Functional Description
CP6003-SA
Page 2 - 8
ID 1044-9757, Rev. 2.0
P R E L I M I N A R Y
2.10.1.2
Watchdog and Temperature Status LEDs
The CP6003-SA provides one Watchdog Status LED (WD LED) and one Temperature Status
LED (TH LED).
Note ...
If the TH LED flashes red at regular intervals, it indicates that the processor
junction temperature has reached a level beyond which permanent silicon dam-
age may occur. Upon assertion of THERMTRIP#, the processor will shut off its
internal clocks (thus halting program execution) in an attempt to reduce the pro-
cessor junction temperature.
Once activated, THERMTRIP# remains latched until a cold restart of the
CP6003-SA is undertaken (all power off and then on again).
Table 2-1:
Watchdog and Temperature Status LEDs Function
LED
COLOR
FUNCTION
DURING BOOT-UP
FUNCTION AFTER BOOT-UP
WD LED
red /
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
•
Red:
Watchdog expired
TH LED
red /
green
The TH LED is lit
green during boot-
up.
Temperature Status
The TH LED states are:
•
Off:
Power failure
•
Green:
If the CPU temperature is below 100°C
•
Red:
In case of overtemperature of the CPU, i.e. the CPU
has reached a temperature above 100°C
•
Red blinks: If the CPU has been shut off, i.e. the CPU has
reached a temperature above 125°C. In this event,
all General Purpose LEDs (LED3..LED0) are blinking
red as well.
