AU80610006225AASLBXC View Datasheet(PDF) - Intel
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'AU80610006225AASLBXC' PDF : 80 Pages View PDF
Thermal Specifications and Design Considerations
When TM1 is enabled and a high temperature situation exists, the clocks will be
modulated 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 Intel Thermal Monitor automatic mode must be enabled through BIOS for
the processor to be operating within specifications. Intel recommends TM1 be
enabled on the processors.
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.
Besides the thermal sensor and thermal control circuit, the Intel Thermal Monitor also
includes one ACPI register, one performance counter register, three MSR, and one I/O
pin (PROCHOT#). All are available to monitor and control the state of the Intel Thermal
Monitor feature. The Intel Thermal Monitor can be configured to generate an interrupt
upon the assertion or deassertion of PROCHOT#.
If the platform thermal solution is not able to maintain the processor junction
temperature within the maximum specification, the system must initiate an orderly
shutdown to prevent damage.
If Intel Thermal Monitor automatic mode is disabled, the processor will be operating out
of specification. Regardless of enabling the automatic or on-demand modes, in the
event of a catastrophic cooling failure, the processor will automatically shut down when
the silicon has reached a temperature of approximately 125°C. At this point the
THERMTRIP# signal will go active. THERMTRIP# activation is independent of processor
activity and does not generate any bus cycles. When THERMTRIP# is asserted, the
processor core voltage must be shut down within the time specified in Chapter 4.
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