5220-DS02-R datasheet(62/90 Pages) BOARDCOM

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BCM5220

Preliminary Data Sheet

04/20/04

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

Page 50

Auxiliary Mode Register

Document

5220-DS04-405-R

When bit 2 of the Auxiliary Control register is 0, the speed of the chip is 10BASE-T. In all other cases, either the speed is

not forced (auto-negotiation is enabled), or the speed is forced to 100BASE-X.

Speed Indication

This read-only bit shows the true current operation speed of the BCM5220. A 1 bit indicates 100BASE-X operation, while a

0 indicates 10BASE-T. While the auto-negotiation exchange is performed, the BCM5220 is always operating at 10BASE-T

speed.

Full-Duplex Indication

This read-only bit returns a 1 when the BCM5220 is in full-duplex mode. In all other modes, it returns a 0.

AUXILIARY MODE REGISTER

Table 28 shows the bit descriptions for the Auxiliary Mode register.

Activity LED Disable

When set to 1, disables the XMTLED# and RCVLED# output pins. When 0, XMTLED# and RCVLED# output pins are

enabled.

Link LED Disable

When set to 1, disables the Link LED output pin. When 0, Link LED output is enabled.

Table 28: Auxiliary Mode Register (Address 29d, 1Dh)

Bit

Name

R/W

Description

Default

15:13

Reserveda

Ignore when read

Alternative Link LED Mode

R/W

1 = LNKLED# indicates link at 100Base-TX,

SPDLED# indicates link at 10BASE-T.

0 = Normal operation for LNKLED# and SPDLED#.

11:5

Reserveda

Ignore when read

Activity LED Disable

R/W

1 = Disable XMT/RCV activity LED outputs

0 = Enable XMT/RCV activity LED outputs

Link LED Disable

R/W

1 = Disable link LED output

0 = Enable link LED output

Reserveda

Ignore when read

Block TXEN Mode

R/W

1 = Enable block TXEN mode

0 = Disable block TXEN mode

Reserveda

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

Ignore when read

5220-DS02-R Datasheet(PDF) 62 Page - Broadcom Corporation.

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