About This Manual, Trademarks | Texas Instruments TMS320C6457 DSP

Preface

SPRUGK1–March 2009

Read This First

About This Manual

Channel decoding of high bit-rate data channels found in third-generation (3G) cellular standards requires decoding of turbo-encoded data. The turbo-decoder coprocessor (TCP2) in some of the digital signal processors (DSPs) of the TMS320C6000™ DSP family has been designed to perform this operation for IS2000 and 3GPP wireless standards. This document describes the operation and programming of the TCP2 for the TMS320C6457 DSPs.

Notational Conventions

This document uses the following conventions.

∙Hexadecimal numbers are shown with the suffix h. For example, the following number is 40 hexadecimal (decimal 64): 40h.

∙Registers in this document are shown in figures and described in tables.

–Each register figure shows a rectangle divided into fields that represent the fields of the register. Each field is labeled with its bit name, its beginning and ending bit numbers above, and its read/write properties below. A legend explains the notation used for the properties.

–Reserved bits in a register figure designate a bit that is used for future device expansion.

∙The term "word" describes a 32-bit value. The term "halfword" describes a 16-bit value.

Related Documentation From Texas Instruments

The following documents describe the C6000™ devices and related support tools. Copies of these documents are available on the Internet at www.ti.com. Tip: Enter the literature number in the search box provided at www.ti.com.

SPRU189 — TMS320C6000 DSP CPU and Instruction Set Reference Guide. Describes the CPU architecture, pipeline, instruction set, and interrupts for the TMS320C6000 digital signal processors (DSPs).

SPRU198 — TMS320C6000 Programmer's Guide. Describes ways to optimize C and assembly code for the TMS320C6000™ DSPs and includes application program examples.

SPRU301 — TMS320C6000 Code Composer Studio Tutorial. Introduces the Code Composer Studio™ integrated development environment and software tools.

SPRU321 — Code Composer Studio Application Programming Interface Reference Guide. Describes the Code Composer Studio™ application programming interface (API), which allows you to program custom plug-ins for Code Composer.

SPRU871 — TMS320C64x+ Megamodule Reference Guide. Describes the TMS320C64x+ digital signal processor (DSP) megamodule. Included is a discussion on the internal direct memory access (IDMA) controller, the interrupt controller, the power-down controller, memory protection, bandwidth management, and the memory and cache.

Trademarks

TMS320C6000, C6000, Code Composer Studio are trademarks of Texas Instruments.

All other trademarks are the property of their respective owners.

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Texas Instruments TMS320C6457 DSP About This Manual, Notational Conventions, Related Documentation From Texas Instruments

