5228-DS07-R datasheet(61/100 Pages) BOARDCOM

61 / 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 Auxiliary Status Register

Page 49

Bypass Receive Symbol Alignment. Receive symbol alignment can be bypassed by writing a 1 to bit 7 of MII register 10h.

When used in conjunction with the bypass 4B5B encoder/decoder bit, unaligned 5B codes are placed directly on the RXER

and RXD1, RXD0 pins.

Baseline Wander Correction Disable. The baseline wander correction circuit can be disabled by writing a 1 to bit 6 of MII

FEF Enable. Controls the far-end fault mechanism associated with 100BASE-FX operation. A 1 enables the FEF

function, and a 0 disables it.

Extended FIFO Enable. Controls the extended receive FIFO mechanism. This bit may have to be set if the Jumbo

Packet Enable bit is set. See Table 4 on page 27 for details.

100BASE-X AUXILIARY STATUS REGISTER

Table 28: 100BASE-X Auxiliary Status Register (Address 17d, 11h)

Bit

Name

R/W

Description

Default

15:12

Reserveda

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

–

–0

R/SMII Overrun/Underrun

Detected

1 = Error detected

0 = No error

FX Mode

1 = 100BASE-FX mode

0 = 100BASE-TX or 10BASE-T mode

9Locked

1 = Descrambler locked

0 = Descrambler unlocked

Current 100BASE-X

Link Status

1 = Link pass

0 = Link fail

Remote Fault

1 = Remote fault detected

0 = No remote fault detected

Reserveda

––

False Carrier Detected

1 = False carrier detected since last read

0 = No false carrier since last read

Bad ESD Detected

1 = ESD error detected since last read

0 = No ESD error since last read

Receive Error Detected

1 = Receive error detected since last read

0 = No receive error since last read

Transmit Error Detected

1 = Transmit error code received since last read

0 = No transmit error code received since last read

Lock Error Detected

1 = Lock error detected since last read

0 = No lock error since last read

MLT3 Code Error Detected

1 = MLT3 code error detected since last read

0 = No MLT3 code error since last read

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

after read operation.

5228-DS07-R 数据表(PDF) 61 Page - Broadcom Corporation.

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