VSC8541-02 datasheet(31/101 Pages) MICROCHIP

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Functional Descriptions

VMDS-10513 VSC8541-02 Datasheet Revision 4.1

serial LED mode is enabled, the LED0 pin becomes the serial data pin, and the LED1 pin becomes the

serial clock pin. The serial LED mode clocks the LED status bits on the rising edge of the serial clock.

The LED behavior settings can also be used in serial LED mode. The LED combine and LED blink or

pulse-stretch setting of LED0 is used to control the behavior of each bit of the serial LED stream. To

configure LED behavior, set device register 30.

The following table shows the serial output bitstream of each LED signal.

3.11.3

Extended LED Modes

In addition to the LED modes in register 29, there are also additional LED modes that are enabled on the

LED pin whenever the corresponding register 19E1, bits 13 to 12 are set to 1. Each of these bits enable

an extended mode shown in the following table. For example, LED0 = mode 22 means that register 19E1

bit 12 = 1 and register 29 bits 3 to 0 = 0110.

The following table provides a summary of the extended LED modes and functions.

3.11.4

LED Behavior

Several LED behaviors can be programmed into the VSC8541-02 device. Use the settings in register 30

and 19E1 to program LED behavior, as described in the following sections.

3.11.4.1 LED Combine

Enables an LED to display the status for a combination of primary and secondary modes. This can be

enabled or disabled for each LED pin. For example, a copper link running in 1000BASE-T mode and

activity present can be displayed with one LED by configuring an LED pin to Link1000/Activity mode. The

LED asserts when linked to a 1000BASE-T partner and also blinks or performs pulse-stretch when

Table 15 •

LED Serial Bitstream Order

Output

Link/activity

Link1000/activity

Link100/activity

Link10/activity

Reserved

Duplex/collision

Collision

Activity

Reserved

Tx activity

Rx activity

Autonegotiation fault 12

Table 16 •

Extended LED Mode and Function Summary

Mode Function Name LED State and Description

16-19 Reserved

Reserved.

Force LED Off

1: De-asserts the LED.

Force LED On

0: Asserts the LED. LED pulsing is disabled in this mode.

Fast Link Fail

Enable fast link fail on the LED pin.

WoL interrupt

Enable WoL interrupt indication on the LED pin.

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