MIPI-DSI-Essential(MIPI协议详细介绍)

MIPIDSIEssential,2,TableofContents,MIPIDSIOverviewPHYLayerD-PHYArchitectureGlobalOperationLaneManagementLayerDSIProtocolLayer,MIPIDSIOverview,SerialInterfaceLowPinCountReducedPowerConsumption2TypesofDataSignalingHighSpeedDataTransmission-500Mbps/Lane,differentialsignalingLowPowerDataTransmission-10Mbps,singleendedsignaling,lane0onlyLane-Scalable,upto4datalanesPacketBasedDataTransmissionDSIProtocolhasECC,CRCcapability-robustdatatransmissionProtocolSupportMultipledisplays(upto4)SupportAllLegacyParallelInterfaceFunctionalityMIPIDSICommandMode-MIPIDBIInterface(I-80Interface)MIPIDSIVideoMode-MIPIDPIInterface(RGBInterface),4,MIPIDSIInterfacePhysicalArchitecture,1ClockLane,unidirectional1to4DataLanesLane0isbidirectionalforLPdataoutputtransmissionofthedriverIC,5,MIPIDSIFunctionalLayers,TransmitterSide,N*8-bits,ReceiverSide,PHYLayer,Data3,Control,PHYLayer,Control,Data2,Data1,Data0,N*8-bits,Data1,Data3,Data3,Data0,HighSpeedUnidirectionalClockLane0-HighSpeedbidirectionalDataLane1-HighSpeedUnidirectionalDataLane2-HighSpeedUnidirectionalDataLane3-HighSpeedUnidirectionalData,PhysicalTransmission/ReceptionSerializer/DeserializerByteClockGeneration/Recovery(DDR)perMIPID-PHYSpec,6,VideoModeDisplay,DisplayDriver,HostProcessor,DisplayPanel,LCDDisplay,BusInterface,BusInterface,ColorFrameBuffer,DisplayRefresh,TimingControl,UpdateFrameBuffer,7,CommandModeDisplay,HostProcessor,DisplayPanel,LCDDisplay,BusInterface,ColorFrameBuffer,ImageUpdateData,Commands&ImageUpdateData,BusInterface,DisplayController,PHYLayer,D-PHYArchitecture,9,PHYLaneConfiguration,MinimumConfigurationAtleast1ClockLane,1DataLaneReverse-directiontrafficuseslane0onlyLane1,2,3(ifpresent)areunidirectionalLanenumberfixedatdesign/manufacture(Modulelevel)Nodynamiclaneconfigurationbyhostprocessor.,10,D-PHYLaneModule(1/2),TransmissiondataUnitOnebyteLaneModulemaycontainHS-TX,HS-RX,orbothIfLPmodeisusedatcommandmodeconfiguration,bothhostandperipheralmustincludeLPRxandLPTxAlsoCDneededifbi-directionalinuseTheLP-CDshallcheckforcontentionatleastoncebeforedrivinganewstateonthelineMasterandaSlaveconcept,11,D-PHYLaneModule(2/2),Lowpowertransmitter,Highspeedreceiver,Lowpowerreceiver,Contention(=“collision”)detection,Highspeedtransmitter,12,LeastPHYLaneConfiguration-DetailedView,Datalane0,CLKlane,*Bi-directionalbutnotHSreverse*LPforbi-directional,*uni-directional*LPforminimumtransitioncontrol,13,D-PHYSignalLevel,2TypesofSignalLevelHSDTLPDT,LPVOH-typ1.2V,1.1V1.3V,HSdiff-typ200mv,140mv270mv,HScomm-typ200mv,150mv250mv,LPVOH-typ0V,-50mV50mV,LPVIL:550mV,LPVIH-typ1.2v0.88V1.35V,14,HSMode-TransmitterReceiverStructure,HSDataTransmissionWhileHSDTisactive,TerminationRisenabled,15,HSMode-SignalingDetailedView,300mv,100mv,200mv,100mv,200mv,Vdiff=|VOD|,Vdiff200mV,Vcm200mVTypCondition,16,HSMode-ClockTransmission,HSClockDDRClockStructure,1ClkPeriod:2*UIClockBurstalwayscontainsanevennumberoftransitionClockcanalsorunwhileD0isinLPmode(especiallyVideomode)Ex)500MbpsFreq:250Mhz,1ClkPeriod:4ns,IU=2ns,17,HSMode-ClocktoData,DatatoClockTimingDefinition90DegreePhaseShiftCLKtoDataTheFirstbitofDSIPacketmustbesentatarisingedgeofHSClk,DataLane,ClockLane,18,HSDTSignalinPractice,VCM=200mVnom,Vo+:typically300mV,Vo-:typically100mV,Vdiff(positive),19,LPSignalingDetailedView,Typically1.2VTLPX-min:50ns,20,LPDTSignalinPractice,2TLPX,typically1.2V,DP,DN,PHYLayer,GlobalOperation,22,DataUnitOfD-PHY,MinimumDataUnitis1ByteTransmitter-Bytestream-BitstreamReceiver-Bitstream-BytestreamHSLanecanbedifferential1or0LPLaneonD0canhavefourstate(LP+/-)LP00:Bridge,SpaceLP01:HS-Rqst,Mark-0LP10:LP-Rqst,Mart-1LP11:Stop,23,D-PHYOperationFlowDiagram,LP-11(Stop)StateThestartstateofeveryoperation.MajorThreeTypeModesEscapeModeHSTBusTurnAroundPHYStateisdecidedbyLPstateHSDT:LP11-LP01-LP00-HSDT-LP-11LPDT:LP11-LP10-LP00-EscapeMode-LP11InCaseofClockLaneHSTisSupportedforClockSupply,24,EscapeModeOperation,EscapeModeEntry,EscapeModeLeaveEscapeModeCommands,25,EscapeModeOperation-LPDT,LowPowerDataTransmission,26,EscapeModeOperation-ResetTrigger,UltraLowPowerState,27,EscapeModeinPractice-LPDT,EMELP11-LP10-LP00-LP01-LP00,EscapeModeCommandLPDT11100001(0 