TMS320TCI6487
TMS320TCI6488
Communications Infrastructure Digital Signal Processor
SPRS358F–APRIL 2007–REVISED AUGUST 2008
www.ti.com
8.16 Enhanced Turbo Decoder Coprocessor (TCP2)
8.16.1 TCP2 Device-Specific Information
The TCI6487/8 device has a high-performance embedded coprocessor Turbo-Decoder Coprocessor
(TCP2) that significantly speeds up channel-decoding operations on-chip. The TCP2 operating at CPU
clock divided-by-3 can decode up to fifty 384-Kbps or eight 2-Mbps turbo-encoded channels (assuming 6
iterations). The TCP2 implements the max* log-map algorithm and is designed to support all polynomials
and rates required by Third-Generation Partnership Projects (3GPP and 3GPP2), with fully programmable
frame length and turbo interleaver. Decoding parameters such as the number of iterations and stopping
criteria are also programmable. Communications between the TCP2 and the CPU are carried out through
the EDMA3 controller.
The TCP2 supports:
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•
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Parallel concatenated convolutional turbo decoding using the MAP algorithm
All turbo code rates greater than or equal to 1/5
3GPP and CDMA2000 turbo encoder trellis
3GPP and CDMA2000 block sizes in standalone mode
Larger block sizes in shared processing mode
Both max log MAP and log MAP decoding
Sliding windows algorithm with variable reliability and prolog lengths
The prolog reduction algorithm
Execution of a minimum and maximum number of iterations
The SNR stopping criteria algorithm
The CRC stopping criteria algorithm
For more detailed information on the TCP2, see the TMS320TCI648x DSP Turbo-Decoder Coprocessor 2
(TCP2) Reference Guide (literature number SPRUE10).
8.16.2 TCP2 Peripheral Register Description(s)
Table 8-67. TCP2 Registers
EDMA BUS HEX ADDRESS RANGE
CONFIGURATION BUS HEX
ADDRESS RANGE
ACRONYM
REGISTER NAME
5000 0000
5000 0004
5000 0008
5000 000C
5000 0010
5000 0014
5000 0018
5000 001C
5000 0020
5000 0024
5000 0028
5000 002C
5000 0030
5000 0034
5000 0038
5000 003C
5000 0040
5000 0044
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
TCPIC0
TCPIC1
TCPIC2
TCPIC3
TCPIC4
TCPIC5
TCPIC6
TCPIC7
TCPIC8
TCPIC9
TCPIC10
TCPIC11
TCPIC12
TCPIC13
TCPIC14
TCPIC15
TCPOUT0
TCPOUT1
TCP2 Input Configuration Register 0
TCP2 Input Configuration Register 1
TCP2 Input Configuration Register 2
TCP2 Input Configuration Register 3
TCP2 Input Configuration Register 4
TCP2 Input Configuration Register 5
TCP2 Input Configuration Register 6
TCP2 Input Configuration Register 7
TCP2 Input Configuration Register 8
TCP2 Input Configuration Register 9
TCP2 Input Configuration Register 10
TCP2 Input Configuration Register 11
TCP2 Input Configuration Register 12
TCP2 Input Configuration Register 13
TCP2 Input Configuration Register 14
TCP2 Input Configuration Register 15
TCP2 Output Parameters Register 0
TCP2 Output Parameters Register 1
162
Peripheral Information and Electrical Specifications
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