Board Interfaces; Front Panel Leds; Watchdog And Temperature Status Leds; Watchdog Status Led And Temperature Status Led Function - Kontron CP308 User Manual

Functional Description
2.3

Board Interfaces

2.3.1

Front Panel LEDs

The CP308 is equipped with one Watchdog Status LED (WD LED), one Temperature Status
LED (TH LED), four General Purpose/POST code LEDs (LED 0..3), and one SMC LED. Their
functionality is described in the following chapters and reflected in the registers mentioned in
Chapter 4, Configuration.
2.3.1.1

Watchdog and Temperature Status LEDs

The CP308 provides one Watchdog Status LED (WD LED) and one Temperature Status LED
(TH LED).
Note ...
If the TH LED flashes at regular intervals, it indicates that the processor junction
temperature or the GS45 GMCH junction temperature has reached a level
beyond which permanent silicon damage may occur. Upon assertion of Ther-
mtrip, the respective device will shut off its 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 CP308 is
undertaken (all power off and then on again).
Table 2-5:

Watchdog Status LED and Temperature Status LED Function

LED COLOR
DURING BOOT-UP
WD LED green The WD LED is not
lit during boot-up.
TH LED green The TH LED is not lit
during boot-up.
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FUNCTION
Watchdog Status
The WD LED states are:
•
Off:
•
Green:
Temperature Status
The TH LED states are:
•
Off:
•
Green:
•
Green blinks: If a Thermtrip event occurred on the CPU or the
FUNCTION AFTER BOOT-UP
Watchdog inactive
Watchdog active, waiting to be triggered
If the CPU junction temperature is below 105°C
In case of overtemperature of the CPU (105°C
junction temperature)
GS45 GMCH
In this event, all General Purpose LEDs
(LED3..LED0) are lit red.
CP308
ID 1027-4487, Rev. 3.0