ADV7183ABST datasheet(44/104 Pages) AD

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ADV7183A

Rev. A | Page 44 of 104

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:

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]

Table 102. NEWAVMODE Function

NEWAVMODE

Description

EAV/SAV codes generated to suit ADI

encoders. No adjustments possible.

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 21 for NTSC and

Figure 26 for PAL. For recommended manual

user settings, see Table 110 and Figure 22 for

NTSC; see Table 123 and Figure 27 for PAL.

*Default value.

HVSTIM Horizontal VS Timing (SDP), 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

may require VS to go low while HS is low.

Table 103. HVSTIM Function

HVSTIM

Description

Start of line relative to HSE.

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 104. VSBHO Function

VSBHO

Description

VS pin goes high at the middle of a line of video

(odd field).

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 105. VSBHE Function

VSBHE

Description

VS pin goes high at the middle of a line of video

(even field).

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 106. VSEHO Function

VSEHO

Description

VS pin goes low (inactive) at the middle of a line of

video (odd field).

VS pin changes state at the start of a line (odd field).

*Default value.

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