User`s manual

66 CMX34GS cpuModule BDM-610000082 Rev A
Thermal Management
The cpuModule has several thermal features which can be used to monitor and control the board’s temperature
when extreme operating conditions are prevalent.
Thermal Monitor
The Thermal Monitor is a feature on the CMX34GS that automatically throttles the CPU when the CPU exceeds
its thermal limit. The maximum temperature of the processor is defined as the temperature that the Thermal
Monitor is activated. The thermal limit and duty cycle of the Thermal Monitor cannot be modified.
Hardware-Enforced Thermal Protection
The processor includes a hardware-enforced thermal protection mechanism which will cause the processor to
enter a Thermal Trip state when the processor’s temperature has approached the point at which may be
damaged.
Upon entering the Thermal Trip state, the CMX34GS will immediately transition to the S5 (Soft-Off) ACPI power
state. To exit theThermal Trip state (and S5), a power cycle or RSM reset (deepest reset) is required. The reset
may be configured as an RSM reset (default BIOS setting) in the BIOS setup utility. For more information on the
S5 power state, refer to Advanced Configuration and Power Interface (ACPI)—page 67.
The reset status register contains a bit which indicates if the cpuModule has entered S5 as a result of the
processor entering the Thermal Trip state. For more information on the reset status register, refer to Reset Status
Register—page 70.
Further Temperature Reduction
The cpuModule’s temperature is directly related to power consumption. Reducing the power consumption of
the cpuModule will have an effect on the cpuModule’s temperature. Suggested methods for reducing the
cpuModule’s power consumption can be found in the Power Management section on page 67.
Note The CPU and PCB temperatures displayed in the BIOS are approximate and should not be used to
validate a cooling solution.