Intel SC5650BCDP Manual Do Utilizador

 

The BIOS executes platform configuration processes during the system boot. Each process is 
assigned a specific hex POST code number. As each configuration routine is started, the BIOS 
displays the POST code on the POST Code Diagnostic LEDs on the back edge of the server 
board. The Diagnostic LEDs identify the last POST process to be executed. 

Each POST code is represented by the eight amber Diagnostic LEDs. The POST codes are 
divided into two nibbles: an upper nibble and a lower nibble. The upper nibble bits are 
represented by Diagnostic LEDs #4, #5, #6, and #7. The lower nibble bits are represented by 
Diagnostics LEDs #0, #1, #2, and #3. Given the bit is set in the upper and lower nibbles, and 
then the corresponding LED is lit. If the bit is clear, corresponding LED is off. 

Diagnostic LED #7 is labeled as “MSB” and the Diagnostic LED #0 is labeled as “LSB”.  

 

 

A. ID LED 

F. Diagnostic LED #4 

B. Status LED 

G. Diagnostic LED #3 

C. Diagnostic LED #7 (MSB LED) 

H. Diagnostic LED #2 

D. Diagnostic LED #6 

I. Diagnostic LED #1 

E. Diagnostic LED #5 

J. Diagnostic LED #0 (LSB LED) 

In the following example, the BIOS sends a value of ACh to the diagnostic LED decoder. The 
LEDs are decoded as follows: 

ON OFF ON OFF ON  ON OFF OFF 

1 0 1 0 1 1 0 0 

Upper nibble bits = 1010b = Ah; Lower nibble bits = 1100b = Ch; the two are concatenated as 
ACh.