8821CURTL8821CU-DataSheet-v02r06详细说明文件

vvRTL8821CU-CGSingle-ChipIEEE802.11a/b/g/n/ac1T1RWLANwithIntegratedBluetooth2.1/4.2withUSB2.0InterfaceDATASHEET(CONFIDENTIAL:DevelopmentPartnersOnly)Rev.0.2r5,Jun,2016TrackID:RealtekSemiconductorCorp.No.2,InnovationRoadII,HsinchuSciencePark,Hsinchu300,TaiwanTel.:+886-3-578-0211.Fax:+886-3-577-6047RTL8821CURTL8821CUDatasheetSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfaceiiTrackSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfaceiiTrackID: Rev.0.2r5COPYRIGHT©2016RealtekSemiconductorCorp.Allrightsreserved.Nopartofthisdocumentmaybereproduced,transmitted,transcribed,storedinaretrievalsystem,ortranslatedintoanylanguageinanyformorbyanymeanswithoutthewrittenpermissionofRealtekSemiconductorCorp.DISCLAIMERRealtekprovidesthisdocument“asis”,withoutwarrantyofanykind.Realtekmaymakeimprovementsand/orchangesinthisdocumentorintheproductdescribedinthisdocumentatanytime.Thisdocumentcouldincludetechnicalinaccuraciesortypographicalerrors.TRADEMARKSRealtekisatrademarkofRealtekSemiconductorCorporation.Othernamesmentionedinthisdocumentaretrademarks/registeredtrademarksoftheirrespectiveowners.USINGTHISDOCUMENTThisdocumentisintendedforthesoftwareengineer’sreferenceandprovidesdetailedprogramminginformation.Thougheveryefforthasbeenmadetoensurethatthisdocumentiscurrentandaccurate,moreinformationmayhavebecomeavailablesubsequenttotheproductionofthisguide.REVISIONHISTORYRevisionReleaseDateSummary0.12016/02/02Preliminaryrelease.0.2r052016/6/20Modifygeneraldescriptionandfeatures02r072016/8/16ModifygeneraldescriptionandfeaturesRTL8821CUDatasheetRTL8821CUDatasheetSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE\*romanivSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE\*romanivTrackID: Rev.0.2r5 TableofContents GENERALDESCRIPTION 1FEATURES 3APPLICATIONDIAGRAMS 611ACDUAL-BAND1X1RFAPPLICATION 6PINASSIGNMENTS 7PACKAGEIDENTIFICATION 7PINDESCRIPTIONS 8POWERONTRAP8USBTRANSCEIVERINTERFACE 8EEPROMINTERFACE 8RFINTERFACE 8LEDINTERFACE 9POWERMANAGEMENTHANDSHAKEINTERFACE 9PCMINTERFACE 10CLOCKANDOTHERPINS 10POWERPINS 10ELECTRICALANDTHERMALCHARACTERISTICS 12TEMPERATURELIMITRATINGS 12DCCHARACTERISTICS 12PowerSupplyCharacteristics 12DigitalIOPinDCCharacteristics 12INTERFACETIMINGSPECIFICATION 13USBBUSDURINGPOWERONSEQUENCE 13PCMINTERFACECHARACTERISTICS 14PCMFormat 14SignExtensionandZeroPaddingfor8-Bitand13-BitSamples 14PCMInterfaceTiming 15MECHANICALDIMENSIONS 17MECHANICALDIMENSIONSNOTES 18ORDERINGINFORMATION 19ListofTablesTABLE1. POWER-ONTRAPPINS 8TABLE2. USBTRANSCEIVERINTERFACE 8TABLE3.EEPROMINTERFACE 8TABLE4.RFINTERFACE 9TABLE5. LEDINTERFACE 9TABLE6.POWERMANAGEMENTHANDSHAKEINTERFACE 9TABLE7.PCMINTERFACE 10TABLE8. CLOCKANDOTHERPINS 10TABLE9. POWERPINS 11TABLE10. TEMPERATURELIMITRATINGS 12TABLE11. DCCHARACTERISTICS 12TABLE12. 