Functional Description CP308
Page 2 - 12 ID 1027-4487, Rev. 3.0
P R E L I M I N A R Y
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 2-6, “General Purpose LED Function”).
2.3.2 SMC LED
The CP308 provides one bicolor SMC LED (red/green) designed to display the status of the
system management controller. The SMC LED is directly connected to the NXP LPC2136 SMC
controller.
2.3.3 DIP Switch SW1
The CP308 is equipped with one 4-bit DIP switch, SW1, used for board configuration.
For further information on the configuration of the DIP switch, refer to section 4.1, “DIP Switch
Configuration”.
Table 2-7: POST Code Sequence
STATE GENERAL PURPOSE LEDs
0 All LEDs are OFF; start of sequence
1 High nibble
2 Low nibble
Table 2-8: 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 only for debugging purpos-
es. In the event that a General Purpose LED lights up during boot-up and the
CP308 does not boot, please contact Kontron for further assistance.
Table 2-9: DIP Switch SW1 Function
SWITCH FUNCTION
1 SPI Flash boot configuration
2 Clear uEFI BIOS settings
3 Reserved
4 PCB Index 01: Reset configuration
PCB Index 00: Reserved
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