
ADV7183B
Rev. B | Page 40 of 100
VS and FIELD Configuration
The following controls allow the user to configure the behavior
of the VS and FIELD output pins and to generate embedded AV
codes:
ADV encoder-compatible signals via NEWAVMODE
PVS, PF
HVSTIM
VSBHO, VSBHE
VSEHO, VSEHE
For NTSC control:
NVBEGDELO, NVBEGDELE, NVBEGSIGN,
NVBEG[4:0]
NVENDDELO, NVENDDELE, NVENDSIGN,
NVEND[4:0]
NFTOGDELO, NFTOGDELE, NFTOGSIGN,
NFTOG[4:0]
For PAL control:
PVBEGDELO, PVBEGDELE, PVBEGSIGN,
PVBEG[4:0]
PVENDDELO, PVENDDELE, PVENDSIGN,
PVEND[4:0]
PFTOGDELO, PFTOGDELE, PFTOGSIGN,
PFTOG[4:0]
NEWAVMODE New AV Mode, Address 0x31[4]
When NEWAVMODE is 0, EAV/SAV codes are generated to
suit ADI encoders. No adjustments are possible.
Setting NEWAVMODE to 1 (default) enables the manual posi-tion
of the Vsync, Field, and AV codes using Register 0x34 to Register
0x37 and Register 0xE5 to Register 0xEA. Default register settings
are CCIR656-compliant; see
211H
Figure 21 for NTSC and
212H
Figure 26 for
PAL. For recommended manual user settings, see
213H
Table 56 and
214H
Figure 22 for NTSC; see
215H
Table 57 and
216H
Figure 27 for PAL.
HVSTIM Horizontal VS Timing, Address 0x31[3]
The HVSTIM bit allows the user to select where the VS signal is
being asserted within a line of video. Some interface circuitry
can require VS to go low while HS is low.
When HVSTIM is 0 (default), the start of the line is relative
to HSE.
When HVSTIM is 1, the start of the line is relative to HSB.
VSBHO VS Begin Horizontal Position Odd,
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) becomes active.
Some follow-on chips require the VS pin to change state only
when HS is high/low.
When VSBHO is 0 (default), the VS pin goes high at the middle
of a line of video (odd field).
When VSBHO is 1, the VS pin changes state at the start of a line
(odd field).
VSBHE VS Begin Horizontal Position Even,
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) becomes active.
Some follow-on chips require the VS pin to change state when
only HS is high/low.
When VSBHE is 0, the VS pin goes high at the middle of a line
of video (even field).
When VSBHE is 1 (default), the VS pin changes state at the start
of a line (even field).
VSEHO VS End Horizontal Position Odd,
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) becomes active.
Some follow-on chips require the VS pin to change state only
when HS is high/low.
When VSEHO is 0 (default), the VS pin goes low (inactive) at
the middle of a line of video (odd field).
When VSEHO is 1, the VS pin changes state at the start of a line
(odd field).
VSEHE VS End Horizontal Position Even,
Address 0x33[6]
The VSEHO and VSEHE bits select the position within a line at
which the VS pin (not the bit in the AV code) becomes active.
Some follow-on chips require the VS pin to change state only
when HS is high/low.
When VSEHE is 0 (default), the VS pin goes low (inactive) at
the middle of a line of video (even field).
When VSEHE is 1, the VS pin changes state at the start of a line
(even field).
PVS Polarity VS, Address 0x37[5]
The polarity of the VS pin can be inverted using the PVS bit.
When PVS is 0 (default), VS is active high.