Texas Instruments TMS320C6457 DSP 18 TCP2 Input Configuration Register 15 TCPIC15, EXTSCALE1215

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Registers

6.18 TCP2 Input Configuration Register 15 (TCPIC15)

The TCP2 input configuration register 15 (TCPIC15) is shown in Figure 48 and described in Table 22.

Figure 48. TCP2 Input Configuration Register 15 (TCPIC15)

31	24	23	0
	Reserved		EXT_SCALE_12_15
	R/W-0		R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

Table 22. TCP2 Input Configuration Register 15 (TCPIC15) Field Descriptions

Bit	Field	Value	Description
31-24	Reserved	0	Reserved. The reserved bit location is always read as 0. A value written to this field
			has no effect.
23-0	EXT_SCALE_12_15	0-FFFF FFFFh	Extrinsic scale factor
		23:18	Extrinsic scale factor 15
		17:12	Extrinsic scale factor 14
		11:6	Extrinsic scale factor 13
		5:0	Extrinsic scale factor 12

The 16 extrinsic scale registers are 6 bits each and have a (1,5) fixed-point precision. The unsigned fixed-point numbers can range from 0.0 to 1.0. For example, 0.5 is equal to 0.10000 or 0x10. These registers are only used if e_max_star is 0. If e_max_star is 1, then the extrinsic scale factor is automatically set to a 1.0. The reset value for each register is 1.0 or 0x20.

The 16 extrinsic scale registers are selected depending on the iteration number and active MAP as shown in Table 23. MAP 0 is the non-interleaved MAP decode and MAP1 is the interleaved MAP decode.

Table 23. Extrinsic Scale Registers

Iteration Number	MAP	Extrinsic Scaling Register
0	0	0
0	1	1
1	0	2
1	1	3
2	0	4
2	1	5
3	0	6
3	1	7
4	0	8
4	1	9
5	0	10
5	1	11
6	0	12
6	1	13
7	0	14
7	1	15
8	0	15
8	1	15
.	.	.
.	.	.
.	.	.
31	1	15
SPRUGK1–March 2009		TMS320C6457 Turbo-Decoder Coprocessor 2	41

