VSC8221 datasheet(43/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

43 of 43

in addition to function selection, several options are available for the LED outputs through the use of Mii register 27.5:0. These

are summarized below:

13.1 Serial LED Output

A serial output option is available which allows access to all LED signals through two pins. This option is selected by setting

LED Pin 0 configuration bits to 01 on the PHY. in this mode, LED pins 1 and 2 function as serial data and clock. LED function

outputs for the PHY are clocked out on the rising edge of data clock. The clock rate is approximately 1MHz.

The serial bitstream outputs each LED signal as described by the numbered list below.The individual signals shall be clocked

out in the following order:

Link1000/Act

Link/Act

Link100/Act

Act

Link10/Act

Dup/Col

Col

10. Fault

11. Fiber/Copper

Table 22. LED Output Options

Mii

Reg Bits

LED Option Bits

LED Function Selection

LED Pulse-stretch Rate/ Blink Rate

0 = 5 Hz blink rate/200 ms pulse-stretch

1 = 10 Hz blink rate/100 ms pulse-stretch

LED Pulsing Enable

1 = Enable 5 kHz, 20% duty cycle LED pulsing for power

savings

0 = LED pulsing disabled

LED Pulse-Stretch / Blink Select

1 = Collision, Activity, Rx and Tx functions will flash at a rate

selected by Blink/Pulse-Stretch Rate bits

0 = Collision, Activity, Rx and Tx functions will blink at a rate

selected by Blink/Pulse-Stretch Rate bits

Link/Activity Behaviour

1 = Link function indicates link status only

0 = Link/Activity function will blink or flash when activity is pres-

ent. Blink/flash behavior is selected by Pulse-Stretch

Enable and Blink/Pulse-Stretch Rate bits.

LED Linkxxxx/Activity1 Behavior

1 Linkxxxx/Activity stands for Link10/Activity,Link100/Activity,Link1000/Activity,Link10/100/Activity and Link100/1000/Activity. its

definition does not include the Link/Activity function.

1 = Link function indicates link status only

0 = All link functions will blink or flash when activity is present.

Blink/flash behavior is selected by Pulse-Stretch Enable

and Blink/Pulse-Stretch Rate bits.

LED Duplex/Collision Behavior

1 = Duplex function indicates duplex status only

0 = Duplex function will blink or flash when collision is present

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