3.3VGPIODCCHARACTERISTICS 12TABLE13. THETYPICALTIMINGRANGE 13TABLE14. DIMENSIONSNOTES 18ListofFiguresFIGURE1. DUAL-BANDMIMO1X1SOLUTION(11AC1X1MAC/BB/RF+PA)ANDINTEGRATEDBLUETOOTHCONTROLLERSOLUTIONRTL8821CU-CG FIGURE2. PINASSIGNMENTS 7FIGURE3. RTL8821CU-CGUSBBUSPOWERONSEQUENCE 13FIGURE4.LONGFRAMESYNC 14FIGURE5.SHORTFRAMESYNC 14FOR16-BITLINEARPCMOUTPUT,3OR8UNUSEDBITSMAYBESIGNEXTENDED/ZEROPADDED(FIGURE6,FIGURE7,FIGURE8,FIGURE9) FIGURE6.16-BITOUTPUTDATAWITH8-BITPCMSAMPLEDATAANDSIGNEXTENSION 15FIGURE7.16-BITOUTPUTDATAWITH8-BITPCMSAMPLEDATAANDZEROPADDING 15FIGURE8.16-BITOUTPUTDATAWITH13-BITPCMSAMPLEDATAANDSIGNEXTENSION 15FIGURE9.16-BITOUTPUTDATAWITH13-BITPCMSAMPLEDATAANDAUDIOGAIN 15PLEASEREFERTOFIGURE10 15FIGURE10.PCMINTERFACE(LONGFRAMESYNC) 16RTL8821CUDatasheetRTL8821CUDatasheetSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE6Single-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE6TrackID: Rev.0.2r5GeneralDescriptionTheRealtekRTL8821CU-CGisahighly-integratedIEEE802.11a/b/g/n/acMAC/Baseband/RFWLANandBluetoothBaseband/RFsinglechip.ForWirelessLAN(WLAN)operation,itsupports1-stream802.11acsolutionwithMulti-userMIMO(Multiple-Input,Multiple-Output)STAmodewithUSB2.0networkinterfacecontroller.ForBluetoothoperation,itsupportsBluetooth2.1/4.2withUSBinterfacecontroller.TheRTL8821CU-CGbasebandimplementsmultiuserMultiple-InputMultiple-Output(MIMO)OrthogonalFrequencyDivisionMultiplexing(OFDM)STAmodewithonetransmitandonereceivepath(1T1R).Featuresincludeonespatialstreamtransmission,shortGuardInterval(GI)of400ns,spatialspreading,andsupportforvariantchannelbandwidths.Moreover,RTL8821CU-CGprovidesonespatialstreamSpace-TimeBlockCode(STBC),TransmitBeamforming(TxBF)andLowDensityParityCheck(LDPC)toextendtherangeoftransmission.Astherecipient,theRTL8821CU-CGalsosupportsexplicitsoundingpacketfeedbackthathelpssenderswithbeamformingcapability.Forlegacycompatibility,DirectSequenceSpreadSpectrum(DSSS),ComplementaryCodeKeying(CCK)andOFDMbasebandprocessingareincludedtosupportallIEEE802.11a,802.11band802.11gdatarates.Differentialphaseshiftkeyingmodulationschemes,DBPSKandDQPSKwithdatascramblingcapability,areavailable.CCKprovidessupportforlegacydatarates,withlongorshortpreamble.ThehighspeedFFT/IFFTpathsarecombinedwithBPSK,QPSK,16QAM,64QAMand256QAMmodulationoftheindividualsubcarriers.Thecompatiblecodingrateof1/2,2/3,3/4,and5/6providesupto433.3MbpsforIEEE802.11acwithMIMO-OFDM.TheRTL8821CU-CGbuildsinanenhancedsignaldetector,anadaptivefrequencydomainequalizer,andasoft-decisionViterbidecodertoalleviateseveremulti-patheffectsandmutualinterferenceinthereceptionofmultiplestreams.RobustinterferencedetectionandsuppressionareprovidedtoprotectagainstBluetooth,cordlessphone,andmicrowaveoveninterference.Receivevectordiversityformulti-streamapplicationisimplementedforefficientutilizationoftheMIMOchannel.EfficientIQ-imbalance,DCoffset,phasenoise,frequencyoffset,andtimingoffsetcompensationsareprovidedfortheradiofrequencyfront-end.TheRTL8821CU-CGsupportsfastreceiverAutomaticGainControl(AGC)withsynchronousandasynchronouscontrolloopsamongantennas,antennadiversityfunctions,andadaptivetransmitpowercontrolfunctionstoobtainbetterperformanceintheanalogportionsofthetransceiver.TheRTL8821CU-CGMACsupports802.11eformultimediaapplications,802.11iandWAPI(WirelessAuthenticationPrivacyInfrastructure)forsecurity,and802.11n/acforenhancedMACprotocolefficiency.Protocolefficiencyissignificantlyimprovedbyusingpacketaggregationtechniques,suchasA-MPDUwithBAandA-MSDU.Powersavingmechanisms,suchasLegacyPowerSave,U-APSD,andMIMO,canreducethepowerwastedduringidletime.TheycanalsocompensatefortheextrapowerrequiredtotransmitMIMO-OFDM.TheRTL8821CU-CGprovidessimplelegacyand20MHz/40MHz/80MHzco-existencemechanistoensurebackwardandnetworkcompatibility.TheRTL8821CU-CGBluetoothcontrollercomplieswithBluetoothcorespecificationv4.2,andsupportsdualmode(BR/EDR+AMP+LowEnergyControllers).Itisbackwardcompatiblewithpreviousversionsincludingv2.1+EDRandv3.0+HS.ForBR/EDR,itcansupportscatternettopologyuptofouractivelinksinslavemode,andsevenactivelinksinmastermode.ForLowEnergy,itsupportsmultiplestatesandallowseightactivelinksinmastermode.BothBR/EDRandLEcanoperatesimultaneously.FeaturesGeneralInformation56pinsQFNCMOSMAC,BasebandPHYandRFinsinglechipforIEEE802.11a/b/g/n/accompatibleWLANSupport802.11ac1x1,Wave-2withMU-MIMOSTAmodeComplete802.11nMIMOsolution2.4GHzand5GhzbandHostInterfaceComplieswithUSB2.0forWLANandcontrollerUSBMulti-FunctionforbothBT(USBfunction0)andWLAN(USBfunctionStandardsSupportedIEEE802.11a/b/g/n/accompatibleWLANIEEE802.11eQoSEnhancement(WMM)IEEE802.11i(WPA,WPA2).Open,key,andpair-wisekeyauthenticationservicesIEEE802.11hDFS,TPC,MeasurementMACFeaturesFrame aggregation for increased efficiency(A-MSDU,A-MPDU)Low latency immediate Acknowledgement(BA)LongNAVformediareservationCF-EndforNAVrelease

MaximumPHYdatarateupto86.7Mbpsusing20MHzbandwidth,200Mbpsusing40MHzbandwidth,and433.3Mbps80MHzbandwidth.Backwardcompatiblewith802.11a/b/gdeviceswhileoperatingat802.11ndataratesBackwardcompatiblewithdeviceswhileoperatingat802.11acrates.USBLPM/SelectiveSuspendsupportedIEEE802.11kRadioResourceMeasurementWAPI(WirelessAuthenticationPrivacyInfrastructure)certified.CiscoCompatibleExtensions(CCX)WLANdevicesPHY-levelspoofingtoenhancelegacycompatibilityChannelmanagementandco-existenceMultipleBSSIDfeatureallowstheRTL8821CU-CGtoassumemultipleMACidentitieswhenusedasawirelessbridgeTransmitOpportunity(TXOP)Inter-FrameSpace(SIFS)burstingforhighermultimediabandwidthWiFiDirectsupportswirelesspeertoapplications.WiFiNAN(NeighborhoodAreasupportOtherFeaturesSupports Wake-On-WLAN via PacketandWake-upframeTransmitBeamformingSupportS3/S4AES/TKIPgroupkeyupdatePeripheralInterfacesUpto15GeneralPurposeInput/OutputpinsThreeconfigurableLEDpins(muxGPIOpins)PHYFeaturesIEEE802.11acOFDMIEEE802.11nOFDMOneTransmitandOneReceivepath5MHz/10MHz/20MHz/40MHz/bandwidthtransmissionSupport2.4GHzand5GHzbandchannelsShortGuardInterval(400ns)Soundingpacket.DSSSwithDBPSKandDQPSK,CCKmodulationwithlongandshortOFDM with BPSK, QPSK, 64QAM and 256QAM

