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Output Parameters
The EMAXSTR bit can be enabled or disabled in TCPIC3, 0 = max star disabled (enable Max
Log-MAP, 1 = max star enabled (enable log MAP)).
The minimum number of iterations (MINIT bits in TCPIC3) should be selected as a function of the
overall system performance (minimum iterations 1 to 31).
The INPUTSIGN bit can be enabled or disabled in TCPIC3 (0 = Use channel input data as is, 1 =
multiply channel input data by -1).
The OUTORDER bit can be enabled or disabled in TCPIC3 (0 = output bit ordering from 0 to 31, 1 =
output bit ordering from 31 to 0).
The TAIL1, TAIL2, TAIL3, TAIL4, TAIL5, TAIL6 bits should be programmed as described in
through
Section
6.12, respectively.
Table 45. Input Configuration Parameters Settings in Shared-Processing (SP)
Bit field
OPMOD
INTER
OUTF
10
Output Parameters
The various output parameters are described in
provide useful information when the stopping criteria are enabled.
11
Events Generation
A TCP2 transmit event (TCPXEVT) and TCP2 receive event (TCPREVT) are generated as shown in
Figure 100
for standalone (SA) mode and as shown in
(example of 2 subframes).
Figure 100. TCP2 Events Generation in Standalone (SA) Mode
Write to
TCPEND
CPU/DMA
operations
TCP
operations
74
TMS320C6457 Turbo-Decoder Coprocessor 2
Register
TCPIC0
TCPIC0
TCPIC0
Write
Write
Write to
input
input
TCPEXE
params
data
XEVT
XEVT
XEVT
Soft
reset
Mode
Value
OPMOD = 2 for first subframe
OPMOD = 4 for middle subframe
OPMOD = 6 for last subframe
INTER = 0
OUTF = 0
Section 6.19
through
Section
Figure 101
for shared-processing (SP) mode
Write
Read
interleaver
coefficients
decisions
MAP0
MAP
REVT
decode
decode
www.ti.com
Section 6.7
6.21. These parameters
Read
hard
output
registers
T
REVT
XEVT
SPRUGK1 – March 2009
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