8B10B_Coding_VS_64B_66B_Coding

8B/10BCoding64B/66BCoding,TransmissionSystems8B/10BCoding64B/66BCodingCIPDemonstratorTestSetup,TransmissionsystemGeneral,Clock,Data,1Gbps=1ns=20cm,TransmissionsystemPropagationDelay,Clock,Data,Unequalpropagationdelay10cm1Gbps,TransmissionsystemClockDataRecovery,Clock,Data,CDR,IfthereareenoughedgesinthedatathentheclockcanberecoveredfromthedatausingaPLL,PLL,PLL,CombineClockandData!,CodeProperties,ProvideenoughedgesinthedatatoenableClockRecovery,TransmissionsystemReceiverThreshold,Clock,Data,CDR,ReceiverThresholdrefersto“Ground”whichmustbethesamepotentialas“Ground”atthetransmitter!,Jitter!,UseDifferentialsignalling!,Transmission,Clock,Data,CDR,ReceiverThresholdishalfwaypositiveandnegativesignal,Commonmodevoltagedifferencebetweentransmitterandterminationatthereceivercanresultinexcessivecurrents,Icm,UseACCouplingCapacitorsNeedDCBalance!,1,DCBalance,1,0,1,0,1,1,0,1,0,1,1,1,1,1,1,1,1,?,0,DefineamaximumRunLengthSentequalamountof1sand0s(RunningDisparity),ReceiverAutomaticGainControl,Gain,Time,Gain,Time,Again:maximumRunLength,CodeProperties,ProvideenoughedgesinthedatatoenableClockRecoveryMaximumRunLengthandDCBalance,Historyof8B/10Bcoding,8B/10Bcoding,Maximumrunlength=5RunningDisparity=DCBalance8bits=256differentvalues10bits=1024differentvalues8B10Bcodeisbuiltoutof:(5to6bitcode)+(3to4bitcode),8B/10Bcoding,Notall1024valuesareuseful.Forexample“0100000011”hasrunlength6Formostofthe256(8B)valuesapositiveandanegative10Bvalueisselecteddependingonthe“CurrentRunningDisparity”Forexample:D7.0=1110001011(CurrentRD-)D7.0=0001110100(CurrentRD+)Soabout512usefulvaluesareselectedfrom1024Therearestillafewcodesleft!,8B/10Bcodingtable,256“Data”Characters:,8B/10Bcodingtable,Therewerestillafewcodesleft!12“Special”KCharacters:,CommaCharacters“Theonlypatternsthathave5consecutive1sor0s,010101001101100111000001010110111010010100100111010011001001110100111001,8B/10Bcode“K”Characters,CommacharactersK28.1/K28.5/K28.7areusedwordalignment,010101001101100111000001010110111010010100100111010011001001110100111001,D31.3,D11.3,D0.0,K28.5,D16.2,Create“orderedsets”ForexampleFibreChannelStartOfFrame(SOF)=K28.5/D21.5/D23.0/D23.0K30.7=ErrorPropagateK28.3=CarrierExtend,?.?,8B/10Bcodeproperties,ProvideenoughedgesinthedatatoenableClockRecoveryMaximumRunLengthandDCBalanceAddspecialcharactersCommaforwordalignmentControlcharacters,64B/66BCoding,64B/66B(IEEEstd802.3ae-2002,Clause49),20%ofthebandwidthfor8B/10BisoverheadFor64B/66Boverheadis3%,2bitSyncHeader,64bit(Scrambled),2bitSyncHeader00CodeError0164bit=Datafield1064bit=MixedData/Controlfield11CodeError,Onceevery66bitsthereisatleasta“01”ora“10”transition=ReceiverBlockSync(itmaytakeawhile),64B/66BScrambler,Scrambler:X58+X39+1Triestomixupthedatatoavoidlongsequencesof1sand0sNote:thereisnoguaranteethatonabaddaytheoutputofthescramblerproducesall0sorall1s,1,0,D0:8,D1:8,D2:8,D3:8,D4:8,D5:8,D6:8,D7:8,64B/66B,0,1,64bitDataField(Scrambled),Typ:8,Z0:7,Z1:7,Z2:7,Z3:7,Z4:7,Z5:7,Z6:7,1,0,64bitMixedControl/DataField(Scrambled),Z7:7,PureControl(Type=0 x1E),Typ:8,1,0,MixedControl/Data(Type=0 x87;T0),Typ:8,Z2:7,Z3:7,Z4:7,Z5:7,Z6:7,Z7:7,1,0,Typ:8,Z3:7,Z4:7,Z5:7,Z6:7,1,0,Z7:7,Typ:8,Z4:7,Z5:7,Z6:7,1,0,Z7:7,Typ:8,Z5:7,Z6:7,1,0,Z7:7,Typ:8,Z6:7,Z7:7,7,Z1:7,Z2:7,Z3:7,Z4:7,Z5:7,Z6:7,Z7:7,6,D0:8,D0:8,D1:8,5,D0:8,D1:8,D2:8,4,D0:8,D1:8,D2:8,D3:8,3,D0:8,D1:8,D2:8,D3:8,D4:8,2,Totalof15MixedControl/DataFieldisdefined,MixedControl/Data(Type=0 x99;T1),MixedControl/Data(Type=0 xaa;T2),MixedControl/Data(Type=0 xb4;T3),MixedControl/Data(Type=0 xcc;T4),MixedControl/Data(Type=0 xd2;T5),etc.,PureData,2bitSyncHeader,64bit(Scrambled),64B/66BExample,0,1,Z5,Z6,Z7,D0,D1,D2,D3,D4,D5,D6,D7,T,1,0,D0,D1,D2,Z4,Z5,Z6,Z7,Transmittingasequenceof18bytescouldlooklike:,T,1,0,D1,D2,D3,D4,D5,D6,D7,0 x78:S0Start,0 xB4:T3Terminate,PureDataFrame,64B/66BPhysicalCodingSublayer(PCS)Transmitbitordering,Tx_Data(0),Tx_Data(15),GearboxAdaptsbetween(4x16=)64bitwidthand66bitwidthframes,Comparison,CIPDemonstratorTestSetup,CIPTestBed,Delay?,Tx8B/10BEncoded,Rx8B/10BEncoded,CIPDemonstratorTestSetup,K28.5,D16.2,K23.7,Dx.y,IDLE,CharExt,Tx8B/10BEncoded,K28.5,D16.2,K28.5,D16.2,IDLE,IDLE,K28.5,D16.2,K28.5,D16.2,IDLE,IDLE,K28.5,D16.2,K23.7,Dx.y,IDLE,CharExt,K28.5,D16.2,K28.5,D16.2,IDLE,IDLE,K28.5,D16.2,IDLE,K28.5,D16.2,IDLE,Start,Stop,StanfordResearch,2x10Kmfiber100us2x100Kmfiber1ms,100Hz,Rx8B/10BEncoded,FirstRes