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Thermal Specifications

104 Document Number: 318080-002

speed dependent and will decrease as processor core frequencies increase. 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 TCC goes inactive and clock modulation ceases.

With thermal solutions designed to each of the Intel

Xeon

Processor 7200 Series

and 7300 Series Thermal Profile 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 so minor that it would be immeasurable. 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 Dual-Core Intel® Xeon® Processor 7200 Series and

Quad-Core Intel® Xeon® Processor 7300 Series Thermal / Mechanical Design Guide

for information on designing a thermal solution.

The duty cycle for the TCC, when activated by the TM1, is factory configured and

cannot be modified. The TM1 does not require any additional hardware, software

drivers, or interrupt handling routines.

6.2.3 Thermal Monitor 2

The Intel

Xeon

Processor 7200 Series and 7300 Series adds supports for an

Enhanced Thermal Monitor capability known as Thermal Monitor 2 (TM2). This

mechanism provides an efficient means for limiting the processor temperature by

reducing the power consumption within the processor. The Thermal Monitor or

Enhanced Thermal Monitor must be enabled for the processor to be operating within

specifications. TM2 requires support for dynamic VID transitions in the platform.

Note: Not all Intel

Xeon

Processor 7200 Series and 7300 Series are capable of supporting

TM2.

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

Thermal Control Circuit (TCC) will be activated for all processor cores. 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, which is identical for both

processor dies. The first operating point represents the normal operating condition for

the processor. Under this condition, the core-frequency-to-system-bus multiplier

utilized by the processor is that contained in the CLOCK_FLEX_MAX MSR and the VID

that is specified in Table 2-3.

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

The lowest operating frequency is determined by the lowest supported bus ratio (1/6

for the Intel

Xeon

Processor 7200 Series and 7300 Series). When the TCC is

activated, the processor automatically transitions to the new frequency. This transition

occurs 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 in order to support Thermal Monitor 2.

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

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