Texas Instruments TMS320DM648 manual VIC Control Register Vicctl

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VIC Port Registers

6.5.1 VIC Control Register (VICCTL)

The VIC control register (VICCTL) is shown in Figure 6-3and described in Table 6-4.

Figure 6-3. VIC Control Register (VICCTL)

31				16
	Reserved
	R-0
15	4	3	1	0
Reserved		PRECISION		GO
R-0		R/W-0		R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

Table 6-4. VIC Control Register (VICCTL) Field Descriptions

Bit	field	symval (1)	Value	Description
31-4	Reserved	-	0	Reserved. The reserved bit location is always read as 0. A value written to this field
				has no effect.
3-1	PRECISION	OF(value)	0-7h	Precision bits determine the resolution of the interpolation. The PRECISION bits can
				only be written when the GO bit is cleared to 0. If the GO bit is set to 1, a write to the
				PRECISION bits does not change the bits.
		DEFAULT	0	16 bits
		16BITS
		15BITS	1h	15 bits
		14BITS	2h	14 bits
		13BITS	3h	13 bits
		12BITS	4h	12 bits
		11BITS	5h	11 bits
		10BITS	6h	10 bits
		9BITS	7h	9 bits
0	GO	OF(value)		The GO bit can be written to at any time.
		DEFAULT	0	The VICDIV and VICCTL registers can be written to without affecting the operation of
		0		the VIC port. All the logic in the VIC port is held in reset state and a 0 is output on the
				VCTL output line. A write to VICCTL bits as well as setting GO to 1 is allowed in a
				single write operation. The VICCTL bits change and the GO bit is set, disallowing any
				further changes to the VICCTL and VICDIV registers.
		1	1	The VICDIV and VICCTL (except for the GO bit) registers cannot be written. If a write
				is performed to the VICDIV or VICCTL registers when the GO bit is set, the values of
				these registers remain unchanged. If a write is performed that clears the GO bit to 0
				and changes the values of other VICCTL bits, it results in GO = 0 while keeping the
				rest of the VICCTL bits unchanged. The VIC port is in its normal working mode in this
				state.

(1)For CSL implementation, use the notation VIC_VICCTL_field_symval

SPRUEM1 –May 2007 VCXO Interpolated Control Port 171

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