Datasheet 85

Thermal Specifications and Design Considerations

and in some cases may result in a T

that exceeds the specified maximum temperature

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. Refer to the appropriate Thermal and Mechanical

Design Guidelines (see Section 1.2) for information on designing a thermal solution.

The duty cycle for the TCC, when activated by the Thermal Monitor, is factory

configured and cannot be modified. The Thermal Monitor does not require any

additional hardware, software drivers, or interrupt handling routines.

5.2.2 Thermal Monitor 2

The processor also supports an additional power reduction capability known as Thermal

Monitor 2. This mechanism provides an efficient means for limiting the processor

temperature by reducing the power consumption within the processor.

When Thermal Monitor 2 is enabled, and a high temperature situation is detected, the

Thermal Control Circuit (TCC) will be activated. The TCC causes the processor to adjust

its operating frequency (via the bus multiplier) and input voltage (via the VID signals).

This combination of reduced frequency and VID results in a reduction to the processor

power consumption.

A processor enabled for Thermal Monitor 2 includes two operating points, each

consisting of a specific operating frequency and voltage. The first operating point

represents the normal operating condition for the processor. Under this condition, the

core-frequency-to-FSB multiple used by the processor is that contained in the

appropriate MSR and the VID is that specified in Table 5. These parameters represent

normal system operation.

The second operating point consists of both a lower operating frequency and voltage.

When the TCC is activated, the processor automatically transitions to the new

frequency. This transition occurs very rapidly (on the order of 5 μs). During the

frequency transition, the processor is unable to service any bus requests, and

consequently, all bus traffic is blocked. Edge-triggered interrupts will be latched and

kept pending until the processor resumes operation at the new frequency.

Once the new operating frequency is engaged, the processor will transition to the new

core operating voltage by issuing a new VID code to the voltage regulator. The voltage

regulator must support dynamic VID steps to support Thermal Monitor 2. During the

voltage change, it will be necessary to transition through multiple VID codes to reach

the target operating voltage. Each step will likely be one VID table entry (see Table 5).

The processor continues to execute instructions during the voltage transition.

Operation at the lower voltage reduces the power consumption of the processor.

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

transitions of the TCC when the processor temperature is near its maximum operating

temperature. Once the temperature has dropped below the maximum operating

temperature, and the hysteresis timer has expired, the operating frequency and

voltage transition back to the normal system operating point. Transition of the VID code

will occur first, to insure proper operation once the processor reaches its normal

operating frequency. Refer to Figure 25 for an illustration of this ordering.

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 117 118

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