Intel E6700 Mechanical Design Guidelines - Page 33
Thermal Monitor 2
UPC - 735858184618
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Thermal Management Logic and Thermal Monitor Feature Figure 4-1. Thermal Monitor Control PROCHOT# Normal clock Internal clock Duty cycle control Resultant internal clock 4.2.3 Thermal Monitor 2 The second method of power reduction is TM2. TM2 provides an efficient means of reducing the power consumption within the processor and limiting the processor temperature. When TM2 is enabled, and a high temperature situation is detected, the enhanced TCC will be activated. The enhanced TCC causes the processor to adjust its operating frequency (by dropping the bus-to-core multiplier to its minimum available value) and input voltage identification (VID) value. This combination of reduced frequency and VID results in a reduction in processor power consumption. A processor enabled for TM2 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. 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 microseconds). During the frequency transition, the processor is unable to service any bus requests, 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 VID transitions in order to support TM2. During the voltage change, it will be necessary to transition through multiple VID codes to reach the target operating voltage. Each step will be one VID table entry (that is, 12.5 mV steps). The processor continues to execute instructions during the voltage transition. Operation at the lower voltage reduces the power consumption of the processor, providing a temperature reduction. Thermal and Mechanical Design Guidelines 33