电脑上电时序的介绍

PowerSequencesDel_TanACPIGlobalSystemStates1.G3-MechanicalOffStateATXUnplugedBatteryPowerOnly2.G2/S5-SoftOffATXpluged+5VStandbyandBattery3.G1-GlobalSleepingStateS1:NosystemcontextislostS2:CachecontextislostS3:CPU,cache,andchipsetcontextislost.Memoryismaintained.SuspendToRAM(STR)S4:systemcontextismaintainedinNon-volatilestorage.SuspendToDisk(STD)LegacyG3MechanicalOffG0(S0)WorkingG2(S5)SoftOffS4S3S2G1SleepingS1BIOSRoutineWakeEvents4.G0-GlobalWorkingStateFullrunningCPUStatesC0,C1,C2,C3State/SubstatesLegacyName/DescriptionG0/S0/C0FullOn:Processoroperating.Individualdevicesmaybeshutdowntosavepower.ThedifferentprocessoroperatinglevelsaredefinedbyCxstates,asshowninnexttable.withintheC0state,theIntelICH8canthrottletheprocessorusingtheSTPCLK#singaltoreducepowerconsumption.ThethrottlingcanbeinitiatedbysoftwareorbytheoperatingsystemorBIOS.G0/S0/C1Auto-Halt:ProcessorhasexecutedanAutoHaltinstructionandisnotexecutingcode.Theprocessorsnoopsthebusandmaintainscachecoherency.G0/S0/C2(MobileOnly)Stop-Grant:TheSTPCLK#signalgoesactivetotheprocessor.TheprocessorperformsaStop-Grantcycle,haltsitsinstructionstream,andremainsinthatstateuntiltheSTPCLK#signalgoesinactive,IntheStop-Grantstate,theprocessorsnoopsthebusandmaintainscachecoherency.G0/S0/C3(MobileOnly)Stop-Grand:TheSTPCLK#signalgoesactivetotheprocessor.TheprocessorperformsaStop-Grantcycle,haltsitsinstructionstream,ICH8thenassertsDPSLP#followedbySTP_CPU#,whichforcestheclockgeneratortostoptheprocessorclock.ThisisalsousedforIntelSpeedSteptechnologysupport.Accessestomemory(bygraphice,PCI,orinternalunits)isnotpermittedwhileinaC3state.G0/S0/C4(MobileOnly)Stop-ClockwithLowerProcessorVoltage:ThiscloselyresemblestheG0/S0/C3state.However,aftertheICH8hasassertedSTP_CPU#,itthenlowersthevoltagetotheprocessor.Thisreducestheleakageontheprocessor.PriortoexitingtheC4state,theICH8increasesthevoltagetotheprocessor.G1/S3Suspend-To-RAM(STR):ThesystemcontextismaintainedinsystemDRAM,butpowerisshutofftonon-critical.Memoryisretained,andrefreshescontinue.AllclocksstopexecptRTCclock.G1/S4Suspend-To-Disk(STD):Thecontextofthesystemismaintaintedonthedisk.Allpoweristhenshutofftothesystemexceptforthelogicrequiredtoresume.G2/S5SoftOff(SOFF):Systemcontextisnotmaintained.Allpowerisshutoffexceptforthelogicrequiredtorestart.Afullbootisrequiredwhenwaking.G3MechanicalOFF(MOFF):Systemcontextnotmaintained.AllpowerisshutoffexceptfortheRTC.NoWakeeventsarepossible,becausethesystemdoesnothaveanypower.Thisstateoccursiftheuserremovesthebatteries,turnsofffamechanicalswitch,orifthesystempowersupplyisatalevelthatisinsufficienttopowerthewakinglogic.Whensystempowerreturns,transitionwilldependsonthestatejustpriortotheentrytoG3andtheAFTERG3bitintheGEN_PMCON3register.T2005ms;T20410ms;T21499msG3toS5orinS4/S5sequenceAC_IN#PM_PWRBTN#-1Delay20msPM_RSMRST#-1endVSUS_ONendVSUS_ON-0PM_RSMRST#-0end0101STARTWaitVSUS_GD=1VSUS_ON-1Delay5ms01TimingDiagramS4/S5toS0SequencePM_PWRBTN#-1Delay20msPM_RSMRST#-1BSTARTVSUS_ONDJ_SW#flag0101DJ_LED#-0PWR_LED_UP#-1PWR_LED_UP#-0ASTARTPM_THERM#-1PM_PWRBTN#-0Delay50msPM_PWRBTN#-1WaitSLP_S4#=1thenSUSC_ON-1WaitSLP_S3#=1thenSUSB_ON-1WaitALL_SYSTEM_PWRGD=1Delay110msCPU_VRON-1WaitCPU_PWRGD=1EC_CLK_EN-1Delay10msICH8_PWROK-1WaitLPCRST#=1thenLCD_BACKOFF#-1endBSTARTVSUS_ON-1Delay5msWaitVSUS_GD=101TimingDiagramICH8SequencePowerDeliveryArchitecturalProcessorFetchCycle