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9.2.1.4Hard-DecisionsTransfer
Programming
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•SRCBIDX=0(Source2ndDimensionIndex)
•DSTBIDX=0(Destination2ndDimensionIndex
•SRCCIDX=0(Source3rdDimensionIndex)
•DSTCIDX=0(Destination3rdDimensionIndex)
•CCNT=1(Noofframesinablock)
•BCNTRLD:Don'tcare
•LINKADDRESS:Seecases1and2below
Uponcompletion,thisEDMA3transferislinkedtooneofthefollowing:
1.TheEDMA3inputconfigurationparameterstransferparametersofthenextuser-channel,ifthereis
onereadytobedecoded
2.DummyDMAtransferparameters,iftherearenomoreuserchannelsreadytobedecoded[for
informationonhowtosetupadummyXfer,seetheTMS320C6457DSPEnhancedDirectMemory
Access(EDMA3)ControllerReferenceGuide(SPRUGK6)].DonotlinktoaNULLtransfer,asthe
secondaryeventregistersetstheeventflagforEvent29.ThefinalTCPXEVTisgenerateduponthe
readingofthedecisionsandoutputregisters,whichisintendedtotransfertheinputconfigurationof
thenextuserchannel.IfaNULLtransferlinkisinplace,thefinalTCPXEVTwillsettheevent29flag
ofSERandnofurtherTCPexecutionwilloccuruntilitiscleared.
ThisEDMA3transfertotheharddecisionsbufferisaTCPREVTframe-synchronizedtransfer.The
parametersshouldbesetas:
•OPTIONS:
–ITCCEN=0(Intermediatetransfercompletechainingisdisabled)
–TCCEN=0(Transfercompletechainingisdisabled)
–ITCINTEN=0(Intermediatetransfercompleteinterruptisdisabled)
–TCINTEN=0(Transfercompleteinterruptisdisabled)
–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:TCPHD(50060000h)
•ACNT=8*ceil(frame_length/64)⇒(Noofbytesinanarray.Notethatthisimpliesthatthe
destinationlocationmusthave8*ceil(frame_length/64)bytesallocatedfordecisions.)
•BCNT=1(NoofarraysoflengthACNT)
•DESTINATIONADDRESS:Userharddecisionsstartaddress(mustbedouble-wordaligned)
•ELEMENTINDEX:Don'tcare
•SRCBIDX=0(Source2ndDimensionIndex)
•DSTBIDX=0(Destination2ndDimensionIndex)
•SRCCIDX=0(Source3rdDimensionIndex)
•DSTCIDX=0(Destination3rdDimensionIndex)
•CCNT=1(Noofframesinablock)
•BCNTRLD:Don'tcare
•LINKADDRESS:Seecases1,2,and3below
Uponcompletion,thisEDMA3transferislinkedtooneofthefollowing:
1.TheEDMA3harddecisionstransferparametersofthenextuser-channel,ifthereisonereadytobe
decodedandtheOUTFbitiscleared.
2.TheEDMA3outputparameterstransferparameters,iftheOUTFbitisset.
68TMS320C6457Turbo-DecoderCoprocessor2SPRUGK1–March2009
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