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Contents Users Guide Submit Documentation Feedback Contents Added Features Programming EDMA3 Resources List of Figures Destination of Endianness Manager Outorder = List of Tables Notational Conventions About This ManualRelated Documentation From Texas Instruments TrademarksTMS320C6457 Turbo-Decoder Coprocessor FeaturesIntroduction GPP and IS2000 Turbo-Encoder Block DiagramOverview GPP and IS2000 Turbo-Decoder Block DiagramTCP2 Mode Standalone SA ModeSystematic and Parity Data Input Data FormatSP9 SP8 SP7 SP6 SP5 SP4 SP3 SP0 Rsvd SP9 SP8 SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0SP4 SP3 SP2 SP1 SP0 SP9 SP8 SP7 SP6 SP5 SP9 SP8 SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0EN = 0 Big-Endian Mode Rate = 1/4 Stopping Criteria Output Decision Data FormatInterleaver Indexes Interleaver DataCRC Termination Stopping Test UnitSNR Threshold Termination Parameter Termination Shared-Processing SP ModeMaximum Iterations Minimum IterationsShared-Processing SP Mode Block Diagram Subframe Equations Submit Documentation Feedback TCP2 Shared Processing Block Diagram EN = 1 Little-Endian Mode Rate = 1/3 Rsvd AP4 AP3 AP2 AP1 AP0 AP9 AP8 AP7 AP6 AP5 Output Data FormatPriori Data TCP2 Registers RegistersTCP2 RAMs NameRegisters Peripheral Identification Register PID Field Descriptions Peripheral Identification Register PIDBit Field DescriptionBit Field Value Description TCP2 Input Configuration Register 0 TCPIC0TCP2 Input Configuration Register 2 TCPIC2 TCP2 Input Configuration Register 1 TCPIC1SNR MaxitTCP2 Input Configuration Register 3 TCPIC3 Crclen TCP2 Input Configuration Register 4 TCPIC4Crciterpass Tail Symbols TCP2 Input Configuration Register 5 TCPIC5CRC Examples CrcpolyTAIL1 TCP2 Input Configuration Register 6 TCPIC6TAIL2 10 TCP2 Input Configuration Register 7 TCPIC7TAIL3 11 TCP2 Input Configuration Register 8 TCPIC8TAIL4 12 TCP2 Input Configuration Register 9 TCPIC9TAIL5 13 TCP2 Input Configuration Register 10 TCPIC1014 TCP2 Input Configuration Register 11 TCPIC11 TCP2 Input Configuration Register 11 TCPIC11 16 TCP2 Input Configuration Register 13 TCPIC13 15 TCP2 Input Configuration Register 12 TCPIC12EXTSCALE03 EXTSCALE47EXTSCALE811 17 TCP2 Input Configuration Register 14 TCPIC14Extrinsic Scale Registers 18 TCP2 Input Configuration Register 15 TCPIC15EXTSCALE1215 Iteration Number20 TCP2 Output Parameter Register 1 TCPOUT1 19 TCP2 Output Parameter Register 0 TCPOUT0TCP2 Output Parameter Register 0 TCPOUT0 Field Descriptions TCP2 Output Parameter Register 1 TCPOUT1 Field Descriptions22 TCP2 Execution Register Tcpexe 21 TCP2 Output Parameter Register 2 TCPOUT2TCP2 Output Parameter Register 2 TCPOUT2 Field Descriptions TCP2 Execution Register Tcpexe Field DescriptionsTCP2 Endian Register Tcpend Field Descriptions 23 TCP2 Endian Register TcpendEndian Extr Intr EndianextrTCP2 Error Register Tcperr Field Descriptions 24 TCP2 Error Register TcperrSubframe length Tcpstate 25 TCP2 Status Register TcpstatTCP2 Status Register Tcpstat Field Descriptions Waiting for RAM extrinsic memory 0 to be read TCP2 Emulation Register Tcpemu Field Descriptions 26 TCP2 Emulation Register TcpemuSoft = Soft FreeData Memory for Systematic Endianness6362 6156 5550 4944 4338 3732 3130 2924 2318 1712 116 Data MemoryEN = 0 Big-Endian Mode Rate = 1/4 Hard Decision Data EN = 0 Big-Endian Mode Rate = 3/4Tcpendian Register for Endianness Manager Hard Decisions in DSP MemoryData HD1 HD0Endianintr = Tcpendian Programming RegisterInterleaver Indexes in DSP Memory Data Native Format DSP Memory FormatINTER3 INTER2 INTER1 INTER0 INTER0 INTER1 INTER2 INTER3Extrinsic in DSP Memory Endianextr = Extrinsic DataEndianextr = Data Source Kernel Endianextr = EXT3 EXT2 EXT1 EXT0 EXT7 EXT6 EXT5 EXT4 ArchitectureEXT7 EXT6 EXT5 EXT4 EXT3 EXT2 EXT1 EXT0 Sub-block and Sliding Window Segmentation MAP Unit Block DiagramExamples for NUMBLOCK, NUMSUBBLOCK, NUMSW, and Winrel Subframe Segmentation SP mode onlyReliability and Prolog Length Calculation Code Rates Added FeaturesProgramming Valid Re-Encode Symbols Used for ComparisonInput Sign Log EquationEDMA3 Parameters in Shared Processing SP Mode EDMA3 Parameters in Standalone SA ModeEDMA3 Resources 1 TCP2 Dedicated EDMA3 ResourcesInput Configuration Parameters Transfer Programming Standalone SA ModeEDMA3 Programming Systematics and Parities TransferInterleaver Indexes Transfer Hard-Decisions Transfer Output Parameters Transfer Input Configurations Parameters ProgrammingOpmod TCPIC0 Programming Shared-Processing SP ModeInter TCPIC0 Outf TCPIC0Input Configuration Parameters Transfer Priori Transfer Extrinsics Transfer Inter TCPIC0 Inter = Outf Output ParametersEvents Generation Errors and Status Debug Mode Pause After Each MapErrors Error Status ERRUnexpected Memory Access ACC Unexpected Signal to Noise Ratio SNRUnexpected Frame Length F Unexpected Prolog Length PStatus 13.2.13 TCP2 Active Iteration Status Activeiter 13.2.12 TCP2 Active State Status Activestate13.2.14 TCP2 SNR Status snrexceed 13.2.15 TCP2 CRC Status CrcpassRfid Products ApplicationsDSP