5228-DS05-R datasheet(56/100 Pages) BOARDCOM

56 / 100 page

BCM5228

Data Sheet

7/12/04

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

Page 44

Auto-Negotiation Link Partner (LP) Ability Register

Document

5228-DS09-405-R

AUTO-NEGOTIATION LINK PARTNER (LP) ABILITY REGISTER

The values contained in the Auto-Negotiation Link Partner Ability register are only guaranteed to be valid after auto-

negotiation has successfully completed, as indicated by bit 5 of the MII Status register.

LP Next Page. Bit 15 of the Link Partner Ability register returns a value of 1 when the link partner implements the Next Page

function and has Next Page information that it wants to transmit. The BCM5228 does not implement the Next Page function,

and thus ignores the Next Page bit, except to copy it to this register.

LP Acknowledge. Bit 14 of the Link Partner Ability register is used by auto-negotiation to indicate that a device has

successfully received its link partner’s link code word.

LP Remote Fault. Bit 13 of the Link Partner Ability register returns a value of 1 when the link partner signals that a remote

fault has occurred. The BCM5228 simply copies the value to this register and does not act upon it.

Reserved Technologies. Ignore when read.

LP Advertise Pause. Indicates that the Link Partner Pause bit is set.

LP Advertise. Bits 9:5 of the Link Partner Ability register reflect the abilities of the link partner. A 1 on any of these bits

indicates that the Link Partner is capable of performing the corresponding mode of operation. Bits 9:5 are cleared any time

auto-negotiation is restarted or the BCM5228 is reset.

Link Partner Selector Field. Bits 4:0 of the Link Partner Ability register reflect the value of the link partner’s selector field.

These bits are cleared any time auto-negotiation is restarted or the chip is reset.

Table 23: Auto-Negotiation Link Partner Ability Register (Address 05d, 05h)

Bit

Name

R/W

Description

Default

LP Next Page

Link partner next page bit

LP Acknowledge

Link partner acknowledge bit

LP Remote Fault

Link partner remote fault indicator

12:11

Reserved Technologies

Ignore when read

000

LP Advertise Pause

Link partner has pause capability

LP Advertise 100BASE-T4

Link partner has 100BASE-T4 capability

LP Advertise 100BASE-X FDX

Link partner has 100BASE-X FDX capability

LP Advertise 100BASE-X

Link partner has 100BASE-X capability

LP Advertise 10BASE-T FDX

Link partner has 10BASE-T FDX capability

LP Advertise 10BASE-T

Link partner has 10BASE-T capability

4:0

Link Partner Selector Field

Link partner selector field

00000

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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