Video Port/VCXO Interpolated Control (VIC) Port User's Guide

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4.12.22 Video Display Event Register (VDDISPEVT)
4.12.23 Video Display Clipping Register (VDCLIP)
Video Display Registers
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 4-52 and 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 Specifies the number of EDMA events
sets (YEVT, CbEVT, CrEVT) to be (YEVT) to be generated for field 2
generated for field 2 output. output.
DEFAULT 0
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 Specifies the number of EDMA events
sets (YEVT, CbEVT, CrEVT) to be (YEVT) to be generated for field 1
generated for field 1 output. output.
DEFAULT 0
(1)
For CSL implementation, use the notation VP_VDDISPEVT_DISPEVT n_ symval
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
VDIMGSZ n and VDIMGOFF n 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 4-53 and described in Table 4-28 .
Video Display Port142 SPRUEM1 – May 2007
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