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10OutputParameters
11EventsGeneration
Write to
TCPEND
Write to
TCPEXE
Soft
reset
XEVT
Write
input
params
XEVT XEVT
Write
input
data coefficients
interleaver
Write
MAP0
decode
MAP
decode
REVT REVT XEVT
decisions
hard
Read
registers
Read
output
T
CPU/DMA
operations
TCP
operations
OutputParameters
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•TheEMAXSTRbitcanbeenabledordisabledinTCPIC3,0=maxstardisabled(enableMax
Log-MAP,1=maxstarenabled(enablelogMAP)).
•Theminimumnumberofiterations(MINITbitsinTCPIC3)shouldbeselectedasafunctionofthe
overallsystemperformance(minimumiterations1to31).
•TheINPUTSIGNbitcanbeenabledordisabledinTCPIC3(0=Usechannelinputdataasis,1=
multiplychannelinputdataby-1).
•TheOUTORDERbitcanbeenabledordisabledinTCPIC3(0=outputbitorderingfrom0to31,1=
outputbitorderingfrom31to0).
TheTAIL1,TAIL2,TAIL3,TAIL4,TAIL5,TAIL6bitsshouldbeprogrammedasdescribedinSection6.7
throughSection6.12,respectively.
Table45.InputConfigurationParametersSettingsinShared-Processing(SP)
Mode
BitfieldRegisterValue
OPMODTCPIC0OPMOD=2forfirstsubframe
OPMOD=4formiddlesubframe
OPMOD=6forlastsubframe
INTERTCPIC0INTER=0
OUTFTCPIC0OUTF=0
ThevariousoutputparametersaredescribedinSection6.19throughSection6.21.Theseparameters
provideusefulinformationwhenthestoppingcriteriaareenabled.
ATCP2transmitevent(TCPXEVT)andTCP2receiveevent(TCPREVT)aregeneratedasshownin
Figure100forstandalone(SA)modeandasshowninFigure101forshared-processing(SP)mode
(exampleof2subframes).
Figure100.TCP2EventsGenerationinStandalone(SA)Mode
TMS320C6457Turbo-DecoderCoprocessor2 74SPRUGK1–March2009
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