Thermal Specifications
control, similar to Thermal Monitor 2 (TM2) in previous generation processors) involves the processor reducing its operating frequency (via the core ratio multiplier) and input voltage (via the VID signals). This combination of lower frequency and VID results in a reduction of the processor power consumption. The second method (clock modulation, known as Thermal Monitor 1 or TM1 in previous generation processors) reduces power consumption by modulating (starting and stopping) the internal processor core clocks. The processor intelligently selects the appropriate TCC method to use on a dynamic basis. BIOS is not required to select a specific method (as with
When the TCC activation temperature is reached, the processor will initiate TM2 in attempt to reduce its temperature. If TM2 is unable to reduce the processor temperature, then TM1 will be also be activated. TM1 and TM2 will work together (clocks will be modulated at the lowest frequency ratio) to reduce power dissipation and temperature.
With a properly designed and characterized thermal solution, 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. An
and in some cases may result in a TCASE that exceeds the specified maximum temperature and may affect the
thermal solution that is significantly
The Thermal Monitor does not require any additional hardware, software drivers, or interrupt handling routines. The following sections provide more details on the different TCC mechanisms used by the processor.
6.2.2.1Frequency/VID Control
When the Digital Temperature Sensor (DTS) reaches a value of 0 (DTS temperatures reported via PECI may not equal zero when PROCHOT# is activated, see
Section 6.2.2.5 for further details), the TCC will be activated and the PROCHOT# signal will be asserted. This indicates the processors' temperature has met or exceeded the factory calibrated trip temperature and it will take action to reduce the temperature.
Upon activation of the TCC, the processor will stop the core clocks, reduce the core ratio multiplier by 1 ratio and restart the clocks. All processor activity stops during this frequency transition which occurs within 2 us. Once the clocks have been restarted at the new lower frequency, processor activity resumes while the voltage requested by the VID lines is stepped down to the minimum possible for the particular frequency. Running the processor at the lower frequency and voltage will reduce power consumption and should allow the processor to cool off. If after 1ms the processor is still too hot (the temperature has not dropped below the TCC activation point, DTS still = 0 and PROCHOT is still active), then a second frequency and voltage transition will
Thermal/Mechanical Specifications and Design Guidelines | 55 |