WiFiFTM(FineTimesupportedWiFiTDLS(TunneledDirectLinkSetup)SupportedSupportNetworkListOffloadCCAonsecondarythroughRTS/CTShandshake.SupportTCP/UDP/IPchecksumoffloadGenerates40MHzclockforperipheralchip.Singleexternalpowersource3.3VonlyConvolutionalCodingRate:1/2,2/3,and5/6Maximumdatarate54Mbpsin802.11g,150Mbpsin802.11nand433.3bps802.11ac.SwitchdiversityusedforDSSS/CCKSupportSTBCReceivingSupportLDPCTransmittingHardwareantennadiversityFastreceiverAutomaticGainControl(AGC)On-chipADCandDACBuild-inboth2.4GHzand5GHzPABuild-inboth2.4GHzand5GHzLNABluetoothControllerCompatiblewithBluetooth2.1+EDRSupportBluetooth4.2systemIntegratedMCUtoexecuteprotocolstackSupportsallpackettypesinbasicrateenhanceddatarateSupportspiconetsinascatternetSupportsSecureSimplePairingBluetoothTransceiverFastAGCcontroltoimprovereceivingdynamicrangeSupportsAFHtodynamicallydetectqualitytoimprovetransmissionqualityIntegratedinternalClass1,Class2,Class3PA

SupportsLowPowerMode(Sniff/SniffSub-rating)EnhancedBT/WIFICoexistenceControltoimprovetransmissionqualityindifferentprofilesBluetooth4.0DualModesupport:SimultaneousandBR/EDRSupportsmultipleLowEnergystatesSupportsEnhancedPowerControlSupportsBluetoothLowEnergyIntegrated32KoscillatorformanagementDACDACApplicationDiagrams3VSelectalbeCrystal3VSelectalbeCrystalAntennaAntennaSPS/LDORegulatorsNVMemoryExtInterfaceRXI/QDPDTPAWLAN2.4/5GTransceiverMACConfigurationControlandMemoryWLANMCUUSBDiplexerPABaseband(PHY)InterfacePTATXI/QDPDT_SELBTBBControllerRAMBTMCUExternalBalun2.4GHzPABTTransceiverModemBTLEControllerHCIRTL8821CUInternalBalunInternalBalunADCFigure1.Dual-BandMIMO1x1Solution(11ac1x1MAC/BB/RF+PA)andIntegratedBluetoothControllerSolutionRTL8821CU-CGRTL8821CUDatasheetRTL8821CUDatasheetSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE7Single-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE7TrackID: Rev.0.2r5VD33_IOVD10D_WLGPIO14GPIO13VDD_IOGPIO9/WL_DIS#GPIO7GPIO6WL_10AVD33XXOXIWL_VD33_SYNWL_VD1053_SYNVD33_IOVD10D_WLGPIO14GPIO13VDD_IOGPIO9/WL_DIS#GPIO7GPIO6WL_10AVD33XXOXIWL_VD33_SYNWL_VD1053_SYN VD33_SPSLX_SPS EEPROM_SEL/EESKGHIP_ENRREFHSDPHSDMPCM_OUT/GPIO1PCM_SYNC/GPIO2PCM_CLK/GPIO3PCM_OUT/GPIO1PCM_SYNC/GPIO2PCM_CLK/GPIO3TEST_MODE_SELLED1SUS_CLK/EECSBT_V105_LOBUFBT_VD33_SYNBT_VD105_RTXBT_VD33PAD_BTG

WL_VD105_TRXGND424140393837363534333231302943424140393837363534333231302943444546474849505152535455562827262524232221RTL8821CULLLLLLL57GND(ExposedPad)TXXXV2019181716151234567891011121314WLG_VD33_PAWLA_VD33_PAWLA_RFIOWL_VD105_RXALNAON_APAPE_ADPDT_SEL_NDPDT_SEL_PBT_RFINBT_RFIPFigure2.PinAssignmentsPackageIdentificationFigure2,‘Green’packageisindicatedbya‘G’.Thelocationmarkedisindicatedby‘T’.Theversionisshowninthelocationmarked‘V’,e.g.,.B=VersionBRTL8821CUDatasheetRTL8821CUDatasheetSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE9Single-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE9TrackID: Rev.0.2r5PinDescriptionsThefollowingsignaltypecodesareusedinthetable1to9,I: InputO: OutputI/O:Input/Outputpin

