Thermal Monitor 2 (Tm2); Tm1 And Tm2 Operation; Catastrophic Cooling Failure Sensor - Kontron CP308 User Manual

CP308
TM1 does not require any additional hardware, software drivers, or interrupt handling routines.
This function can be enabled and disabled in the uEFI BIOS.
Note ...
When the TH LED on the front panel is lit after a successful boot-up, it indicates
that the processor die temperature is above 105°C.
6.2.4

Thermal Monitor 2 (TM2)

The Thermal Monitor 2 (TM2) Sensor controls the processor temperature and power consump-
tion using the Intel® Speedstep® function, which is always available to TM2 when the proces-
sor silicon reaches its maximum operating temperature (105°C).
When TM2 is enabled and a high temperature situation exists, the processor will perform an
Enhanced Intel® SpeedStep® Technology transition to a lower operating point. In this case, the
processor reduces its operating frequency and processor core voltage. This combination of re-
duced frequency and core voltage results in a reduction of the processor power consumption.
When the processor temperature is again within specification, TM2 returns the processor to the
last requested SpeedStep® state.
The temperature at which TM2 activates the Intel® Speedstep® function is neither user-con-
figurable nor software-visible.
TM2 does not require any additional hardware, software drivers, or interrupt handling routines.
This function can be enabled and disabled in the uEFI BIOS.
Note ...
When the TH LED on the front panel is lit after a successful boot-up, it indicates
that the processor die temperature is above 105°C.
6.2.5

TM1 and TM2 Operation

TM1 and TM2 are built-in functions of the CPU. They can be enabled or disabled via the uEFI
BIOS. When the Thermal Monitor feature is enabled, TM2 has priority over TM1. If TM2 does
not provide sufficient temperature reduction, TM1 will be activated in addition to TM2. If the
Thermal Monitor feature is disabled, it is the responsibility of the user to ensure that the CPU
is not operated above 105°C.
6.2.6

Catastrophic Cooling Failure Sensor

The Catastrophic Cooling Failure Sensor protects the processor from catastrophic overheating.
The Catastrophic Cooling Failure Sensor threshold is set well above the maximum operating
temperature to ensure that there are no false trips. The processor will stop all executions when
the junction temperature exceeds approximately 125°C. Once activated, the event remains
latched until the CP308 undergoes a power-on restart (all power off and then on again).
This function cannot be enabled or disabled in the uEFI BIOS. It is always enabled to ensure
that the processor is protected in any event.
Note ...
When the TH LED on the front panel is blinking after a successful boot-up, it
indicates that the processor die temperature is above 125°C or the GS45
GMCH die temperature is above 130°C.
ID 1027-4487, Rev. 3.0
Thermal Considerations
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