5220-DS02-R datasheet(27/90 Pages) BOARDCOM

27 / 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

Special LED Modes

Page 15

The 10BASE-T serial mode is enabled by writing a 1 to bit 1 of the Auxiliary Multiple-PHY register (1Eh). This mode is not

available in 100BASE-X modes. The following table shows the MII pins used in this mode and their direction of operation.

SPECIAL LED MODES

Traffic Meter Mode

The blink rate of XMTLED# and RCVLED# is decreased dramatically to better show the volume of traffic. Lower traffic levels

make the corresponding LED appear dimmer than higher traffic levels. This mode is activated by writing a 1 to bit 6 of the

Aux Mode 2 register (1Bh).

Force LEDs On

The SPDLED#, LNKLED#, XMTLED#, RCVLED#, COL_LED#, ACT_LED#, and FDX_LED# outputs can be forced on (0

value) by writing a 01 to bit 5 and 4 of shadow register 1Ah.

Disable LEDs

The SPDLED#, LNKLED#, XMTLED#, RCVLED#, COL_LED#, ACT_LED#, and FDX_LED# outputs can be forced off (1

value) by writing a 10 to bit 5 and 4 of shadow register 1Ah.

Separate 100BASE-TX and 10-BASE-T Link

When bit 12 of register 1Dh is set to 1, LNKLED# indicates the link at 100BASE-TX and SPDLED# indicates the link at

10BASE-T.

Table 4: 10BASE-T Serial Mode (7-Wire) Signals

5220 KPT

Pin Label

Type

Description

TXD (0)

Serial Transmit Data

TXC

Transmit Data Clock (10 MHz)

TXEN

Transmit Enable

RXD (0)

Serial Receive Data

RXC

Receive Data Clock (10 MHz)

CRS

Carrier Sense

COL/RXEN

Collision Detect

5220-DS02-R Datasheet(PDF) 27 Page - Broadcom Corporation.

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