CPU温控及节电技术.ppt

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1、CPUThermalControl&PowerSavingTechnicBIOS:BruceOverviewThermalControlTechnic“ThermalThrottling”PowerSavingTechnic“PerformanceState”ThermalThrottlingIntelPentium4andAMDAthlonXPCPUbothhaveasetofthermalDiodetodetectCPU’stemperatureToimplement“ThermalThrottling”function,theyse

2、tamechanismbetweenCPUinternalfrequencyandexternalfrequency,plusthediodetogethernamed“ThermalMonitor”InthecaseofnormalCPUtemperature“ThermalMonitor”wouldnotaffectCPU’shostfrequencyWhentheCPUishotthancriticaltemperature,“ThermalMonitor”wouldgeneratea“Internalclockdutycycle”

3、toignoresomeCPU’snormalinternalclock.SotheCPU’performancewillpoorandthetemperaturewillfalltogether.ImplementOnVIAPlatformVIAVT8237SBprovidea“Internalclockdutycycle”named“STPCLK#”Atsoftwaresideshouldset“dutycycle”percentfirst,thenuserealtimedetectandcontroltomakethrottling

4、enableatcriticaltime.PerformanceStateAccordingtoACPI3.0spec,OScoulddetectthesystem’sworkloadthroughBIOSanddevicedriver.Accordingtoworkload,APCIspecifiedtheCPUP-state(performancestate)fromP0、P1……toPnCPUspeed:P0(fullspeed)>P1……>PnCorevoltage:P0>P1……>PnIntelPentiumM1.6GHzP-S

5、tatestructure，lowestX6VIAC7M1.6GHzP-Statestructure，lowestX4EnhancedIntelSpeedSteptechnology(EIST)AMDCoolN’QuietVIAEnhancedPowerSaverC7MLowerpowerconsuming&LowerP-stateBackGroundGenerally,processorchangefromone‘P-state’toanotherstateneedsacomplicatedprocessPauseCPU=>>Reset

6、PLL=>>CPUclocksteadyVIA‘TwinTurboPLL’technologyprovidetwoPLLatthesametime.THANKS