VSC8504-02 datasheet(38/131 Pages) MICROSEMI

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Functional Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

3.13.2

Extended LED Modes

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

LED0_[3:0] pins whenever the corresponding register 19E1, bits 15 to 12 are set to 1. Each of these bits

enables extended modes on a specific LED pin and these extended modes are shown in the following

table. For example, LED0 = mode 17 means that register 19E1 bit 12 = 1 and register 29 bits 3 to

0 = 0001.

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

3.13.3

LED Behavior

Several LED behaviors can be programmed into the VSC8504-02. Use the settings in register 30 and

19E1 to program LED behavior, which includes the following.

3.13.3.1 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

activity is either transmitted by the PHY or received by the Link Partner. When disabled, the combine

feature only provides status of the selected primary function. In this example, only Link1000 asserts the

LED, and the secondary mode, activity, does not display when the combine feature is disabled.

3.13.3.2 LED Blink or Pulse-Stretch

This behavior is used for activity and collision indication. This can be uniquely configured for each LED

pin. Activity and collision events can occur randomly and intermittently throughout the link-up period.

Autonegotiation Fault

1: No autonegotiation fault present.

0: Autonegotiation fault occurred.

Serial Mode

Serial stream. See Basic Serial LED Mode, page 28. Only

relevant on PHY port 0 and reserved in others.

Force LED Off

1: De-asserts the LED(1).

Force LED On

0: Asserts the LED(1).

Setting this mode suppresses LED blinking after reset.

Table 8 •

Extended LED Mode and Function Summary

Mode Function Name

LED State and Description

Link1000BASE-X Activity 1: No link in 1000BASE-X.

0: Valid 1000BASE-X link.

Link100BASE-FX Activity 1: No link in 100BASE-FX.

0: Valid 100BASE-FX link.

1000BASE-X Activity

1: No 1000BASE-X activity present.

Blink or pulse-stretch = 1000BASE-X activity present.

100BASE-FX Activity

1: No 100BASE-FX activity present.

Blink or pulse-stretch = 100BASE-FX activity present.

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

1: Enable fast link fail on the LED pin

0: Disable

Table 7 •

LED Mode and Function Summary (continued)

Mode Function Name

LED State and Description

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