5222-DS02-R datasheet(57/76 Pages) BOARDCOM

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Preliminary Data Sheet

BCM5222

7/20/04

Broadcom Corporation

Document 5222-DS02-405-R

Auxiliary Status 3 Register (Shadow Register)

Page 45

AUXILIARY STATUS 3 REGISTER (SHADOW REGISTER)

NOISE [7:0]

The BCM5222 provides the current mean squared error value for noise when a valid link is established.

FIFO CONSUMPTION [3:0]

The BCM5222 indicates the number of nibbles of FIFO currently used.

AUXILIARY MODE 3 REGISTER (SHADOW REGISTER)

FIFO SIZE SELECT [3:0]

The BCM5222 indicates the current selection of receive FIFO size using bit 3 through 0 as shown in Table 32.

Table 30: Auxiliary Status 3 Register (Shadow Register 28d, 1Ch)

BIt

Name

R/W

Description

Default

15:8

Noise [7:0]

R/O

Current mean square error value, valid only if link is

established

00h

7:4

Reserved

R/W

Write as 0, ignore when read

3:0

FIFO Consumption [3:0]

R/O

Currently utilized number of nibbles in the receive

FIFO

0000

Note: MII Shadow register bank 1 is accessed by setting MII register 1Fh bit 7 to a 1

Table 31: Auxiliary Mode 3 Register (Shadow Register 29d, 1Dh)

BIt

Name

R/W

Description

Default

15:4

Reserved

R/W

Write as 00h, ignore when read

000h

3:0

FIFO Size Select [3:0]

R/W

Currently selected receive FIFO Size

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). MII Shadow register bank 1 is

accessed by setting MII register 1Fh bit 7 to a 1.

Table 32: Current Receive FIFO Size

FIFO Size Select [3:0]

Receive FIFO Size in Use

(# of Bits)

0001

0010

0011

0100

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