Texas Instruments TMS320C6457 DSP TCP2 Input Configuration Register 1 TCPIC1, Snr, Maxit, Nsb

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6.3TCP2 Input Configuration Register 1 (TCPIC1)

The TCP2 input configuration register 1 (TCPIC1) is shown in Figure 34 and described in Table 7. 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.

6.4TCP2 Input Configuration Register 2 (TCPIC2)

The TCP2 input configuration register 2 (TCPIC2) is shown in Figure 35 and described in Table 8. 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.
		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.

SPRUGK1–March 2009	TMS320C6457 Turbo-Decoder Coprocessor 2	29
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