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6.18TCP2InputConfigurationRegister15(TCPIC15)
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Registers
TheTCP2inputconfigurationregister15(TCPIC15)isshowninFigure48anddescribedinTable22.
Figure48.TCP2InputConfigurationRegister15(TCPIC15)
3124230
ReservedEXT_SCALE_12_15
R/W-0R/W-0
LEGEND:R/W=Read/Write;R=Readonly;-n=valueafterreset
Table22.TCP2InputConfigurationRegister15(TCPIC15)FieldDescriptions
BitFieldValueDescription
31-24Reserved0Reserved.Thereservedbitlocationisalwaysreadas0.Avaluewrittentothisfield
hasnoeffect.
23-0EXT_SCALE_12_150-FFFFFFFFhExtrinsicscalefactor
23:18Extrinsicscalefactor15
17:12Extrinsicscalefactor14
11:6Extrinsicscalefactor13
5:0Extrinsicscalefactor12
The16extrinsicscaleregistersare6bitseachandhavea(1,5)fixed-pointprecision.Theunsigned
fixed-pointnumberscanrangefrom0.0to1.0.Forexample,0.5isequalto0.10000or0x10.These
registersareonlyusedife_max_staris0.Ife_max_staris1,thentheextrinsicscalefactoris
automaticallysettoa1.0.Theresetvalueforeachregisteris1.0or0x20.
The16extrinsicscaleregistersareselecteddependingontheiterationnumberandactiveMAPasshown
inTable23.MAP0isthenon-interleavedMAPdecodeandMAP1istheinterleavedMAPdecode.
Table23.ExtrinsicScaleRegisters
IterationNumberMAPExtrinsicScalingRegister
000
011
102
113
204
215
306
317
408
419
5010
5111
6012
6113
7014
7115
8015
8115
...
...
...
31115
SPRUGK1–March2009TMS320C6457Turbo-DecoderCoprocessor241
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