Marine Radio - Marine Radio Decoder User Manual

7.1.1 Hard Decision Data
www.ti.com Endianness
Figure 71. EN = 0 (Big-Endian Mode) Rate = 3/4
Word Word
N N + 1
SP4 SP3 SP2 SP1 SP0 SP9 SP8 SP7 SP6 SP5
0 0 0 A0 X0 0 0 0 0 X1
Word Word
N + 2 N + 3
SP4 SP3 SP2 SP1 SP0 SP9 SP8 SP7 SP6 SP5
0 0 0 0 X2 0 A3' 0 0 X3
Word Word
N + 4 N + 5
SP4 SP3 SP2 SP1 SP0 SP9 SP8 SP7 SP6 SP5
0 0 0 0 X4 0 0 0 0 X5
1. OUT_ORDER = 0 EN = 1 (Little-Endian Mode)
OUT_ORDER = 0 results in ordering the hard decision data from 0 to 31 in the 32-bit word output.
Figure 72. Source of Endianness Manager - Ordering of Hard Decisions in 32-Bit Word
(OUT_ORDER = 0)
63 62 32 31 1 0
Stage Stage Stage Stage Stage Stage
N N - 1 N - 31 N - 32 N - 62 N - 63
Figure 73. Destination of Endianness Manager - Ordering of Hard Decisions in 32-Bit Word
(OUT_ORDER = 0)
63 62 32 31 1 0
Stage Stage Stage Stage Stage Stage
N N - 1 N - 31 N - 32 N - 62 N - 63
2. OUT_ORDER = 1 EN = 1 (Little-Endian Mode)
OUT_ORDER = 1 results in ordering the hard decision data from 32 to 0 in the 32-bit word output.
Figure 74. Source of Endianness Manager - Ordering of Hard Decisions in 32-Bit Word
(OUT_ORDER = 1)
63 62 32 31 1 0
Stage Stage Stage Stage Stage Stage
N N - 1 N - 31 N - 32 N - 62 N - 63
Figure 75. Destination of Endianness Manager - Ordering of Hard Decisions in 32-Bit Word
(OUT_ORDER = 1)
63 62 32 31 1 0
Stage Stage Stage Stage Stage Stage
N - 31 N - 30 N N - 63 N - 33 N - 32
3. OUT_ORDER = 0, EN = 0 (Big-Endian Mode)
Figure 76. Source of Endianness Manager - Trellis Stage Ordering of Hard Decisions in 32-Bit Word
(OUT_ORDER = 0)
63 62 32 31 1 0
Stage Stage Stage Stage Stage Stage
N N - 1 N - 31 N - 32 N - 62 N - 63
SPRUGK1 – March 2009 TMS320C6457 Turbo-Decoder Coprocessor 2 53
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