ADV7180
For all NTSC/PAL VSYNC timing controls, both the V bit in
the AV code and the VSYNC on the VS pin are modified.
NVBEGDELO, NTSC VSYNC Begin Delay on Odd Field,
Address 0xE5 [7]
When NVBEGDELO is 0 (default), there is no delay.
Setting NVBEGDELO to 1 delays VSYNC going high on an odd
field by a line relative to NVBEG.
1
NVENDSIGN
0
ADVANCE END OF
VSYNC BY NVEND[4:0]
DELAY END OF VSYNC
BY NVEND[4:0]
1
NVBEGSIGN
0
ADVANCE BEGIN OF
VSYNC BY NVBEG[4:0]
DELAY BEGIN OF
VSYNC BY NVBEG[4:0]
NOT VALID FOR USER
PROGRAMMING
ODD FIELD?
YES
NO
NOT VALID FOR USER
PROGRAMMING
ODD FIELD?
YES
NO
NVENDDELO
1
NVENDDELE
1
0
0
NVBEGDELO
1
NVBEGDELE
1
ADDITIONAL
DELAY BY
1 LINE
ADDITIONAL
DELAY BY
1 LINE
0
0
ADDITIONAL
DELAY BY
1 LINE
ADDITIONAL
DELAY BY
1 LINE
VSEHO
1
VSEHE
1
0
0
VSBHO
1
VSBHE
1
ADVANCE BY
0.5 LINE
ADVANCE BY
0.5 LINE
0
0
ADVANCE BY
0.5 LINE
ADVANCE BY
0.5 LINE
VSYNC END
Figure 36. NTSC Vsync End
VSYNC BEGIN
NVENDDELO, NTSC Vsync End Delay on Odd Field,
Address 0xE6 [7]
Figure 35. NTSC Vsync Begin
When NVENDDELO is 0 (default), there is no delay.
NVBEGDELE, NTSC Vsync Begin Delay on Even Field,
Address 0xE5 [6]
Setting NVENDDELO to 1 delays vsync from going low on an
odd field by a line relative to NVEND.
When NVBEGDELE is 0 (default), there is no delay.
NVENDDELE, NTSC Vsync End Delay on Even Field,
Address 0xE6 [6]
Setting NVBEGDELE to 1 delays vsync going high on an even
field by a line relative to NVBEG.
When NVENDDELE is set to 0 (default), there is no delay.
NVBEGSIGN, NTSC Vsync Begin Sign, Address 0xE5 [5]
Setting NVENDDELE to 1 delays vsync from going low on an
even field by a line relative to NVEND.
Setting NVBEGSIGN to 0 delays the start of vsync. Set for user
manual programming.
NVENDSIGN, NTSC Vsync End Sign, Address 0xE6 [5]
Setting NVBEGSIGN to 1 (default) advances the start of vsync.
Not recommended for user programming.
Setting NVENDSIGN to 0 (default) delays the end of vsync.
Set for user manual programming.
NVBEG[4:0], NTSC Vsync Begin, Address 0xE5 [4:0]
Setting NVENDSIGN to 1 advances the end of vsync. Not
recommended for user programming.
The default value of NVBEG is 00101, indicating the NTSC
vsync begin position.
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