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Figure 4-5
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
718
FPCOUNT
HBLNK
HSYNC
FPCOUNT = HBLNKSTART
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.
Figure 4-6
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
FLCOUNT
VBLNK
FLCOUNT = VBLNKYSTOP1
FPCOUNT = VBLNKXSTOP1
VSYNC
FLCOUNT = VSYNCYSTOP1
FPCOUNT = VSYNCXSTOP1
FLD
SPRUEM1 – May 2007
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719 720
735 736
FPCOUNT = HSYNCSTART
shows how the vertical blanking, vertical synchronization, and field identification
One Line
FLCOUNT = VBLNKYSTART2
FPCOUNT = VBLNKXSTART2
FLCOUNT = VSYNCYSTART2
FPCOUNT = VSYNCXSTART2
Field 1
FLCOUNT = FLD2YSTART
FPCOUNT = FLD2XSTART
799 800
FPCOUNT = HSYNCSTOP
One Frame
FLCOUNT = VBLNKYSTOP2
FPCOUNT = VBLNKXSTOP2
FLCOUNT = VSYNCYSTOP2
FPCOUNT = VSYNCXSTOP2
Field 2
Video Display Mode Selection
857
0
1
FPCOUNT = HBLNKSTOP
FLCOUNT = VBLNKYSTART1
FPCOUNT = VBLNKXSTART1
FLCOUNT = VSYNCYSTART1
FPCOUNT = VSYNCXSTART1
FLCOUNT = FLD1YSTART
FPCOUNT = FLD1XSTART
Video Display Port
97
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