Preliminary Data Sheet

12/11/01

B roa dcom Co rpo rat ion

Document

AC104X-DS00-405-R

Section 3 : R egis ter De scr iptions

The first seven registers of the MII register set are defined by the MII specification. In addition to these required registers are

several Altima Communications Inc. specific registers. There are reserved registers and/or bits that are for Altima internal

use only. The following standard registers are supported. Register numbers are in decimal format; the values are in hex

format.

When writing to registers it is recommended that a read/modify/write operation be performed, as unintended bits may get to

unwanted states. This applies to all registers, including those with reserved bits.

RW

Read and Write Access

SC

Self Clearing

LL

Latch Low until cleared by reading

RO

Read Only

RC

Cleared on Read

LH

Latch High until cleared by reading

Table 10:

Registers 0-7

Register

Description

Default

0

Control Register

3000

1

Status Register

7849

2

PHY Identifier 1 Register

0022

3

PHY Identifier 2 Register

5542

4

Auto-Negotiation Advertisement Register

01E1

5

Auto-Negotiation Link Partner Ability Register

0001

6

Auto-Negotiation Expansion Register

0004

7

Next Page Advertisement Register

2001