P: PowerpinN/A: No Bonding pinPoweronPinSymbolTypePinNo.DescriptionTEST_MODE_SELI5ThispinisalsosharedwithGPIO40:Normaloperationmode1:Test/debugmodeSPS_LDO_SELI6ThispinisalsosharedwithGPIO50:Internalswitchingregulatorselect1:InternalLDOselectEEPROM_SELI46ThispinisalsosharedwithEESKpin0:InternalNVmemoryselect1:ExternalEEPROMselect1. Power-OnPinsUSBInterfaceSymbolTypePinNoDescriptionHSDPI/O51High-SpeedUSBD+SignalHSDMI/O52High-SpeedUSBD-Signal2. USBTransceiverInterfaceEEPROMInterfaceSymbolTypePinNoDescriptionEECSO10ExternalEEPROMChipSelectEESKO46ExternalEEPROMClockTable3.EEPROMInterfaceRFInterfaceSymbolTypePinNoDescriptionBT_RFIPI/O15BT/WLAN2GRFDifferentialI/OPBT_RFINI/O16BT/WLAN2GRFDifferentialI/ONDPDT_SEL_PO17ExternalDPDTCONTROLDPDT_SEL_NO18ExternalDPDTCONTROLPAPE_AO19External5GPAPECONTROLLNAON_AO20External2GLNACONTROLWLA_RFIOO22WLAN5GRFI/OWLG_RFIOO25WLAN2GRFI/OTable4.RFInterfaceLEDInterfaceSymbolTypePinNoDescriptionLED0O7LEDPin(ActiveLow)LED1O8LEDPin(ActiveLow)WL_LEDO9LEDPin(ActiveLow),sharedwithGPIO85. LEDInterfacePowerManagementHandshakeInterfaceSymbolTypePinNoDescriptionWL_DIS#I37SharedwithGPIO9.ThispincanexternallyshutdowntheRTL8821CU-CGWLANfunctionwhenWL_DIS#ispulledWhenthispinispulledUSBinterfacewillbedisabled.ThispincanalsobeconfiguredastheWLANRadio-offfunctionwithhostinterfaceremainingconnected.BT_DIS#I56SharedwithGPIO11.ThispincanexternallyshutdowntheRTL8821CU-CGBTfunctionwhenBT_DIS#ispulledLow.Whenthispinispulledlow,USBinterfacewillbealsodisabled.ThispincanbealsodefinedastheBTRadio-offfunctionwithhostinterfaceremainingconnected.CHIP_ENI47ThisPinCanexternallyshutdowntheRTL8821CU-CG(NoExtraPowerSwitchRequired).Whenthisfunctionisnotrequired,externalpullhighisrequired.Table6.PowerManagementHandshakeInterfaceRTL8821CUDatasheetRTL8821CUDatasheetSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGESingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE10TrackID: Rev.0.2r5PCMInterfaceSymbolTypePinNoDescriptionPCM_INI1PCMdataInput,sharedwithGPIO0PCM_OUTO2PCMdataOut,sharedwithGPIO1PCM_SYNCO3PCMSynchronizationcontrol,sharedwithGPIO2PCM_CLKI/O4PCMClock,sharedwithGPIO3Table7.PCMInterfaceClockandOtherPinsSymbolTypePinNoDescriptionXII3126M/40MHzOSCInputInputof26M/40MHzCrystalClockReferenceXOO32Outputof26MHz/40MHzCrystalClockReferenceSUS_CLKI10SharedwithEECS.External32KorRTCclockinput.GPIO0I/O1GeneralPurposeInput/OutputPinGPIO1I/O2GeneralPurposeInput/OutputPinGPIO2I/O3GeneralPurposeInput/OutputPinGPIO3I/O4GeneralPurposeInput/OutputPinGPIO4I/O5GeneralPurposeInput/OutputPinGPIO5I/O6GeneralPurposeInput/OutputPinGPIO6I/O35GeneralPurposeInput/OutputPinGPIO7I/O36GeneralPurposeInput/OutputPinGPIO8I/O9GeneralPurposeInput/OutputPinGPIO9I/O37GeneralPurposeInput/OutputPinGPIO11I/O56GeneralPurposeInput/OutputPinGPIO13I/O39GeneralPurposeInput/OutputPinGPIO14I/O40GeneralPurposeInput/OutputPinNC26NotConnect8. ClockandOtherPinsPowerPinsSymbolTypePinNoDescriptionLX_SPSP44SwitchingRegulatorOutputVD33_SPSP43SwitchingRegulatorInputOrLinearRegulatorinputfrom3.3Vto1.5VVD33_IOP42VDD3.3VforDigitalIOVDD_IO_1P55VDDforGPIO0~5,GPIO11VDD_IOP38VDDforGPIO9.EECS,CHIP_EN,GPIO6,GPIO7,GPIO13,GPIO14RTL8821CUDatasheetRTL8821CUDatasheetSingle-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE14Single-Chip802.11a/b/g/n/ac1T1RWLANControllerwithUSB2.0InterfacePAGE14TrackID: Rev.0.2r5SymbolTypePinNoDescriptionVD10D_WLP411.05VforWLANdigitalpowerVD10D_BTP541.05VforBTdigitalpowerGND_SPSP45SwitchingRegulatorGroundGNDP27GNDGND_V33USBP53USBGroundV10_USBP491.05VforUSBV33_USBP503.3VforUSBRREFP48PrecisionResistorforBandgapBT_VD105_RTXP13VDD1.05VforBTRFBT_VD33PAD_BTGP14VDD3.3VforBTPADBT_V105_LOBUFP11VDD1.05VforBTsynthesizerBT_VD33_SYNP12VDD3.3VforBTsynthesizerWLA_VD33_PAP23VDD3.3VforWLANPAWLG_VD33_PAP24VDD3.3VforWLANPAWL_VD105_RXAP21VDD1.05VforWLANRFWL_VD105_TRXP28VDD1.05VforWLANRFWL_VD1053_SYNP29VDD1.05VforWLANsynthesizerWL_VD33_SYNP30VDD3.3VforWLANsynthesizerVD33XP33VDD3.3VforcrystalVD10AP34VDD1.05VforcrystalTable9. PowerPinsElectricalandThermalCharacteristicsLimitRatingsParameterMinimumMaximumUnitsStorageTemperature-55+125CAmbientOperatingTemperature070CJunctionTemperature0125CTable10.TemperatureLimitRatingsDCCharacteristicsPowerSupplyCharacteristicsSymbolParameterMinimumTypicalMaximumUnitsVD333.3VI/OSupplyVoltage3.03.33.6VVD101.05VCoreSupplyVoltage0.9451.051.155VTable11.DCCharacteristicsDigitalIOPinDCCharacteristicsSymbolParameterMinimumNormalMaximumUnitsVIHInputhighvoltage2.03.33.6VVILInputlowvoltage--00.9VVOHOutputhighvoltage2.97--3.3VVOLOutputlowvoltage0--0.33V*3.3Vand1.2Vripple<100mV

Table12.3.3VGPIODCCharacteristicsInterfaceTimingSpecification TonTPOR TonTPOR TattachTk-state3.3VSE0ResetD+D-SE0ResetPORFigure3.RTL8821CU-CGUSBBusPowerOnSequenceTon:ThemainpowerrampupdurationTpor:ThepoweronresetreleasesandpowermanagementunitexecutespowerontasksTattach:USBattachstateTk-state:thedurationfromresisterattachedtoUSBhoststartingcarddetectionprocedureThepoweronflowdescription:Aftermain3.3Vrampup,theinternalpoweronresetisreleasedbypowerreadydetectioncircuitandthepowermanagementunitwillbeenabled.Thepowermanagementunitenablestheinternalregulatorandclockcircuits.ThepowermanagementunitalsoenablestheUSBcircuits.USBanalogcircuitsattachresisterstoindicatetheinsertionoftheUSBdeviceTonms--1.55Tporms--210Tattachms2715Tk-statems50250--Table13.ThetypicaltimingrangePCMInterfaceCharacteristicsTheRTL8821CU-CGsupportsaPCMdigitalaudiointerfacethatisusedfortransmittingdigitalaudio/voicedatato/fromtheAudioCodec.Featuresaresupportedasbelow:SupportsMasterandSlavemodeProgrammablelong/shortFrameSyncSupports8-bitA-law/µ-law,and13/16-bitlinearPCMformatsSupportssign-extensionandzero-paddingfor8-bitand13-bitsamplesSupportspaddingofAudioGainto13-bitsamplesPCMMasterClockOutput:64,128,256,or512kHzSupportsSCO/ESCOlinkPCMFormatFrameSyncisthesynchronizingfunctionusedtocontrolthetransferofDAC_DataandADC_Data.ALongFrameSyncindicatesthestartofADC_DataattherisingedgeofFrameSync(HYPERLINK