5238-DS03-405-R datasheet(44/76 Pages) BOARDCOM

44 / 76 page

BCM5238

Advance Data Sheet

1/31/03

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

Page 36

100BASE-X Auxiliary Control Register

Document

5238-DS03-405-R

AUTO-NEGOTIATION LINK PARTNER (LP) NEXT PAGE TRANSMIT

Next Page. Indicates whether this is the last Next Page.

Message Page. Differentiates a message page from an unformatted page.

Acknowledge 2. Indicates that the 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 that may contain an arbitrary value.

100BASE-X AUXILIARY CONTROL REGISTER

Table 25: Next Page Transmit Register (Address 08d, 08h)

Bit

Name

R/W

Description

Default

1 = Additional Next Page(s) follows

0 = Last page

Reserveda

a. When writing to this register, preserve existing values of reserved bits by completing a Read/Modify Write.

––

Message Page

1= Message page

0 = Unformatted page

Acknowledge 2

1 = Will comply with message

0 = Cannot comply with message

Toggle

1 = Previous value of the transmitted link code word

equalled logic 0

0 = Previous value of the transmitted link code word

equalled logic 1

10:0

Message/Unformatted Code Field

–

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

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

Table 26: 100-BASE-X Auxiliary Control register (Address 16d, 10h)

Bit

Name

R/W

Description

Default

15:14

Reserveda

––

Transmit Disable

R/W

1 = Transmitter disabled in PHY

0 = Normal operation

Reserveda

––

Reserveda

––

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

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

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