5222-DS00-R datasheet(46/76 Pages) BOARDCOM

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BCM5222

Preliminary Data Sheet

7/20/04

Broadcom Corporation

Page 34

Auxiliary Status Summary Register

Document 5222-DS02-405-R

When bit 2 of the Auxiliary Control register (18h) is 0, the speed of the chip is 10BASE-T. In all other cases, either the speed

is not forced (auto-negotiation is enabled), or the speed is forced to 100BASE-TX.

SPEED INDICATION

This read-only bit shows the true current operation speed of the BCM5222. A 1 indicates 100BASE-TX operation, and a 0

indicates 10BASE-T. While the auto-negotiation exchange is performed, the BCM5222 is always operating at 10BASE-T

speed.

FULL-DUPLEX INDICATION

This read-only bit returns a 1 when the BCM5222 is in full-duplex mode. In all other modes, it returns a 0.

AUXILIARY STATUS SUMMARY REGISTER

The Auxiliary Status Summary register contains copies of redundant status bits found elsewhere within the MII register

space. Descriptions for each of these individual bits can be found associated with their primary register descriptions.

Table 20 indicates the bits found in this register.

Table 20: Auxiliary Status Summary Register (Address 11001b, 25d, 19h)

Bit

Name

R/W

Description

Default

Auto-Negotiation Complete

1 = Auto-negotiation process completed

Auto-Negotiation Complete

Acknowledge

1 = Auto-negotiation completed acknowledge state

Auto-Negotiation

Acknowledge Detected

1 = Auto-negotiation acknowledge detected

Auto-Negotiation Ability

Detect

1 = Auto-negotiation for link partner ability

Auto-Negotiation Pause

BCM5222 and link partner pause operation bit

10:8

Auto-Negotiation HCD

000 = No highest common denominator

001 = 10BASE-T

010 = 10BASE-T Full-Duplex

011 = 100BASE-TX

100 = 100BASE-T4

101 = 100BASE-TX Full-Duplex

11x = Undefined

000

Auto-Negotiation Parallel

Detection Fault

1 = Parallel detection fault

Link Partner Remote Fault

1 = Link partner remote fault

Link Partner Page Received

1 = New page has been received

Link Partner Auto-

Negotiation Able

1 = Link partner is auto-negotiation capable

Speed Indicator

1 = 100 Mbps

0 = 10 Mbps

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