Texas Instruments TMS320DM648 manual Video Display Event Register Vddispevt, DISPEVT2, DISPEVT1

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Video Display Registers

4.12.22 Video Display Event Register (VDDISPEVT)

The video display event register (VDDISPEVT) is programmed with the number of EDMA events to be generated for display field 1 and field 2.

The video display event register (VDDISPEVET) is shown in Figure 4-52and described in Table 4-27.

Figure 4-52. Video Display Event Register (VDDISPEVT)

31	28	27	16
	Reserved		DISPEVT2
	R-0		R/W-0
15	12	11	0
	Reserved		DISPEVT1
	R-0		R/W-0

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

Table 4-27. Video Display Event Register (VDDISPEVT) Field Descriptions

					Description
Bit	field (1)	symval (1)	Value	BT.656 and Y/C Mode	Raw Data Mode
31-28	Reserved	-	0	Reserved. The reserved bit location is always read as 0. A value written to this field
				has no effect.

27-16 DISPEVT2	OF(value)	0-FFFh Specifies the number of EDMA event
		sets (YEVT, CbEVT, CrEVT) to be
		generated for field 2 output.
	DEFAULT	0

Specifies the number of EDMA events (YEVT) to be generated for field 2 output.

15-12 Reserved	-	0	Reserved. The reserved bit location is always read as 0. A value written to this field
			has no effect.

11-0 DISPEVT1	OF(value)	0-FFFh Specifies the number of EDMA event
		sets (YEVT, CbEVT, CrEVT) to be
		generated for field 1 output.
	DEFAULT	0

Specifies the number of EDMA events (YEVT) to be generated for field 1 output.

(1)For CSL implementation, use the notation VP_VDDISPEVT_DISPEVTn_symval

4.12.23 Video Display Clipping Register (VDCLIP)

The video display module in the BT.656 and Y/C modes performs programmable clipping. The clipping is performed as the last step of the video pipeline. It is applied only on the image areas defined by VDIMGSZn and VDIMGOFFn inside the active video area (blanking values are not clipped).

VDCLIP allows output values to be clamped within the specified values. The default values are the BT.601-specified peak black level of 16 and peak white level of 235 for luma and the maximum quantization levels of 16 and 240 for chroma. For 10-bit operation, the clipping is applied to the 8 MSBs of the value with the 2 LSBs cleared. (For example, a Y value of FF.8h is clipped to EB.0h and a Y value of 0F.4h is clipped to 10.0h.)

The video display clipping register (VDCLIP) is shown in Figure 4-53and described in Table 4-28.

142 Video Display Port SPRUEM1 –May 2007

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