5222-DS00-R datasheet(40/76 Pages) BOARDCOM

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BCM5222

Preliminary Data Sheet

7/20/04

Broadcom Corporation

Page 28

100BASE-TX Auxiliary Control Register

Document 5222-DS02-405-R

MESSAGE PAGE

Differentiates a Message Page from an Unformatted Page.

ACKNOWLEDGE 2

Indicates that link partner has the ability to comply with the message.

TOGGLE

Used by the Arbitration function to ensure synchronization with the link partner during next page exchange.

MESSAGE CODE FIELD

An 11-bit-wide field, encoding 2048 possible messages.

UNFORMATTED CODE FIELD

An 11-bit-wide field, which may contain an arbitrary value.

100BASE-TX AUXILIARY CONTROL REGISTER

Table 15: 100BASE-TX Auxiliary Control Register (Address 16d, 10h)

Bit

Name

R/W

Description

Default

15:14

Reserved

Write as 0, Ignore when read

Transmit Disable

R/W

1 = Transmitter disabled in PHY

0 = Normal operation

12:11

Reserved

R/W

Write as 0, Ignore when read

Bypass 4B5B Encoder/

Decoder

R/W

1 = Transmit and receive 5B codes over MII pins

0 = Normal MII interface

Bypass Scrambler/

Descrambler

R/W

1 = Scrambler and descrambler disabled

0 = Scrambler and descrambler enabled

Bypass NRZI Encoder/

Decoder

R/W

1 = NRZI encoder and decoder is disabled

0 = NRZI encoder and decoder is enabled

Bypass Receive Symbol

Alignment

R/W

1 = 5B receive symbols not aligned

0 = Receive symbols aligned to 5B boundaries

Baseline Wander Correction

Disable

R/W

1 = Baseline wander correction disabled

0 = Baseline wander correction enabled

5:0

Reserved

R/W

Write as 0, Ignore when read

00000

Note: R/W = Read/Write, RO = Read only, SC = Self Clear, LL = Latched Low, LH = Latched High, LL & LH Clear after

read operation. Use default values of reserved bit(s) when writing to reserved bit(s).

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