5222-DS00-R datasheet(34/76 Pages) BOARDCOM

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BCM5222

Preliminary Data Sheet

7/20/04

Broadcom Corporation

Page 22

PHY Identifier Registers

Document 5222-DS02-405-R

PHY IDENTIFIER REGISTERS

The physical indentifier registers bit descriptions are shown in Table 9.

Broadcom Corporation has been issued an Organizationally Unique Identifier (OUI) by the IEEE. It is a 24-bit number, 00-

10-18, expressed as hex values. That number, along with the Broadcom Model Number for the BCM5222 part, 32h, and

Broadcom Revision number (n), is placed into two MII Registers. The translation from OUI, Model Number and Revision

Number to PHY Identifier register occurs as follows:

•

PHYID HIGH [15:0] = OUI[21:6]

•

PHY LOW [15:0] = OUI[5:0] + MODEL[5:0] + REV[3:0]

The 2 most significant bits of the OUI are not represented (OUI[23:22]).

Table 9 shows the result of concatenating these values to form MII Identifier Registers PHYID HIGH and PHYID LOW.

AUTO-NEGOTIATION ADVERTISEMENT REGISTER

Table 9: PHY Indentifier Registers (Addresses 00010 and 00011b, 02 and 03b, 02 and 03h)

Bit

Name

R/W

Description

Value

15:0

MII Address 02h

PHYID HIGH

0040h

15:0

MII Address 03h

PHYID LOW

632n (Hex)

Note: The revision number (n) changes with each silicon revision.

Table 10: Auto-Negotiation Advertisement Register (Address 04d, 04h)

Bit

Name

R/W

Description

Default

R/W

1 = Next page ability is enabled

0 = Next page ability is disabled

Reserved

Ignore when read

Remote Fault

R/W

1 = Transmit remote fault

12:11

Reserved

Ignore when read

Pause

R/W

1 = Pause operation for full-duplex

Advertise 100BASE-T4

0 = Do not advertise T4 capability

Advertise 100BASE-TX FDX

R/W

1 = Advertise 100BASE-TX full-duplex

0 = Do not advertise 100BASE-TX full-duplex

Advertise 100BASE-TX

R/W

1 = Advertise 100BASE-TX

Advertise 10BASE-T FDX

R/W

1 = Advertise 10BASE-T full-duplex

0 = Do not advertise 10BASE-T full-duplex

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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