ADV7181 AD [Analog Devices], ADV7181 Datasheet - Page 41

• Manufacturer Part Number: ADV7181
• Description: Multiformat SDTV Video Decoder
• Manufacturer: AD [Analog Devices]

Table 54. Recommended User Settings for NTSC
(See Figure 21)
Register
0x31
0x32
0x33
0x37
0xE5
0xE6
0xE7
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.
NVBEGDELE NTSC Vsync Begin Delay on Even Field,
Address 0xE5 [6]
When NVBEGDELE is 0 (default), there is no delay.
Setting NVBEGDELE to 1 delays VSync going high on an even
field by a line relative to NVBEG.
NOT VALID FOR USER
PROGRAMMING
VSYNC BY NVBEG[4:0]
ADVANCE BEGIN OF
ADVANCE BY
NVBEGDELO
ADDITIONAL
DELAY BY
0.5 LINE
VSBHO
1 LINE
YES
Figure 22. NTSC VSync Begin
1
1
Register Name
VSync Field Control 1
VSync Field Control 2
VSync Field Control 3
Polarity
NTSV_V_Bit_Beg
NTSC_V_Bit_End
NTSC_F_Bit_Tog
1
VSYNC BEGIN
0
0
NVBEGSIGN
ODD FIELD?
0
0
VSYNC BY NVBEG[4:0]
DELAY BEGIN OF
ADVANCE BY
NVBEGDELE
ADDITIONAL
DELAY BY
0
0.5 LINE
VSBHE
1 LINE
NO
Write
0x12
0x81
0x84
0x29
0x0
0x3
0x85
1
1
Rev. 0 | Page 41 of 96
NVBEGSIGN NTSC VSync Begin Sign, Address 0xE5 [5]
Setting NVBEGSIGN to 0 delays the start of VSync. Set for user
manual programming.
Setting NVBEGSIGN to 1 (default) advances the start of VSync.
Not recommended for user programming.
NVBEG[4:0] NTSC VSync Begin, Address 0xE5 [4:0]
The default value of NVBEG is 00101, indicating the NTSC
VSync begin position.
For all NTSC/PAL VSync timing controls, both the V bit in the
AV code and the VSync on the VS pin are modified.
NVENDDELO NTSC VSync End Delay on Odd Field,
Address 0xE6 [7]
When NVENDDELO is 0 (default), there is no delay.
Setting NVENDDELO to 1 delays VSync from going low on an
odd field by a line relative to NVEND.
NOT VALID FOR USER
PROGRAMMING
VSYNC BY NVEND[4:0]
ADVANCE END OF
ADVANCE BY
NVENDDELO
ADDITIONAL
DELAY BY
0.5 LINE
VSEHO
1 LINE
YES
1
1
Figure 23. NTSC VSync End
1
0
0
NVENDSIGN
ODD FIELD?
VSYNC END
0
0
DELAY END OF VSYNC
BY NVEND[4:0]
ADVANCE BY
NVENDDELE
ADDITIONAL
DELAY BY
0
0.5 LINE
VSEHE
1 LINE
ADV7181B
NO
1
1