TMS320C6455
www.ti.com
SPRS276M –MAY 2005–REVISED MARCH 2012
7.16 Enhanced Viterbi-Decoder Coprocessor (VCP2)
7.16.1 VCP2 Device-Specific Information
The C6455 device has a high-performance embedded coprocessor [Viterbi-Decoder Coprocessor (VCP2)
that significantly speeds up channel-decoding operations on-chip. The VCP2 operating at CPU clock
divided-by-4 can decode over 694 7.95-Kbps adaptive multi-rate (AMR) [K = 9, R = 1/3] voice channels.
The VCP2 supports constraint lengths K = 5, 6, 7, 8, and 9, rates R = 3/4, 1/2, 1/3, 1/4, and 1/5, and
flexible polynomials, while generating hard decisions or soft decisions. Communications between the
VCP2 and the CPU are carried out through the EDMA3 controller.
The VCP2 supports:
• Unlimited frame sizes
• Code rates 3/4, 1/2, 1/3, 1/4, and 1/5
• Constraint lengths 5, 6, 7, 8, and 9
• Programmable encoder polynomials
• Programmable reliability and convergence lengths
• Hard and soft decoded decisions
• Tail and convergent modes
• Yamamoto logic
• Tail biting logic
• Various input and output FIFO lengths
For more detailed information on the VCP2, see the TMS320C645x DSP Viterbi-Decoder Coprocessor 2
(VCP2) Reference Guide (literature number SPRU972).
7.16.2 VCP2 Peripheral Register Descriptions
Table 7-96. VCP2 Registers
EDMA BUS CONFIGURATION BUS
ACRONYM REGISTER NAME
HEX ADDRESS RANGE HEX ADDRESS RANGE
5800 0000 - VCPIC0 VCP2 Input Configuration Register 0
5800 0004 - VCPIC1 VCP2 Input Configuration Register 1
5800 0008 - VCPIC2 VCP2 Input Configuration Register 2
5800 000C - VCPIC3 VCP2 Input Configuration Register 3
5800 0010 - VCPIC4 VCP2 Input Configuration Register 4
5800 0014 - VCPIC5 VCP2 Input Configuration Register 5
5800 0018 - 5800 0044 - Reserved
5800 0048 - VCPOUT0 VCP2 Output Register 0
5800 004C - VCPOUT1 VCP2 Output Register 1
5800 0050 - 5800 007C - Reserved
5800 0080 N/A VCPWBM VCP2 Branch Metrics Write FIFO Register
5800 0084 - 5800 009C - Reserved
5800 00C0 N/A VCPRDECS VCP2 Decisions Read FIFO Register
N/A 02B8 0018 VCPEXE VCP2 Execution Register
N/A 02B8 0020 VCPEND VCP2 Endian Mode Register
N/A 02B8 0040 VCPSTAT0 VCP2 Status Register 0
N/A 02B8 0044 VCPSTAT1 VCP2 Status Register 1
N/A 02B8 0050 VCPERR VCP2 Error Register
- Reserved
N/A 02B8 0060 VCPEMU VCP2 Emulation Control Register
N/A 02B8 0064 - 02B9 FFFF - Reserved
Copyright © 2005–2012, Texas Instruments Incorporated C64x+ Peripheral Information and Electrical Specifications 219
Submit Documentation Feedback
Product Folder Link(s): TMS320C6455
To Next Page
Loading...
Need help?
General
