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9.2ProgrammingStandalone(SA)Mode
9.2.1EDMA3Programming
9.2.1.1InputConfigurationParametersTransfer
9.2.1.2SystematicsandParitiesTransfer
Programming
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Table42highlightstherequiredEDMA3resourcestoperformastandalone(SA)modedecoding.Each
setofEDMA3parametersusestheEDMA3linkingcapabilities.Section9.2.1detailstheEDMA3transfers
programmingandSection9.2.2detailstheinputparametersprogramming.Anynotificationmechanismto
flagthatauser-channelhasjustbeendecodedislefttoyou.Suggestedimplementationistousethe
EDMA3interruptgenerationcapabilities[seetheTMS320C6457DSPEnhancedDirectMemoryAccess
(EDMA3)ControllerReferenceGuide(SPRUGK6)]andprogramtheEDMA3togenerateaninterruptafter
theuser-channel'slastTCPREVTsynchronizedEDMA3transferhascompleted.
ThisEDMA3transfertotheinputconfigurationparametersisa16-wordTCPXEVTframesynchronized
transfer.Theparametersshouldbesetas:
•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:Userinputconfigurationparametersstartaddress(mustbedouble-word
aligned)
•ACNT=64(Noofbytesinanarray-1632bitInputConfigurationstobetransferred)
•BCNT=1(NoofarraysoflengthACNT)
•DESTINATIONADDRESS:TCPIC0(50000000h)
•SRCBIDX=0(Source2ndDimensionIndex)
•DSTBIDX=0(Destination2ndDimensionIndex)
•SRCCIDX=0(Source3rdDimensionIndex)
•DSTCIDX=0(Destination3rdDimensionIndex)
•CCNT=1(Noofframesinablock)
•BCNTRLD:Don'tcare
•LINKADDRESS:AddressintheEDMA3PaRAMoftheEDMA3parametersassociatedwiththe
systematicsandparities
Uponcompletion,thisEDMA3transferislinkedtotheEDMA3forsystematicsandparitiestransfer
parameters.
ThisEDMA3transfertothesystematicsandparitiesmemoryisaTCPXEVTframe-synchronizedtransfer.
Theparametersshouldbesetas:
•OPTIONS:
–ITCCEN=0(Intermediatetransfercompletechainingisdisabled)
–TCCEN=0(Transfercompletechainingisdisabled)
–ITCINTEN=0(Intermediatetransfercompleteinterruptisdisabled)
66TMS320C6457Turbo-DecoderCoprocessor2SPRUGK1–March2009
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