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Example 2: Noncontinuous Frame Display for 525/60 Format
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
#define VD_FRM_HEIGHT
#define VD_FRM_SIZE
/* ––––––––––––––––––– */
/* Horizontal blanking */
/* ––––––––––––––––––– */
#define VD_HBLNK_START
#define VD_HBLNK_STOP
#define VD_HBLNK_SIZE
/* –––––––––––––––––––––––––––– */
/* Vertical blanking for field1 */
/* –––––––––––––––––––––––––––– */
#define VD_VBLNK_XSTART1
#define VD_VBLNK_YSTART1
#define VD_VBLNK_XSTOP1
#define VD_VBLNK_YSTOP1
/* –––––––––––––––––––––––––––– */
/* Vertical blanking for field2 */
/* –––––––––––––––––––––––––––– */
#define VD_VBLNK_XSTART1
#define VD_VBLNK_YSTART1
#define VD_VBLNK_XSTOP1
#define VD_VBLNK_YSTOP1
A-10
Video Port Configuration Examples
858 /* no of pixels per frame line
/* including horizontal blanking
525 /* total noof lines per frame
(VD_FRM_WIDTH * VD_FRM_HEIGHT)
720 /* starting location of EAV
856 /* starting location of SAV
(VD_HBLNK_STOP – VD_HBLNK_START +
2/*EAV*/) /* (138) EAV, SAV inclusive */
720 /* pixel on which VBLNK active
/* edge occurs for field1
1
/* line on which VBLNK active
/* edge occurs for field1
720 /* pixel on which VBLNK inactive
/* edge occurs for field1
20
/* line on which VBLNK inactive
/* edge occurs for field1
360 /* pixel on which VBLNK active
/* edge occurs for field2
263 /* line on which VBLNK active
/* edge occurs for field2
360 /* pixel on which VBLNK inactive
/* edge occurs for field2
283 /* line on which VBLNK inactive
/* edge occurs for field2
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
*/
SPRU629
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