5228-DS04-R datasheet(54/100 Pages) BOARDCOM

54 / 100 page

BCM5228

Data Sheet

7/12/04

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

Page 42

PHY Identifier Registers

Document

5228-DS09-405-R

Auto-Negotiation Complete. Bit 5 of the Status register returns a 1 if the auto-negotiation process has been completed and

the contents of registers 4, 5 and 6 are valid.

Remote Fault. The PHY returns a 1 in bit 4 of the Status register when its link partner has signalled a far-end fault condition.

When a far-end fault occurs, the bit is latched at 1 and remains so until the register is read and the remote fault condition

has been cleared. This only applies to the FX mode of operation.

Auto-Negotiation Capability. The BCM5228 is capable of performing IEEE auto-negotiation, and returns a 1 when bit 4 of

the Status register is read, regardless of whether or not the auto-negotiation function has been disabled.

Link Status. The BCM5228 returns a 1 on bit 2 of the Status register when the link state machine is in Link Pass, indicating

that a valid link has been established. Otherwise, it returns 0. When a link failure occurs after the Link Pass state has been

entered, the Link Status bit is latched at 0 and remains so until the bit is read. After the bit is read, it becomes 1 if the Link

Pass state has been entered again.

Jabber Detect. 10BASE-T operation only. The BCM5228 returns a 1 on bit 1 of the Status register if a jabber condition has

been detected. After the bit is read, or if the chip is reset, it reverts to 0.

Extended Capability. The BCM5228 supports extended capability registers, and returns a 1 when bit 0 of the Status register

is read. Several extended registers have been implemented in the BCM5228, and their bit functions are defined later in this

section.

PHY IDENTIFIER REGISTERS

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 (the two most significant bits (OUI[23:22]) of the OUI are not represented). That number,

along with the Broadcom Model Number for the BCM5228 part, 1Ch, and Broadcom Revision number, 00h, 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]

PHYID Low[15:0] = OUI[5:0] + Model[5:0] + Rev[3:0]

Figure 21 on page 42 shows the result of concatenating these values to form the MII Identifier registers PHYID HIGH and

PHYID LOW.

Table 21: PHY Identifier Registers (Addresses 02d and 03d, 02h and 03h)

Bit

Name

R/W

Description

Value

15:0

MII Address 00010

PHYID high

0040h

15:0

MII Address 00011

PHYID low

XXXXh

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