5220-DS02-R datasheet(68/90 Pages) BOARDCOM

68 / 90 page

BCM5220

Preliminary Data Sheet

04/20/04

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

Page 56

Auxiliary Status 3 Register (Shadow Register)

Document

5220-DS04-405-R

AUXILIARY STATUS 3 REGISTER (SHADOW REGISTER)

Noise [7:0]

The BCM5220 provides the current mean squared error value for noise when a valid link is established.

FIFO Consumption [3:0]

The BCM5220 indicates the number of nibbles of FIFO currently used.

AUXILIARY MODE 3 REGISTER (SHADOW REGISTER)

Table 33: Auxiliary Status 3 Register (Shadow Register 28d, 1Ch)

BIt

Name

R/W

DESCRIPTION

Default

15:4

Reserveda

a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”

R/W

Write as 000h, ignore when read

000h

3:0

FIFO Consumption [3:0]

R/O

Currently utilized number of nibbles in the receive

FIFO

0000

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

Table 34: Auxiliary Mode 3 Register (Shadow Register 29d, 1Dh)

BIt

Name

R/W

Description

Default

15:9

Reserveda

R/W

Write as 00h, ignore when read

Reserveda

R/W

Write as 0, ignore when read

Reserveda

R/W

Write as 0, ignore when read

Reserveda

R/W

Write as 0, ignore when read

5:4

Reserveda

a. Preserve existing values of reserved bits by completing a “Read/Modify Write.”

R/W

Write as 00, ignore when read

3:0

FIFO Size Select [3:0]

R/W

Currently selected receive FIFO Size

Notes: 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.

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