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9.2.1.3InterleaverIndexesTransfer
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Programming
–TCINTEN=0(Transfercompleteinterruptisdisabled)
–TCC=1to63(TransferCompleteCode)
–TCCMODE=0(NormalCompletion)
–FWID=Don'tcare
–STAT=0(Entryisupdatedasnormal)
–SYNCDIM=0(AB-Sync,EacheventtriggersthetransferofBCNTarraysofACNTelements.)
–DAM=0(Dstaddressingwithinanarrayincrements.DstisnotaFIFO.)
–SAM=0(Srcaddressingwithinanarrayincrements.SourceisnotaFIFO.)
•SOURCEADDRESS:Systematicsandparitiesstartaddress(mustbedouble-wordaligned)
•ACNT=8*ceil(frame_length/2)
•BCNT=1(NoofarraysoflengthACNT)
•DESTINATIONADDRESS:TCPSP(50010000h)
•SRCBIDX=0(Source2ndDimensionIndex)
•DSTBIDX=0(Destination2ndDimensionIndex)
•SRCCIDX=0(Source3rdDimensionIndex)
•DSTCIDX=0(Destination3rdDimensionIndex)
•CCNT=1(Noofframesinablock)
•BCNTRLD:Don'tcare
•LINKADDRESS:AddressintheEDMA3PaRAMoftheEDMA3parametersassociatedwiththe
systematicsandparities.
1.TheEDMA3interleavertabletransferparameters,ifthereisanewonetobeloadedintheTCP2
(INTERbitisset)
2.TheEDMA3inputconfigurationparameterstransferparametersofthenextuser-channel,ifthereis
onereadytobedecodedandnointerleavertabletobeloadedintheTCP2(INTERbitiscleared)
3.DummyDMAtransferparameters,iftherearenomoreuserchannelsreadytobedecoded[for
informationonhowtosetupadummyXfer,seetheTMS320C6457DSPEnhancedDirectMemory
Access(EDMA3)ControllerReferenceGuide(SPRUGK6)].DonotlinktoaNULLtransfer,asthe
secondaryeventregistersetstheeventflagforEvent29.ThefinalTCPXEVTisgenerateduponthe
readingofthedecisionsandoutputregisters,whichisintendedtotransfertheinputconfigurationof
thenextuserchannel.IfaNULLtransferlinkisinplace,thefinalTCPXEVTwillsettheevent29flag
ofSERandnofurtherTCPexecutionwilloccuruntilitiscleared.
ThisEDMA3transfertotheinterleavermemoryisaTCPXEVTframe-synchronizedtransfer.The
parametersshouldbesetas:
•OPTIONS:
–ITCCEN=0(Intermediatetransfercompletechainingisdisabled)
–TCCEN=0(Transfercompletechainingisdisabled)
–ITCINTEN=0(Intermediatetransfercompleteinterruptisdisabled)
–TCINTEN=1(Transfercompleteinterruptisenabled)
–TCC=1to63(TransferCompleteCode)
–TCCMODE=0(NormalCompletion)
–FWID=Don'tcare
–STAT=0(Entryisupdatedasnormal)
–SYNCDIM=0(A-Sync.EacheventtriggersthetransferofACNTelements.)
–DAM=0(Dstaddressingwithinanarrayincrements.DstisnotaFIFO.)
–SAM=0(Srcaddressingwithinanarrayincrements.SourceisnotaFIFO.)
•SOURCEADDRESS:Interleavertablestartaddress(mustbedouble-wordaligned)
•ACNT=8*ceil((frame_length+3)/4))⇒(Noofbytesinanarray)
•BCNT=1(NoofarraysoflengthACNT)
•DESTINATIONADDRESS:TCPINTER(50050000h)
SPRUGK1–March2009TMS320C6457Turbo-DecoderCoprocessor267
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