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BIOS setup program will automatically enable Native mode as Native mode is a subset
of Enhanced mode. See section 9.4.8 for more information about this. Running in native
mode frees up interrupt resources (IRQs 14 and 15) and decreases the chance that
there may be a shortage of interrupts when installing devices.
Note
If your operating system supports native mode then congatec AG recommends you
enable it.
6.3 Thermal Monitor and Catastrophic Thermal Protection
Intel
®
Atom™, Core™ 2 Duo, Core™ Duo and Celeron M processors have a thermal
monitor feature that helps to control the processor temperature. The integrated TCC
(Thermal Control Circuit) activates if the processor silicon reaches its maximum
operating temperature. The activation temperature, that the Intel Thermal Monitor uses
to activate the TCC, cannot be configured by the user nor is it software visible.
The Thermal Monitor can control the processor temperature through the use of two
different methods defined as TM1 and TM2. TM1 method consists of the modulation
(starting and stopping) of the processor clocks at a 50% duty cycle. The TM2 method
initiates an Enhanced Intel Speedstep transition to the lowest performance state once
the processor silicon reaches the maximum operating temperature.
Note
The maximum operating temperature for Intel
®
Atom™, Core™ 2 Duo, Core™ Duo and
Celeron M processors is 100°C. TM2 mode is used for Intel
®
Atom™, Core™ 2 Duo and
Core™ Duo processors, it is not supported by Intel
®
Celeron M processors.
Two modes are supported by the Thermal Monitor to activate the TCC. They are called
Automatic and On-Demand. No additional hardware, software, or handling routines are
necessary when using Automatic Mode.
Note
To ensure that the TCC is active for only short periods of time thus reducing the impact
on processor performance to a minimum, it is necessary to have a properly designed
thermal solution. The Intel
®
Core™ 2 Duo, Core™ Duo and Celeron M processor's
respective datasheet can provide you with more information about this subject.
THERMTRIP# signal is used by Intel's Intel
®
Atom™, Core™ 2 Duo, Core™ Duo and
Celeron M processors for catastrophic thermal protection. If the processor's silicon
reaches a temperature of approximately 125°C then the processor signal THERMTRIP#
will go active and the system will automatically shut down to prevent any damage to the
processor as a result of overheating. The THERMTRIP# signal activation is completely
independent from processor activity and therefore does not produce any bus cycles.
Note
In order for THERMTRIP# to be able to automatically switch off the system it is
necessary to use an ATX style power supply.
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