Functional Description
CP6003-SA
Page 2 - 10
ID 1044-9757, Rev. 2.0
P R E L I M I N A R Y
For further information regarding the configuration of the General Purpose LEDs, refer to Chap-
ter 4.4.14, LED Configuration Register, and Chapter 4.4.15, LED Control Register.
How to Read the 8-Bit POST Code
Due to the fact that only 4 bits are available and 8 bits must be displayed, the POST code output
is multiplexed on the General Purpose LEDs.
The following is an example of the General Purpose LEDs’ operation if the POST configuration
is enabled (see also Table 2-4, “General Purpose LED Function”).
Table 2-3:
POST Code
Sequence
STATE
GENERAL PURPOSE LEDs
0
All LEDs are OFF; start of sequence
1
High nibble
2
Low nibble
Table 2-4:
POST Code Example
LED3
LED2
LED1
LED0
RESULT
HIGH NIBBLE
off (0)
on (1)
off (0)
off (0)
0x4
LOW NIBBLE
off (0)
off (0)
off (0)
on (1)
0x1
POST CODE
0x41
Note ...
Under normal operating conditions, the General Purpose LEDs should not re-
main lit during boot-up. They are intended to be used for debugging purposes.
In the event that a General Purpose LED lights up during boot-up and the
CP6003-SA does not boot, please contact Kontron for further assistance.
