Texas Instruments TURBO-DECODER COPROCESSOR 2 TMS320C6457 DSP Benutzerhandbuch
6.3
TCP2 Input Configuration Register 1 (TCPIC1)
6.4
TCP2 Input Configuration Register 2 (TCPIC2)
www.ti.com
Registers
The TCP2 input configuration register 1 (TCPIC1) is shown in
and described in
. TCPIC1
configures the TCP.
Figure 34. TCP2 Input Configuration Register 1 (TCPIC1)
31
23 22
16 15
0
Reserved
R
Reserved
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 7. TCP2 Input Configuration Register 1 (TCPIC1) Field Desccriptions
Bit
Field
Value
Description
31-23
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
22-16
R
39-127
Reliability length + 1: 7 bits (min = 39, max = 127).
14-0
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
The TCP2 input configuration register 2 (TCPIC2) is shown in
and described in
. TCPIC2
configures the TCP.
Figure 35. TCP2 Input Configuration Register 2 (TCPIC2)
31
24
23
21
20
16
SNR
Reserved
MAXIT
R/W-0
R/W-0
R/W-0
15
14
8
7
6
5
0
Rsvd
NSB
Reserved
P
R/W-0
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 8. TCP2 Input Configuration Register 2 (TCPIC2) Field Descriptions
Bit
Field
Value
Description
31-24
SNR
0-100
SNR threshold. SNR is used for stopping test (8 bits). The turbo decoding will stop as soon as the
decoded signal SNR ratio > SNR threshold ratio. The maximum value is 100, giving a value of zero
disables this test and the decoder will execute the number of iterations given in the above
parameter.
decoded signal SNR ratio > SNR threshold ratio. The maximum value is 100, giving a value of zero
disables this test and the decoder will execute the number of iterations given in the above
parameter.
0
Disables ratio threshold
1 to 100 Enables threshold ratio
23-21
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
20-16
MAXIT
0-31
Maximum number of iterations: 5 bits (0-31). 0 means 32 iterations.
0
Sets MAXIT to 32.
15
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
14-8
NSB
0-81
Number of sub-blocks. For shared processing mode only.
7-6
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
5-0
P
4-48
Prolog length (from 4 to 48). Sliding window prolog length, maximum is 48, minimum is 4. In
shared-processing mode, the prolog length must be a multiple of 8, due to EDMA3 transfers
alignment.
shared-processing mode, the prolog length must be a multiple of 8, due to EDMA3 transfers
alignment.
SPRUGK1 – March 2009
TMS320C6457 Turbo-Decoder Coprocessor 2
29