Intel i3-4360T CM8064601481958 User Manual

When the TCC is activated, the processor will sequentially step down the ratio

multipliers and VIDs in an attempt to reduce the silicon temperature. If the

temperature continues to increase and exceeds the TCC activation temperature by

approximately 5 °C before the lowest ratio/VID combination has been reached, the

processor will immediately transition to the combined TM1/TM2 condition. The

processor remains in this state until the temperature has dropped below the TCC

activation point. Once below the TCC activation temperature, TM1 will be discontinued

and TM2 will be exited by stepping up to the appropriate ratio/VID state.

If TM2 is unable to reduce the processor temperature, then TM1 will be also be

activated. TM1 and TM2 will then work together to reduce power dissipation and

temperature. It is expected that only a catastrophic thermal solution failure would

create a situation where both TM1 and TM2 are active.

If TM1 and TM2 have both been active for greater than 20 ms and the processor

temperature has not dropped below the TCC activation point, the Critical Temperature

Flag in the IA32_THERM_STATUS MSR will be set. This flag is an indicator of a

catastrophic thermal solution failure and that the processor cannot reduce its

temperature. Unless immediate action is taken to resolve the failure, the processor

will probably reach the Thermtrip temperature (see 

 on page 91)

within a short time. To prevent possible permanent silicon damage, Intel recommends

removing power from the processor within ½ second of the Critical Temperature Flag

being set.

An external signal, PROCHOT# (processor hot), is asserted when the processor core

temperature has exceeded its specification. If Adaptive Thermal Monitor is enabled (it

must be enabled for the processor to be operating within specification), the TCC will

be active when PROCHOT# is asserted.

The processor can be configured to generate an interrupt upon the assertion or de-

assertion of PROCHOT#.

By default, the PROCHOT# signal is set to bi-directional. However, it is recommended

to configure the signal as an input only. When configured as an input or bi-directional

signal, PROCHOT# can be used for thermally protecting other platform components

should they overheat as well. When PROCHOT# is driven by an external device:
•

The package will immediately transition to the minimum operation points (voltage

and frequency) supported by the processor and graphics cores. This is contrary to

the internally-generated Adaptive Thermal Monitor response.

•

Clock modulation is not activated.

The TCC will remain active until the system de-asserts PROCHOT#. The processor can

be configured to generate an interrupt upon assertion and de-assertion of the

PROCHOT# signal. Refer to the appropriate Platform Thermal Mechanical Design

Guidelines (see Related Doucments section) for details on implementing the bi-

directional PROCHOT# feature.

Toggling PROCHOT# more than once in 1.5 ms period will result in constant Pn state

of the processor.

Desktop 4th Generation Intel

®

 Core

™

 Processor Family, Desktop Intel

®

 Pentium

®

 Processor Family, and Desktop Intel

®

 Celeron

®

Processor Family

Datasheet – Volume 1 of 2

July 2014

80

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