www.ti.com
718
FPCOUNT
HBLNK
HSYNC
719 720
735 736
799 800
857
0
1
FPCOUNT = HBLNKSTART
FPCOUNT = HBLNKSTOP
FPCOUNT = HSYNCSTOP
FPCOUNT = HSYNCSTART
FLCOUNT
VBLNK
VSYNC
FLCOUNT = VSYNCYSTOP1
FPCOUNT = VSYNCXSTOP1
263
264
265
18
19
20
5
6
7
266
282
283
284
524
525
1
2
3
4
5
267
268
269
270
FLD
FLCOUNT = VBLNKYSTOP1
FPCOUNT = VBLNKXSTOP1
FLCOUNT = VBLNKYSTART2
FPCOUNT = VBLNKXSTART2
FLCOUNT = VBLNKYSTOP2
FPCOUNT = VBLNKXSTOP2
FLCOUNT = VBLNKYSTART1
FPCOUNT = VBLNKXSTART1
FLCOUNT = VSYNCYSTART2
FPCOUNT = VSYNCXSTART2
FLCOUNT = VSYNCYSTART1
FPCOUNT = VSYNCXSTART1
FLCOUNT = VSYNCYSTOP2
FPCOUNT = VSYNCXSTOP2
FLCOUNT = FLD2YSTART
FPCOUNT = FLD2XSTART
FLCOUNT = FLD1YSTART
FPCOUNT = FLD1XSTART
One Frame
One Line
Field 2
Field 1
Video Display Mode Selection
shows how the horizontal blanking and horizontal synchronization signals are triggered.
(HBLNK and HSYNC are shown active high).
Figure 4-5. Horizontal Blanking and Horizontal Sync Timing
The 12-bit FLCOUNT counts which scan line is being generated. The FLCOUNT is reset to 1 after
reaching the count specified in VDFRMSZ. (For BT.656 operation, the FRMHIGHT would be set to 525
(525/60 operation) or 625 (625/50 operation).) The state of FLCOUNT is reflected in the VDYPOS bits of
VDSTAT.
shows how the vertical blanking, vertical synchronization, and field identification
signals are triggered. (VBLNK and VSYNC are shown active high.)
Note that the signals can transition at any place along the video line (specified by the XSTART and
XSTOP bits of the appropriate registers). In this case, VBLNK starts at horizontal count VBLNKXSTART2
= 429 on scan line VBLNKYSTART2 = 263 (565/60 operation).
Figure 4-6. Vertical Blanking, Sync and Even/Odd Frame Signal Timing
SPRUEM1 – May 2007
Video Display Port
97