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Advanced 10/100 Repeater with Integrated Management — LXT9860/9880

Datasheet

Document #: 248987

Revision#: 003

Rev Date: 08/07/01

3.7

LED Operation

The LXT98x0 drives the most commonly used LEDs directly (see “Direct Drive LEDs” on

page 42). The less frequently used LEDs are optionally driven via a serial bus to inexpensive

Serial-to-Parallel devices (see “Serial LEDs” on this page).

3.7.1

LEDs at Start-up

For approximately 2 seconds after the LXT98x0 is reset, all LEDs are driven to the ON state. This

start-up routine is an LED check.

3.7.2

LED Event Stretching

Short lived LED status events are stretched so they may be observed by the human eye. Refer to the

LED1, 2, 3 Modes section for stretching specifics.

3.7.3

LED Blink Rates

Two programmable blink rates are provided. The default period for the slow blink rate is 1.6s. The

default period is 0.4s for the fast blink rate. These rates may be changed via the LED Timer Control

lower 8 bits of the LED Timer Control Register. Refer to “LED Timer Control Register” on

page 112 for details.

100 Mbps IRB

10 Mbps IRB

IR100CFS

IR10DAT

IR100CFSBP

IR10ENA

IR100DV

IR10COL

IR100CLK

IR10CFS

IR10COLBP

IR10CFSBP

Figure 5. LED Blink Rates

Time

On Solid

Slow Blink

Fast Blink

Off

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