5228-DS09-405-R datasheet(63/100 Pages) BOARDCOM

63 / 100 page

Data Sheet

BCM5228

7/12/04

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

Document

5228-DS09-405-R

100BASE-X False Carrier Sense Counter

Page 51

100BASE-X FALSE CARRIER SENSE COUNTER

RMII/SMII Overrun/Underrun Counter [7:0]. The RMII/SMII Overrun/Underrun Counter increments each time the

BCM5228 detects an overrun or underrun of the RMII/SMII 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 BCM5228 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 it is cleared.

100BASE-X DISCONNECT COUNTER

RMII/SMII Fast RXD. Extended FIFO operation only. Bit 15 of the Disconnect Counter register indicates the FIFO state

machine has detected fast receive data relative to the REF_CLK input.

RMII/SMII Slow RXD. Extended FIFO operation only. Bit 14 of the Disconnect Counter register indicates the FIFO state

machine has detected slow receive data relative to the REF_CLK input.

Table 30: 100BASE-X False Carrier Sense Counter (Address 19d, 13h)

Bit

Name

R/W

Description

Default

15:8

RMII/SMII Overrun/Underrun

Counter [7:0]

R/W

Number of RMII 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

Table 31: 100BASE-X Disconnect Counter

Bit

Name

R/W

Description

Default

RMII/SMII Fast RXD

R/O

1 = In extended FIFO mode, detect fast receive data

0 = Normal

RMII/SMII Slow RXD

R/O

0 = Normal

1 = In extended FIFO mode, detect slow receive data

13:8

Reserveda

a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”

–

000010

7:0

Reserveda

––

00h

Note: R/W = Read/Write, RO = Read Only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL and LH Clear

after read operation.

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