Intel 82540EP/EM Benutzerhandbuch

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This EEPROM word specifies the hardware defaults for the LEDCTL register fields controlling the 
LED0/(LINK_UP#) and LED2/LINK100 output behaviors. Refer to 

 for the LED 

Control bit descriptions and 

 for the Mode Encodings.

A value of 0602h is used to configure default hardware LED behavior equivalent to 82544-based 
Copper adapters (LED0/LINK_UP#, LED1/ACTIVITY# (blinking), LED2/LINK100#, and 
LED3/LINK1000#).

The boot agent software configuration is controlled by the EEPROM with the main setup options 
stored in word 30h. These options are those that can be changed by using the Control-S setup menu 
or by using the IBA Intel Boot Agent utility.

The 82541ER does not support the Intel Boot Agent functionality.

1.

Not applicable to the 82544GC/EI.

3:0

LED0 Mode

Initial value of the LED0_MODE field specifying what event/state/
pattern will be displayed on LED0 (LINK_UP) output. A value of 
0010 (0x2) causes this to indicate LINK_UP state.

5:4

Reserved

Reserved. 

Set as 0b.

6

LED0  Invert

Initial value of LED0_IVRT field.

0b = Active-low output.

7

LED0 Blink

Initial value of LED0_BLINK field. 

0b = Non-blinking.

11:8

LED2 Mode

Initial value of the LED2_MODE field specifying what event/state/
pattern will be displayed on LED2 (LINK_100) output. A value of 
0110b (0x6) causes this to indicate 100 Mb/s operation.

13:12

Reserved

Reserved. Set as 0b.

14

LED2 Invert

Initial value of LED2_IVRT field. 

0b = Active-low output.

15

LED2 Blink

Initial value of.LED2_BLINK field. 

0b = Non-blinking