5222-DS02-R datasheet(56/76 Pages) BOARDCOM

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BCM5222

Preliminary Data Sheet

7/20/04

Broadcom Corporation

Page 44

Auxiliary Status 2 Register (Shadow Register)

Document 5222-DS02-405-R

AUXILIARY STATUS 2 REGISTER (SHADOW REGISTER)

MLT3 DETECTED

The BCM5222 returns a 1 in this bit whenever MLT3 signaling is detected.

CABLE LENGTH 100X [2:0]

The BCM5222 provides the cable length for each port when a 100TX link is established.

ADC PEAK AMPLITUDE [5:0]

The BCM5222 returns the AD converter’s 6-bit peak amplitude seen during this link.

Table 28: Auxiliary Status 2 Register (Shadow Register 27d, 1Bh)

BIt

Name

R/W

Description

Default

MLT3 Detected

R/O

1 = MLT3 Detected

14:12

Cable Length 100X [2:0]

R/O

The BCM5222 shows the cable length in 20 meters

increment as shown in the table below

000

11:6

ADC Peak Amplitude [5:0]

R/O

A to D peak amplitude seen

00h

5:0

Reserved

R/W

Write as 0, Ignore when read

01h

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 29: Cable Length

Cable Length 100x [2:0]

Cable Length in Meters

000

< 20

001

20 to <40

010

40 to <60

011

60 to < 80

100

80 to < 100

101

100 to < 120

110

120 to < 140

111

> 140

5222-DS02-R 数据表(PDF) 56 Page - Broadcom Corporation.

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