5220-DS02-R datasheet(65/90 Pages) BOARDCOM

部件名	5220-DS02-R

功能描述	10/100BASE-TX/FX Mini Transceiver

PDF	90 Pages

Scroll/Zoom	100%

制造商	BOARDCOM [Broadcom Corporation.]

网页	http://www.broadcom.com

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65 / 90 page

Preliminary Data Sheet

BCM5220

04/20/04

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

Document

5220-DS04-405-R

Auxiliary Multiple PHY Register

Page 53

BROADCOM TEST REGISTER

Shadow Register Enable

Writing a 1 to bit 7 of register 1Fh allows R/W access to the shadow registers.

Table 30: Broadcom Test (Address 31d, 1Fh)

BIt

Name

R/W

Description

Default

15:8

Reserveda

Ignore when read

00h

Shadow register enable

R/W

1 = Enable shadow registers

0 = Disable shadow registers

Reserveda

Ignore when read

Reserveda

R/W

Write as 0, Ignore when read

4:0

Reserveda

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

R/W

Write as 0Bh, Ignore when read

0Bh

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).

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