Texas Instruments TURBO-DECODER COPROCESSOR 2 TMS320C6457 DSP Benutzerhandbuch
6.2
TCP2 Input Configuration Register 0 (TCPIC0)
Registers
www.ti.com
The TCP2 input configuration register 0 (TCPIC0) is shown in
and described in
. TCPIC0
configures the TCP.
Figure 33. TCP2 Input Configuration Register 0 (TCPIC0)
31
30
16
Rsvd
FL
R/W-0
R/W-0
15
14
13
12
11
10
8
Reserved
NUMSW
OUTF
INTER
Reserved
RATE
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
7
3
2
1
0
Reserved
OPMOD
Reserved
R/W-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 6. TCP2 Input Configuration Register 0 (TCPIC0) Field Descriptions
Bit
Field
Value
Description
31
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
30-16
FL
40-
Frame length. Frame size (should not include tail symbols).
20730
15
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
14
NUMSW
Number of slide window per sub-block
0
Block size 3 128
1
Block size >128
13
OUTF
Output parameters read flag (SA mode only, must be set to 0 for SP mode).
0
No REVT generation. Output parameters are not read via EDMA3.
1
REVT generation for output parameters for EDMA3 read.
12
INTER
Interleaver write flag. Only used in standalone mode.
0
Interleaver table is not sent to the TCP2
1
Interleaver table is sent to the TCP2
11
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
10-8
RATE
Code rate = 1/rate except for 0 = 3/4
7-3
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
2-1
OPMOD
0-3h
Operational mode. This two bit signal defines the processing mode for the TCP2. If the size of the
frame is less than or equal to 20,730, then the TCP2 is in the more efficient standalone mode. If the
size of the frame is greater than 20,730, then the TCP2 is in shared mode.
frame is less than or equal to 20,730, then the TCP2 is in the more efficient standalone mode. If the
size of the frame is greater than 20,730, then the TCP2 is in shared mode.
00
Standalone mode
01
Shared-processing mode first subframe
10
Shared-processing mode middle subframe
11
Shared-processing mode last
Shared mode breaks the frame into smaller frames called subframes. The size of each subframe
(except the last subframe) must be an integer multiple of 256. For subframe equations, see
(except the last subframe) must be an integer multiple of 256. For subframe equations, see
0
Reserved
0
Reserved. The reserved bit location is always read as 0. A value written to this field has no effect.
In the above register, when the OPMOD field is 01b, it represents the first subframe, 10b represents
middle subframes, and 11b represents the last subframe. The TCP2 needs to know which type of
subframe it is processing so that it can correctly initialize the prolog sections.
middle subframes, and 11b represents the last subframe. The TCP2 needs to know which type of
subframe it is processing so that it can correctly initialize the prolog sections.
TMS320C6457 Turbo-Decoder Coprocessor 2
28
SPRUGK1 – March 2009