Texas Instruments TMS320C6457 DSP manual TCP2 Input Configuration Register 5 TCPIC5, Tail Symbols

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6.7TCP2 Input Configuration Register 5 (TCPIC5)

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	X6+X2+X+1
8	000000CD	X8+X7+X4+X3+X+1
10	000003EC	X10+X9+X8+X7+X6+X4+X3+1
12	00000F89	X12+X11+X10+X9+X8+X4+X+1
16	0000E433	X16+X15+X14+X11+X6+X5+X2+X+1
24	00800043	X24+X7+X2+X+1
32	80000043	X32+X7+X2+X+1

6.8Tail Symbols

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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