Texas Instruments TMS320C6457 DSP 10 Output Parameters 11 Events Generation

10 Output Parameters
11 Events Generation
Write to
TCPEND
Write to
TCPEXE
Soft
reset
XEVT
Write
input
params
XEVT XEVT
Write
input
data coefficients
interleaver
Write
MAP0
decode MAP decode REVT REVT XEVT
decisions
hard
Read
registers
Read
output
T
CPU/DMA
operations
TCP
operations
Output Parameters www.ti.com
•The EMAXSTR bit can be enabled or disabled in TCPIC3, 0 = max star disabled (enable MaxLog-MAP, 1 = max star enabled (enable log MAP)).
•The minimum number of iterations (MINIT bits in TCPIC3) should be selected as a function of theoverall 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 Section 6.7through Section 6.12 , respectively.
Table 45. Input Configuration Parameters Settings in Shared-Processing (SP)Mode
Bit field Register Value
OPMOD TCPIC0 OPMOD = 2 for first subframeOPMOD = 4 for middle subframeOPMOD = 6 for last subframe
INTER TCPIC0 INTER = 0
OUTF TCPIC0 OUTF = 0
The various output parameters are described in Section 6.19 through Section 6.21 . These parametersprovide useful information when the stopping criteria are enabled.
A TCP2 transmit event (TCPXEVT) and TCP2 receive event (TCPREVT) are generated as shown inFigure 100 for standalone (SA) mode and as shown in Figure 101 for shared-processing (SP) mode(example of 2 subframes).
Figure 100. TCP2 Events Generation in Standalone (SA) Mode
TMS320C6457 Turbo-Decoder Coprocessor 274 SPRUGK1 – March 2009Submit Documentation Feedback