91C94 datasheet(41/120 Pages) SMSC

41 / 120 page

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OFFSET

NAME

COUNTER REGISTER

TYPE

READ ONLY

SYMBOL

ECR

Counts four parameters for MAC statistics. When any counter reaches 15 an interrupt is issued. All

counters are cleared when reading the register and do no wrap around beyond 15.

HIGH

BYTE

NUMBER OF EXCESS DEFERRED TX

NUMBER OF DEFERRED TX

LOW

BYTE

MULTIPLE COLLISION COUNT

SINGLE COLLISION COUNT

Each four bit counter is incremented every time

the corresponding event, as defined in the EPH

STATUS REGISTER bit description, occurs.

Note that the counters can only increment once

per enqueued transmit packet, never faster,

limiting the rate of interrupts that can be

generated by the counters. For example if a

packet is successfully transmitted after one

collision the SINGLE COLLISION COUNT field

is incremented by one. If a packet experiences

between 2 to 16 collisions, the MULTIPLE

COLLISION COUNT field is

incremented

one.

packet experiences deferral the

NUMBER

DEFERRED

field

incremented

one,

even

the

packet

experienced

multiple

deferrals

during

its

collision retries.

The

COUNTER

facilitates

maintaining statistics in the AUTO RELEASE

mode

where

transmit

interrupts

are

generated on successful transmissions.

Reading the register in the transmit service

routine will be enough to maintain statistics.

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