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6.3TCP2InputConfigurationRegister1(TCPIC1)
6.4TCP2InputConfigurationRegister2(TCPIC2)
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Registers
TheTCP2inputconfigurationregister1(TCPIC1)isshowninFigure34anddescribedinTable7.TCPIC1
configurestheTCP.
Figure34.TCP2InputConfigurationRegister1(TCPIC1)
31232216150
ReservedRReserved
R/W-0R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table7.TCP2InputConfigurationRegister1(TCPIC1)FieldDesccriptions
BitFieldValueDescription
31-23Reserved0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfieldhasnoeffect.
22-16R39-127Reliabilitylength+1:7bits(min=39,max=127).
14-0Reserved0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfieldhasnoeffect.
TheTCP2inputconfigurationregister2(TCPIC2)isshowninFigure35anddescribedinTable8.TCPIC2
configurestheTCP.
Figure35.TCP2InputConfigurationRegister2(TCPIC2)
312423212016
SNRReservedMAXIT
R/W-0R/W-0R/W-0
151487650
RsvdNSBReservedP
R/W-0R/W-0R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table8.TCP2InputConfigurationRegister2(TCPIC2)FieldDescriptions
BitFieldValueDescription
31-24SNR0-100SNRthreshold.SNRisusedforstoppingtest(8bits).Theturbodecodingwillstopassoonasthe
decodedsignalSNRratio>SNRthresholdratio.Themaximumvalueis100,givingavalueofzero
disablesthistestandthedecoderwillexecutethenumberofiterationsgivenintheabove
parameter.
0Disablesratiothreshold
1to100Enablesthresholdratio
23-21Reserved0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfieldhasnoeffect.
20-16MAXIT0-31Maximumnumberofiterations:5bits(0-31).0means32iterations.
0SetsMAXITto32.
15Reserved0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfieldhasnoeffect.
14-8NSB0-81Numberofsub-blocks.Forsharedprocessingmodeonly.
7-6Reserved0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfieldhasnoeffect.
5-0P4-48Prologlength(from4to48).Slidingwindowprologlength,maximumis48,minimumis4.In
shared-processingmode,theprologlengthmustbeamultipleof8,duetoEDMA3transfers
alignment.
SPRUGK1–March2009TMS320C6457Turbo-DecoderCoprocessor229
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