Contents

Users Guide Submit Documentation Feedback Contents Added Features Programming EDMA3 Resources List of Figures Destination of Endianness Manager Outorder = List of Tables About This Manual Notational ConventionsRelated Documentation From Texas Instruments Trademarks Features TMS320C6457 Turbo-Decoder Coprocessor GPP and IS2000 Turbo-Encoder Block Diagram Introduction GPP and IS2000 Turbo-Decoder Block Diagram Overview Standalone SA Mode TCP2 Mode Input Data Format Systematic and Parity Data Rsvd SP9 SP8 SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SP9 SP8 SP7 SP6 SP5 SP4 SP3 SP0SP4 SP3 SP2 SP1 SP0 SP9 SP8 SP7 SP6 SP5 SP9 SP8 SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 EN = 0 Big-Endian Mode Rate = 1/4 Output Decision Data Format Stopping CriteriaInterleaver Indexes Interleaver Data CRC Termination Stopping Test UnitSNR Threshold Termination Shared-Processing SP Mode Parameter TerminationMaximum Iterations Minimum Iterations Shared-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 Registers TCP2 RegistersTCP2 RAMs Name Registers Peripheral Identification Register PID Peripheral Identification Register PID Field DescriptionsBit Field Description TCP2 Input Configuration Register 0 TCPIC0 Bit Field Value Description TCP2 Input Configuration Register 1 TCPIC1 TCP2 Input Configuration Register 2 TCPIC2SNR Maxit TCP2 Input Configuration Register 3 TCPIC3 Crclen TCP2 Input Configuration Register 4 TCPIC4Crciterpass TCP2 Input Configuration Register 5 TCPIC5 Tail SymbolsCRC Examples Crcpoly TCP2 Input Configuration Register 6 TCPIC6 TAIL1 10 TCP2 Input Configuration Register 7 TCPIC7 TAIL2 11 TCP2 Input Configuration Register 8 TCPIC8 TAIL3 12 TCP2 Input Configuration Register 9 TCPIC9 TAIL4 TAIL5 13 TCP2 Input Configuration Register 10 TCPIC1014 TCP2 Input Configuration Register 11 TCPIC11 TCP2 Input Configuration Register 11 TCPIC11 15 TCP2 Input Configuration Register 12 TCPIC12 16 TCP2 Input Configuration Register 13 TCPIC13EXTSCALE03 EXTSCALE47 17 TCP2 Input Configuration Register 14 TCPIC14 EXTSCALE811 18 TCP2 Input Configuration Register 15 TCPIC15 Extrinsic Scale RegistersEXTSCALE1215 Iteration Number 19 TCP2 Output Parameter Register 0 TCPOUT0 20 TCP2 Output Parameter Register 1 TCPOUT1TCP2 Output Parameter Register 0 TCPOUT0 Field Descriptions TCP2 Output Parameter Register 1 TCPOUT1 Field Descriptions 21 TCP2 Output Parameter Register 2 TCPOUT2 22 TCP2 Execution Register TcpexeTCP2 Output Parameter Register 2 TCPOUT2 Field Descriptions TCP2 Execution Register Tcpexe Field Descriptions 23 TCP2 Endian Register Tcpend TCP2 Endian Register Tcpend Field DescriptionsEndian Extr Intr Endianextr 24 TCP2 Error Register Tcperr TCP2 Error Register Tcperr Field Descriptions Subframe length Tcpstate 25 TCP2 Status Register TcpstatTCP2 Status Register Tcpstat Field Descriptions Waiting for RAM extrinsic memory 0 to be read 26 TCP2 Emulation Register Tcpemu TCP2 Emulation Register Tcpemu Field DescriptionsSoft = Soft Free Endianness Data Memory for Systematic Data Memory 6362 6156 5550 4944 4338 3732 3130 2924 2318 1712 116 EN = 0 Big-Endian Mode Rate = 1/4 EN = 0 Big-Endian Mode Rate = 3/4 Hard Decision Data Hard Decisions in DSP Memory Tcpendian Register for Endianness ManagerData HD1 HD0 Tcpendian Programming Register Endianintr =Interleaver Indexes in DSP Memory Data Native Format DSP Memory Format INTER0 INTER1 INTER2 INTER3 INTER3 INTER2 INTER1 INTER0 Extrinsic 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 MAP Unit Block Diagram Sub-block and Sliding Window Segmentation Subframe Segmentation SP mode only Examples for NUMBLOCK, NUMSUBBLOCK, NUMSW, and Winrel Reliability and Prolog Length Calculation Added Features Code Rates Valid Re-Encode Symbols Used for Comparison ProgrammingInput Sign Log Equation EDMA3 Parameters in Standalone SA Mode EDMA3 Parameters in Shared Processing SP ModeEDMA3 Resources 1 TCP2 Dedicated EDMA3 Resources Programming Standalone SA Mode Input Configuration Parameters TransferEDMA3 Programming Systematics and Parities Transfer Interleaver Indexes Transfer Hard-Decisions Transfer Input Configurations Parameters Programming Output Parameters Transfer Programming Shared-Processing SP Mode Opmod TCPIC0Inter TCPIC0 Outf TCPIC0 Input Configuration Parameters Transfer Priori Transfer Extrinsics Transfer Inter TCPIC0 Inter = Outf Output ParametersEvents Generation Debug Mode Pause After Each Map Errors and StatusErrors Error Status ERR Unexpected Signal to Noise Ratio SNR Unexpected Memory Access ACCUnexpected Frame Length F Unexpected Prolog Length P Status 13.2.12 TCP2 Active State Status Activestate 13.2.13 TCP2 Active Iteration Status Activeiter13.2.14 TCP2 SNR Status snrexceed 13.2.15 TCP2 CRC Status Crcpass Rfid Products ApplicationsDSP