User's Manual

6.7 TCP2 Input Configuration Register 5 (TCPIC5)
6.8 Tail Symbols
Registers www.ti.com
The TCP2 input configuration register 5 (TCPIC5) is shown in Figure 38 and described in Table 11 .
TCPIC5 provides the 32-bit CRC Polynomial to TCP2.
Figure 38. TCP2 Input Configuration Register 5 (TCPIC5)
31 0
CRCPOLY
R/W-0
LEGEND: R/W = Read/Write; R = Read only; - n = value after reset
Table 11. TCP2 Input Configuration Register 5 (TCPIC5) Field Descriptions
Bit Field Value Description
31-0 CRCPOLY 0 CRC polynomial. This 32 bit parameter defines the CRC polynomial. Table 12 lists some examples
for CRCPOLY.
Table 12. CRC Examples
CRC Length CRC Poly Polynomial
6 00000023 X
6
+X
2
+X+1
8 000000CD X
8
+X
7
+X
4
+X
3
+X+1
10 000003EC X
10
+X
9
+X
8
+X
7
+X
6
+X
4
+X
3
+1
12 00000F89 X
12
+X
11
+X
10
+X
9
+X
8
+X
4
+X+1
16 0000E433 X
16
+X
15
+X
14
+X
11
+X
6
+X
5
+X
2
+X+1
24 00800043 X
24
+X
7
+X
2
+X+1
32 80000043 X
32
+X
7
+X
2
+X+1
The tail symbols are symbols appended to the end of the information symbols to force both the
non-interleaved encoder to the 0 state and the interleaved encoder to the 0 state. The raw input data
streams for the 6-bit tail symbols are shown in the TCP2 input registers TCPIC6 -11.
It also shows how to load the six 18-bit tail registers in standalone mode. These registers are loaded from
the EDMA3 bus. In shared mode, input registers TCPIC9 - 11 are not used. Regardless of the mode,
these 6 input parameters have to be loaded by the EDMA3 prior to any decoding.
32 TMS320C6457 Turbo-Decoder Coprocessor 2 SPRUGK1 – March 2009
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