VSC8221 datasheet(41/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

41 of 43

13 LED INTERFACE

The PHY has dedicated pins LED[2:0] to drive 3 LEDs directly. For power savings, all LED outputs can be configured to pulse at

5kHz with a 20% duty cycle. All LED outputs are active-low and driven with 3.3V from the VDD33A power supply when

deasserted.

Because the 100BASE-FX mode uses 100BASE-T resources, its indications are those of the 100BASE-T mode.

Four different functions have been assigned to each LED pin. Selection is done through CMODE hardware configuration (see

Section 18 on page 53) or through Mii Register 27 (1Bh) – LED Control Register. The functions are assigned according to the

following table:

LED functions are summarized in the following table:

Table 20. LED Function Assignments

LED Configuration Bits

Value

LED Function Selection

LED Pin 2 Config [1:0]

TX1

1 When using Enable Force LED in Mii Register 20E.13, this setting is “Force on”. For more information, see Section 23.3.5 on page 100.

Link/Activity

Duplex/Collision2

2 When using Enable Force LED in Mii Register 20E.13, this setting is “Force Off”. For more information, see Section 23.3.5 on page 100.

Link10/Activity

LED Pin 1 Config [1:0]

Link100/1000/Activity1

Link/Activity

Link10/100/Activity2

Link100/Activity

LED Pin 0 Config [1:0]

RX1

Fault

Link/Act (with serial output on LED pins 1 and 2)2

Link1000/Activity

Table 21. Parallel LED Functions

Function Name

State

Description

Link1000/Activity1

No link in 1000BASE-T or 1000BASE-X

Valid 1000BASE-T link or 1000BASE-X link

Pulse-stretch/Blink2

Valid 1000BASE-T link and activity present (optional)

Link100/Activity1

No link in 100BASE-Tx

Valid 100BASE-Tx link

Pulse-stretch/Blink2

(optional) Valid 100BASE-Tx link and activity present

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