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Display Timing Examples
The vertical output timing is shown in
720-lines high. This example shows the 716-line image window with an IMGVOFFn of 3 lines and also
results in a non-data line at the end of the field.
The VBLNK and VSYNC signals are shown as they would be output for active-low operation. Note that
only one of the two signals is actually available externally. The VBLNK and VSYNC edges occur at the
end of an active line so their XSTART/XSTOP values are set to 1280 (start of blanking). The field 2
vertical timing start and stop registers are programmed to a value greater than 750. Since this value is
never reached by FLCOUNT, no extra VBLNK or VSYNC transitions occur. For true SMPTE 296M
operation, neither VBLNK nor VSYNC would be used.
The FLD output is setup to transition low at the start of each frame. Since the FLD2YSTART value is
never reached by FLCOUNT, the FLD output remains always low.
The ILCOUNT operation follows the description in
displayed line (FLCOUNT = VBLNKSTOPx + IMGVOFFn) and stops counting at the last displayed pixel
(IPCOUNT = IMGVSIZEx). The operation during non-display time is not a requirement, it could continue
counting until the next FLCOUNT = VBLNKSTOPx + IMGVOFFn point or it could reset immediately after
IMGVSIZEx or when FLCOUNT is reset.
The active horizontal output column shows the output data during the active portion of the horizontal line.
It is assumed that the DVEN bit in VDCTL is set to enable the default output.
Figure 4-30. Y/C Progressive Display Vertical Timing Example
FLCOUNT
A
Assumes VCT1P bit in VPCTL is set to 1 (active-low output). VSYNC output when VCTL2S bit in VDCTL is set to 00,
VBLNK output when VCTL2S bit is set 01.
B
If DVEN bit in VDCTL is set to 1; otherwise, blanking value is output
118
Video Display Port
Figure
ILCOUNT
750
716
1
2
3
4
5
Field 1 Blanking
6
Ç Ç Ç Ç Ç Ç
Ç Ç Ç Ç Ç Ç
É É É É É É
25
26
Ç Ç Ç Ç Ç Ç
É É É É É É
Field 1 Active
27
28
É É É É É É
Ç Ç Ç Ç Ç Ç
29
Ç Ç Ç Ç Ç Ç
É É É É É É
Field 1 Image
Ç Ç Ç Ç Ç Ç
É É É É É É
744
Ç Ç Ç Ç Ç Ç
É É É É É É
745
746
747
748
749
Field 1 Blanking
750
1
4-30. SMPTE 296M has a single active field 1 that is
Section
4.1.2. ILCOUNT resets to 1 at the first
EAV
V F
1
0
716
1
0
716
1
0
716
1
0
716
1
0
716
1
0
716
1
0
716
1
0
716
0
0
716
0
0
716
0
0
1
0
0
2
0
0
715
0
0
716
0
0
716
0
0
716
1
0
716
1
0
716
1
0
716
1
0
716
1
0
716
1
0
716
1
0
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Active
Horizontal
Output
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
(B)
Default Value
(B)
Default Value
(B)
Default Value
FIFO Data
FIFO Data
FIFO Data
FIFO Data
(B)
Default Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
Blanking Value
SPRUEM1 – May 2007
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