Functional Description
CP307
Page 2 - 12
ID 34424, Rev. 3.0
P R E L I M I N A R Y
2.3
Board Interfaces
2.3.1
General Purpose LED Output
The CP307 provides two software programmable GP LEDs. After reset the default
configuration for the two front LEDs is Overtemperature and Watchdog status. Additionally, if
the WD LED remains on during power-on, it indicates a PCI reset is active, and if the TH LED
remains on during power-on, it indicates a power failure. In this case, please check the power
supply. If the power supply appears to be functional and the LED remains on, please contact
Kontron.
If the WD/GP LED and the TH/GP LED keep flashing during BIOS initialization, a POST code
is indicated. For information on the POST Codes, refer to the CP307 BIOS Guide, Chapter 10,
POST Codes.
The following table defines the blinking intervals of the WD/GP LED and the TH/GP LED.
For example, if the WD/GP LED blinks 13 times and the TH/GP LED blinks 5 times, the POST
code is 0xD5.
Furthermore, the WD/GP LED and the TH/GP LED can be configured via two onboard regis-
ters. For further information refer to Chapter 4
Configuration.
The LED control logic remains in the same state until the next system reset.
Table 2-8: POST Code Indication
LED
NUMBER OF BLINKS
WD/GP LED
high-order nibble (bits 4-7) of POST code
TH/GP LED
low-order nibble (bits 0-3) of POST code
Note ...
If the TH/GP LED (overtemperature LED) flashes at regular intervals, it indi-
cates that the processor or the 945GM Express GMCH junction temperature
has reached a level beyond which permanent silicon damage may occur. Upon
assertion of Thermtrip, the devices will shut off their internal clocks (thus halting
program execution) in an attempt to reduce the junction temperature.
Once activated, Thermtrip remains latched until a cold restart of the CP307 is
undertaken (all power off and then on again).
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