VS and FIELD Configuration
The following controls allow the user to configure the behavior
of the VS and FIELD output pins, as well as the generation of
embedded AV codes:
• ADV encoder compatible signals via NEWAVMODE
• PVS, PF
• HVSTIM
• VSBHO, VSBHE
• VSEHO, VSEHE
• For NTSC control:
o NVBEGDELO, NVBEGDELE, NVBEGSIGN,
NVBEG[4:0]
o NVENDDELO, NVENDDELE, NVENDSIGN,
NVEND[4:0]
o NFTOGDELO, NFTOGDELE, NFTOGSIGN,
NFTOG[4:0]
• For PAL control:
o PVBEGDELO, PVBEGDELE, PVBEGSIGN,
PVBEG[4:0]
o PVENDDELO, PVENDDELE, PVENDSIGN,
PVEND[4:0]
o PFTOGDELO, PFTOGDELE, PFTOGSIGN,
PFTOG[4:0]
NEWAVMODE New AV Mode, Address 0x31, [4]
Table 101. NEWAVMODE Function
NEWAVMODE Description
0
EAV/SAV codes generated to suit ADI
encoders. No adjustments possible.
1*
Enable Manual Position of VSYNC, Field, and
AV codes using 0x34 to 0x37 and 0xE5 to 0xEA.
Default register settings are CCIR656
compliant; see Figure 20 for NTSC and
Figure 25 for PAL. For recommended manual
user settings, see Table 109 and Figure 21 for
NTSC; see Table 122 and Figure 26 for PAL.
*Default value.
ADV7181
HVSTIM Horizontal VS Timing (SDP), Address 0x31, [3]
The HVSTIM bit allows the user to select where the VS signal is
asserted within a line of video. Some interface circuitry may
require VS to go low while HS is low.
Table 102. HVSTIM Function
HVSTIM
Description
0*
Start of line relative to HSE.
1
Start of line relative to HSB.
*Default value.
VSBHO VS Begin Horizontal Position Odd (SDP),
Address 0x32, [7]
The VSBHO and VSBHE bits select the position within a line at
which the VS pin (not the bit in the AV code) goes active. Some
follow-on chips require the VS pin to only change state when
HS is high/low.
Table 103. VSBHO Function
VSBHO
Description
0*
VS pin goes high at the middle of a line of video
(odd field).
1
VS pin changes state at the start of a line (odd
field).
*Default value.
VSBHE VS Begin Horizontal Position Even (SDP),
Address 0x32, [6]
The VSBHO and VSBHE bits select the position within a line at
which the VS pin (not the bit in the AV code) goes active. Some
follow-on chips require the VS pin to only change state when
HS is high/low.
Table 104. VSBHE Function
VSBHE Description
0*
VS pin goes high at the middle of a line of video
(even field).
1
VS pin changes state at the start of a line (even field).
*Default value.
VSEHO VS End Horizontal Position Odd (SDP),
Address 0x33, [7]
The VSEHO and VSEHE bits select the position within a line at
which the VS pin (not the bit in the AV code) goes active. Some
follow-on chips require the VS pin to only change state when
HS is high/low.
Table 105. VSEHO Function
VSEHO Description
0*
VS pin goes low (inactive) at the middle of a line of
video (odd field).
1
VS pin changes state at the start of a line (odd field).
*Default value.
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