmit de-

scriptor of a frame, or when an

error terminates a 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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