5238-DS03-405-R datasheet(47/76 Pages) BOARDCOM

47 / 76 page

Advance Data Sheet

BCM5238

1/31/03

Broa d c om Co rp o r a t i o n

Document

5238-DS03-405-R

100BASE-X Receive Error Counter

Page 39

Transmit Error Detected. The PHY returns a 1 in bit 2 if a packet was received with a transmit error code since the last time

this register was read. Otherwise, it returns a 0.

Lock Error Detected. The PHY returns a 1 in bit 1 if the descrambler has lost lock since the last time this register was read.

Otherwise, it returns a 0.

MLT3 Code Error Detected. The PHY returns a 1 in bit 0 if an MLT3 coding error has been detected in the receive data

stream since the last time this register was read. Otherwise, it returns a 0.

100BASE-X RECEIVE ERROR COUNTER

Receive Error Counter [15:0]. This counter increments each time the BCM5238 receives a noncollision packet containing

at least one receive error. The counter automatically clears itself when read. When the counter reaches its maximum value,

FFh, it stops counting receive errors until cleared

100BASE-X FALSE CARRIER SENSE COUNTER

Overrun/Underrun Counter [7:0]. The overrun/underrun counter increments each time the BCM5238 detects an overrun

or underrun of the receive FIFOs. The counter automatically clears itself when read. When the counter reaches its maximum

value, FFh, it stops counting overrun/underrun errors until cleared.

False Carrier Sense Counter [7:0]. This counter increments each time the BCM5238 detects a false carrier on the receive

input. This counter automatically clears itself when read. When the counter reaches its maximum value, FFh, it stops

counting false carrier sense errors until cleared.

Table 28: 100BASE-X Receive Error Counter (Address 18d, 12h)

Bit

Name

R/W

Description

Default

15:0

Receive Error Counter [15:0]

R/W

Number of noncollision packets with receive errors

since last read

0000h

Table 29: 100BASE-X False Carrier Sense Counter (Address 19d, 13h)

Bit

Name

R/W

Description

DEFAULT

15:8

SMII Overrun/Underrun

Counter [7:0]

R/W

Number of overruns/underruns since last read

00h

7:0

False Carrier Sense Counter

[7:0]

R/W

Number of false carrier sense events since last read

00h

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