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Example 2: Noncontinuous Frame Display for 525/60 Format
Video Port Configuration ExamplesA-10 SPRU629
A.2 Example 2: Noncontinuous Frame Display for 525/60 Format
This is an example that explains how to configure the video port for 8-bit
BT.656 noncontinuous frame display for 525/60 format. See ITU–R BT.656–4
and video port specification (Figures 4–11, 4–33, 4–34, and Table 4–37) for
more details on 525/60 format. For simplicity, this example does not contain
any margins; that is, both vertical and horizontal offsets are zero. In other
words, both active area and image area are the same.
/**********************************************************/
/* Display parameter definitions based on 525/60 format */
/**********************************************************/
/* ––––––––––––––––– */
/* Define frame size */
/* ––––––––––––––––– */
#define VD_FRM_WIDTH 858 /* no of pixels per frame line */
/* including horizontal blanking */
#define VD_FRM_HEIGHT 525 /* total noof lines per frame */
#define VD_FRM_SIZE (VD_FRM_WIDTH * VD_FRM_HEIGHT)
/* ––––––––––––––––––– */
/* Horizontal blanking */
/* ––––––––––––––––––– */
#define VD_HBLNK_START 720 /* starting location of EAV */
#define VD_HBLNK_STOP 856 /* starting location of SAV */
#define VD_HBLNK_SIZE (VD_HBLNK_STOP – VD_HBLNK_START +
2/*EAV*/) /* (138) EAV, SAV inclusive */
/* –––––––––––––––––––––––––––– */
/* Vertical blanking for field1 */
/* –––––––––––––––––––––––––––– */
#define VD_VBLNK_XSTART1 720 /* pixel on which VBLNK active */
/* edge occurs for field1 */
#define VD_VBLNK_YSTART1 1 /* line on which VBLNK active */
/* edge occurs for field1 */
#define VD_VBLNK_XSTOP1 720 /* pixel on which VBLNK inactive */
/* edge occurs for field1 */
#define VD_VBLNK_YSTOP1 20 /* line on which VBLNK inactive */
/* edge occurs for field1 */
/* –––––––––––––––––––––––––––– */
/* Vertical blanking for field2 */
/* –––––––––––––––––––––––––––– */
#define VD_VBLNK_XSTART1 360 /* pixel on which VBLNK active */
/* edge occurs for field2 */
#define VD_VBLNK_YSTART1 263 /* line on which VBLNK active */
/* edge occurs for field2 */
#define VD_VBLNK_XSTOP1 360 /* pixel on which VBLNK inactive */
/* edge occurs for field2 */
#define VD_VBLNK_YSTOP1 283 /* line on which VBLNK inactive */
/* edge occurs for field2 */