x87),Data1-10011100(0 x39)(PacketHeader),DP,DN,28,HSModeOperation,HighSpeedDataTransmissionRequestLP11-LP01-LP00Clock,DataLane:SameEntryHighSpeedClockLaneisstartedbeforeDataTransmission,29,HSModeOperation-DataLaneEntry,LowPowerModetoHighSpeedModeLP11-LP01-LP00-SOT-HSDTSynchronizationCode:00011101DataTransmission,30,HSModeOperation-DataLaneLeave,LowPowerModetoHighSpeedModeHSDT-EOT-LP11,31,HSModeOperationinPractice-LPDTtoHSDT,LP01,LP00,LP11,LPTransmitterDriving,HSTransmitterDriving,HSClock,R-termOn,DP,DN,32,HSModeOperationinPractice-SOT,SOT00011101,DATA0,Clk,Data,33,BusTurnAround,HandoverBusPossessionHosttoclient,clienttohostWhenhostrequestdatafromclientandwhenhostreadstatusofclientClientmustsendBTAafterclientsdatatransmissionTE-signalingSequence(ex,ReadRequesttoClient)HostSendReadRequesttoClient-HostsendsBTA-ClientGetBus-HostReleasesBus-Clientsendsdata-ClientsendsBTA-HostGetBusLP11-LP10-LP00-LP10-LP00,34,BusTurnAroundinPractice,BTA,ClientLPDT,HostDriving,ClientDriving,DP,DN,LaneManagementLayer,36,MultiLaneDistributionandMerging,DistributorFunction(transmit),MergerFunction(receive),37,DataTransmissionExample-2Lane,38,DataTransmissionExample-3Lane,DSIProtocolLayer,40,Packet-basedProtocol,DataFlowImagedata,Signalevents,Commands-ProtocolLayer-Packets-Physicallayer-PacketReceive-InterpretPackettoImagedata,SignalEvent,CommandsSignalEvent:V-sync,H-sync.Commands:DCSCommandsManypacketscanbetransferredinatransmissionPacketConcatenationPacketTypesShortPacket-4byteincludeECCLongPacket-upto65kbytes,41,ShortPacketFormat,ECCGeneration,-DI-Data0-Data1,ECC,42,LongPacketFormat,CRCCalculation,-Data,CRC,ECCGeneration,-DI-WordCount,ECC,43,EndianPolicy,LongPacketCaseLSByteFirst,MSByteLast,44,VirtualChannel,Upto4peripheralspossiblewithtaggedcommandorblocksofdata,usingtheVirtualChannelIDFieldDSIhubisneeded,Notpossibletoconnectmanydisplaytosamebus,DSIHub,HostProcessor,MainDisplayPanel,LCDDisplay,BusInterface,BusInterface,DSI,Out1,Out2,Interface,LCDDisplay,FrameBuffer,Sub-Display,45,MultiplePacketsperTransmission,-WithEoTp,-WithoutEoTp,46,DataType,OnlyVideoMode,VideoModeCommandMode,MotorolaLegacyoperationforvideomode,ProtocolSpecific,47,DataType,OnlyVideoMode,VideoModeCommandMode,ProtocolSpecific,48,PacketsforDCScommands,DCSShortWrite:writeasingledatabytetoaperipheral05h/15h(noparameters/oneparameter)IfBTAfollowsACKbydisplayorAwERDCSLongWrite/write_LUTCommand,DataType=111001(39h)UsedtosendlargerblocksofdatatoadisplaymoduleDIbyte,atwo-byteWC,anECCbyte,followedbytheDCSCommandByte,apayloadoflengthWCminusonebytes,andatwo-bytechecksumDCSReadRequest,NoParameters,DataType=000110(06h)usedtorequestdatafromadisplaymodule.IDbyte,aDCSReadcommand,abytesetto00handanECCbyte.BTAafterthecommand(immediatelyofsometimeafterbutbeforenextcommand)Displayresponse:shortorlongpacket,49,PacketsforDSIProtocol,SetMaximumReturnPacketSize,DataType=110111(37h)ThispreventsFIFOoverflowforReadpacketpayloadinprocessor,consideringthecasethatMemoryreadcommandcanretrieveanumerousbytesofdata.NullPacket(Long),DataType=001001(09h)Thispreventsthedatalane(s)goingbacktoLP-11,withlessoverheadtocontinueHSburst.Theminimumpacketsizeis6(4bytesPH+0bytepayload+2bytesCRCchecksum).EoTp,DataType=001000(08h)ShouldbeenabledwhenHSDTAnEoTphasafixedformatasfollowsDataType=DI5:0=0b001000VirtualChannel=DI7:6=0b00PayloadData15:0=0 x0F0FECC7:0=0 x01,50,PacketsforVideomode,SyncEvent:generatev