Functional Description CP308
Page 2 - 10 ID 1027-4487, Rev. 3.0
P R E L I M I N A R Y
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
FUNCTION
DURING BOOT-UP
FUNCTION AFTER BOOT-UP
WD LED green The WD LED is not
lit during boot-up.
Watchdog Status
The WD LED states are:
• Off: Watchdog inactive
• Green: Watchdog active, waiting to be triggered
TH LED green The TH LED is not lit
during boot-up.
Temperature Status
The TH LED states are:
• Off: If the CPU junction temperature is below 105°C
• Green: In case of overtemperature of the CPU (105°C
junction temperature)
• Green blinks: If a Thermtrip event occurred on the CPU or the
GS45 GMCH
In this event, all General Purpose LEDs
(LED3..LED0) are lit red.
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