Introduction-OF-C-PHY

2018.01I.D-PHYvsC-PHY?1.CPHYvsDPHYDataRateComparisonTXHSTX#ofpinsEncoderSerializerBWDPHY-2lane3602(8to1)2.5G*2=5GbpsCPHY–2Trio1626(7to1)2.5G*2.28*2=11.4GbpsLessorsimilarcurrentconsumptioninanalogsupplydomain.(HS-TX,pre-driver)Littlehighercurrentconsumptionindigitalsupplydomainduetomorecircuits&higherfrequency.(encoder/serializer)D-PHY,diff-pairs,sourcesynchronous,nocodingC-PHY,3-wire,embeddedclock,3-phasecoding2.D-PHYvsC-PHYConfigurationDataClockDataABC3.CompareofCPHYEye-diagramTheencodingallowsdatatobesent~2.28xfasterthanthesignaltransitionrate•e.g.atriothatchangesat109timespersecond,cansenddataat~2.28·109bitspersecond•~2.28bitsaretransmittedinthetrioineverysymbol•Theoreticalspeedincreasefactorislog2(5)2.3219•Practicalusablespeedincreasefactoris16/72.2857[bysending16bitsin7symbols]ThedataisextractedinthreeWirestates,theWirestateshouldbefollowthebelow,-Threewires(A,B,C)mustcontainsallthreestates.(High,Middle,Low)-ThreewirestatescannotcomewiththesamevaluecontinuouslyThreewires(A,B,C),Threestates,Itcanrepresent27(3e3=27)states,butinC-PHY’sitonlyuses6states.Thereasonisthattherearesixstateswherethreewirescanincludethreestates,asdescribedabove.-Thesignalingside(TX)sendssignalstofitthesesixstates,Thereceivingside’storecognizeasdifferentsignalsaslikeotherwires.-Asshownbelow,eachwireisconvertedintoasignalofAB,BC,CA3bitcomparedtotwootherwires4.Three-PhaseEncoding1.Wiredifferential-ItisadifferentsignalvaluecomparingthestateofeachWiretothestateoftheotherWire.-ThecomparisonconditionisAB,B.C,CA,3-Caseintotal.2.WireStates(3bit)-Thisisavaluethatrepresentsthewirelessstatevalueas3bit.-ABishigher,BC’smiddlebit,CAisbottombit-Thisvalueisawirelessstatename(+x,-x,+y,-y,+z,-z)expressed.-Inthepicture,thevalueoftheWireState656346536canbedenotedas-z,–y,–z,–x,+x,–z,–y,–x,–z,WireStateNameRepresentation.3.Symbol(3bits)-SymbolisdataextractedfromthecurrentWireStatetothenextWireState.-WireStateshaveatotalofsixstates,andbecauseacontinuousStatecannotcome,thevaluechangestofiveStates,exceptforyourself.Atthistime,theSymbolvalueisdetermineddependingontheconditionthattheWireStateNameischanged,andtheconditionfordeterminingtheSymbolvalueisreferredtoabovefigure.a.Flip:onlysymbolschangeinthesamecharacter(+x=-x)b.Rotate:thenumberofcharactersincreasestothefollowingcharacters(+-x=+-y,+-y=+-z,+-z=+-x)c.Polarity:characterchangesandthesignchanges(+x=-y,+x=-z,-y=+z,+y=-z)Therefore,theWireStatevalue656346536(-zyzx+xzyxz)totheSymbolvalueandconvertedtosevenSymbolvaluescalled0224100.4325164-1.EncodingExampleWesummarizethevaluesinwhichsixwirelessstateschangetodifferentsignals,likethetablebelow,Thesesixdifferentvalues+x,-x,-y,-y,+z,-z.4.Integers(16bit)-The7-digitSymbolvalueismappedtothe16-bitintegervalue.-SincetheSymbolvalueis7digitsatavalueof0to4,theremaybeupto78125values.(5e7)Thedecimal65536,suchasthebinary16bitused16bitintegervaluesandonetoonemappingvalues.Theremaining12589valuesareusedasmarkervalues,etc.4-1.EncodingExample-Flip:Signchangesinthesamecharacter+x=-x-Rotation:changetheonlycharacter+-x=+-y,+-y=+-z,+-z=+-x-Polarity:Characterchangeandsignchange+x=-y,+x=-z,-y=+z,+y=-z4-2.PhaseRotation4-3.C-PHYvsD-PHYchannelstateCPHYChannelstateDPHYChannelstateCPHYspecificationSummaryDPHYDDRDPHY:Romannumeralfor500orDDifferentialsignalSkewcalibrationLPmode(ALPsupport)ULPS(UltraLowPowerState)NoEncoderCPHYEmbeddedclockCPHY:channel-limited,useofthe‘C’Singleendedsignal(butreceivedusingdifferentialreceivers)Skewcalibration(Cal.Preamble)LPmode(ALPsupport)ULPS(UltraLowPowerState)Newencodingschemetoincreasethenumberofbitspersymbol(~2.28bit/symbol)5.C-PHYvsD-PHYarchitectureCPHYarchitectureDPHYarchitecture6.D-PHY&C-PHYGlobalTimingSimilarsignalinggoingintoandoutofHSMode.6.C-PHYvsD-PHYLinelevelsinHSandLPmodesCPHYlinelevelsDPHYlinelevels7.C-PHYTXDriverandWaveformSimulation&SiliconTestResult8.RoadmapD-PHYvsC-PHYDPHYv3.0short:14Gbps/lane,std:12Gbps/laneCPHYv2.0short:8Gsps/lane,std:6Gsps/laneII.CPHYChannelguide1.RealchannellengthforthePhoneset1.RealchannellengthforthePhonesetAP’sRXSensor’sTXEquivalentCircuitModelforTransmissionlineSensor’sTXAP’sRXCPHYSignalIntegrity白油白油块15-30um258.80.05LPISolderMaskerOil20um25254.90.031MHz镀铜CopperPlating20um2020///基材L1L1Conductor(ED)12um1212///PPPP80um80803.80.0161GHzEMISF-PC600016um16PolyimideFilm12.5um12.512.512.53.60.0161GHzAdhesive(扣除溢胶量20%)15um121212///L2Conductor(HA)12um121212///PIbaseFilm25um2525253.40.0071GHzL3Conductor(HA)12um121212///Adhesive(扣除溢胶量20%)15um121212///PolyimideFilm12.5um12.512.512.53.60.0161GHzEMISF-PC600016um16PPPP80um80803.80.0161GHz基材L4L4Conductor(ED)12um1212///镀铜CopperPlating20um2020///LPISolderMaskerOil20um25254.90.031MHz总厚度1303723970.13±0.050.35±0.050.38±0.05N/AN/AN/A是否有棕化NO是否选镀NOTYPE1(μm)FPC区TYPE2(μm)W/B区TYPE3(μm)连接器区DKFrequency.[Hz]DFTotalThickness(μm)客户要求(mm)奈电建议(mm)层别覆盖膜L2基材L2L3覆盖膜L3BODYSIDE厚度(Thickness)Type2Type1Module+FPCB1.MinimumimplementationofFPCBsection(microstrip)inthemoduleStackUp?Thisisthe1stnecessaryitem!!MainTESTBoardCPHYSignalIntegrityMainBoardThisisthe2ndnecessaryitem!!2.Minimumimpl