430 datasheet(69/71 Pages) INTEL

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Datasheet

Thermal Specifications and Design Considerations

When Intel Thermal Monitor 1 is enabled while 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 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 MSRs, 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#.

Note:

PROCHOT# will not be asserted when the processor is in the Stop Grant, Sleep and

Deep Sleep low power states (internal clocks stopped), hence the thermal diode

reading must be used as a safeguard to maintain the processor junction temperature

within maximum specification. 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 the processor enters one of the

above low power states with PROCHOT# already asserted, PROCHOT# will remain

asserted until the processor exits the low power state and the processor junction

temperature drops below the thermal trip point.

Contact your Intel representative for more details on the Intel Thermal Monitor register

and programming details.

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 3.5.

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