VSC8658 datasheet(27/95 Pages) MICROSEMI

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Functional Descriptions

VMDS-10242 VSC8658 Datasheet Revision 4.1

4.14.2

LED Behavior

Several LED behaviors can be programmed into the VSC8658 device. Use the settings in register 30 to

program LED behavior, which includes the following:

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 if the

combine feature is disabled.

Link100/1000/Activity

1 = No link in 100BASE-TX or 1000BASE-T.

0 = Valid 100BASE-TX or 1000BASE-T link.

Blink or pulse-stretch = Valid 100BASE-TX or 1000BASE-T link with activity

present.

Link10/1000/Activity

1 = No link in 10BASE-T or 1000BASE-T.

0 = Valid 10BASE-T or 1000BASET-T link.

Blink or pulse-stretch = Valid 10BASE-T or 1000BASE-T link with activity

present.

Link10/100/Activity

1 = No link in 10BASE-T or 100BASE-TX.

0 = Valid 10BASE-T or 100BASE-TX link.

Blink or pulse-stretch = Valid 10BASE-T or 100BASE-TX link with activity

present.

Link100BASE-FX/

1000BASE-X/Activity

1 = No link in 100BASE-FX or 1000BASE-X.

0 = Valid 100BASE-FX or 1000BASE-X link.

Blink or pulse-stretch = Valid 100BASE-FX or 1000BASE-X link with activity

present.

Duplex/Collision

1 = Link established in half-duplex mode, or no link established.

0 = Link established in full-duplex mode.

Blink or pulse-stretch = Link established in half-duplex mode but collisions are

present.

Collision

1 = No collision detected.

Blink or pulse-stretch = Collision detected.

Activity

1 = No activity present.

Blink or pulse-stretch = Activity present (becomes TX activity present if register

bit 30.14 is set to 1).

100BASE-FX/

1000BASE-X Fiber

Activity

1 = No 100BASE-FX or 1000BASE-X activity present.

Blink or pulse-stretch = 100BASE-FX or 1000BASE-X activity present (becomes

RX activity present if register bit 30.14 is set to 1).

Auto-Negotiation Fault 1 = No auto-negotiation fault present.

0 = Auto-negotiation fault occurred.

Serial Mode

Serial stream = See Serial LED Mode, page 20. Only relevant on PHY port 0 and

reserved in others.

Force LED Off

1 = De-asserts the LED.

Force LED On

0 = Asserts the LED.

Link/Activity can be configured to only display copper link and disable fiber link status by setting register bits 30.15 to 1.

Table 5 •

LED Mode and Function Summary (continued)

Mode

Function Name

LED State and Description

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