Intel LE80557RE009512 Arkusz Danych Pobierz pdf (Strona 64)

Thermal Specifications

64 Datasheet

5.4 Intel

Thermal Monitor

The Intel Thermal Monitor helps control the processor temperature by activating the

TCC (Thermal Control Circuit) when the processor silicon reaches its maximum

operating temperature. The temperature at which the Intel Thermal Monitor activates

the TCC is not user configurable. Bus traffic is snooped in the normal manner and

interrupt requests are latched (and serviced during the time that the clocks are on)

while the TCC is active.

With a properly designed and characterized thermal solution, it is anticipated that the

TCC would only be activated for very short periods of time when running the most

power intensive applications. The processor performance impact due to these brief

periods of TCC activation is expected to be minor and hence not detectable.

Caution: An under-designed thermal solution that is not able to prevent excessive activation of

the TCC in the anticipated ambient environment may cause a noticeable performance

loss and may affect the long-term reliability of the processor. In addition, a thermal

solution that is significantly under designed may not be capable of cooling the

processor even when the TCC is active continuously.

The Intel Thermal Monitor controls the processor temperature by modulating (starting

and stopping) the processor core clocks when the processor silicon reaches its

maximum operating temperature. The Intel Thermal Monitor uses two modes to

activate the TCC: Automatic mode and on-demand mode. If both modes are activated,

automatic mode takes precedence.

Note: The Intel Thermal Monitor automatic mode must be enabled through BIOS for the

processor to be operating within specifications.

The processor supports an automatic mode called Intel Thermal Monitor 1 (TM1). This

mode is enabled by writing values to the MSRs of the processor. After automatic mode

is enabled, the TCC will activate only when the internal die temperature reaches the

maximum allowed value for operation.

During high temperature situations, TM1 will modulate the clocks by alternately turning

the clocks off and on at a 50% duty cycle. Cycle times are processor speed dependent

and will decrease linearly as processor core frequencies increase. Once the

temperature has returned to a non-critical level, modulation ceases and TCC goes

inactive. A small amount of hysteresis has been included to prevent rapid active/

inactive transitions of the TCC when the processor temperature is near the trip point.

The duty cycle is factory configured and cannot be modified. Also, automatic mode

does not require any additional hardware, software drivers, or interrupt handling

routines. Processor performance will be decreased by the same amount as the duty

cycle when the TCC is active.

The TCC may also be activated via on-demand mode. If bit 4 of the ACPI Intel Thermal

Monitor control register is written to a 1, the TCC will be activated immediately

independent of the processor temperature. When using on-demand mode to activate

the TCC, the duty cycle of the clock modulation is programmable via bits 3:1 of the

same ACPI Intel Thermal Monitor control register. In automatic mode, the duty cycle is

fixed at 50% on, 50% off, however in on-demand mode, the duty cycle can be

programmed from 12.5% on/ 87.5% off, to 87.5% on/12.5% off in 12.5% increments.

On-demand mode may be used at the same time automatic mode is enabled, however,

if the system tries to enable the TCC via on-demand mode at the same time automatic

mode is enabled and a high temperature condition exists, automatic mode will take

precedence.

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

that its temperature is above the thermal trip point. Bus snooping and interrupt

latching are also active while the TCC is active.

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