AD9923ABBCZ datasheet(26/88 Pages) AD

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AD9923A

Rev. 0 | Page 26 of 88

Vertical Pattern (VPAT) Groups

A vertical pattern (VPAT) group defines the individual pulse

pattern for each XV1 to XV13 output signal. Table 14 summarizes

the registers that are available for generating each VPAT group.

The first, second, third, fourth, fifth, and sixth toggle positions

(XVTOG1, XVTOG2, XVTOG3, XVTOG4, XVTOG5,

XVTOG6) are the pixel locations where the pulse transitions. All

toggle positions are 13-bit values that can be placed anywhere in

the horizontal line.

More registers are included in the vertical sequence registers to

specify the output pulses: XV1POL to XV13POL specifies the

start polarity for each signal, VSTART specifies the start

position of the VPAT group, and VLEN designates the total

length of the VPAT group, which determines the number of

pixels between each pattern repetition, if repetitions are used.

To achieve the best possible noise performance, ensure that

VSTART + VLEN < the end of the H-blank region.

Toggle positions programmed to either Pixel 0 or Pixel 8191 are

ignored. The toggle positions of unused XV-channels must be

programmed to either Pixel 0 or Pixel 8191. This prevents unpre-

dictable behavior because the default values of the V-pattern

group registers are unknown.

Table 14. Vertical Pattern Group Registers

Length (Bits)

Range

Description

XVTOG1

0 to 8191 pixel location

First toggle position within line for each XV1 to XV12 output

XVTOG2

0 to 8191 pixel location

Second toggle position

XVTOG3

0 to 8191 pixel location

Third toggle position

XVTOG4

0 to 8191 pixel location

Fourth toggle position

XVTOG5

0 to 8191 pixel location

Fifth toggle position

XVTOG6

0 to 8191 pixel location

Sixth toggle position

XV1

PROGRAMMABLE SETTINGS:

1START POLARITY (LOCATED IN V-SEQUENCE REGISTERS).

2FIRST TOGGLE POSITION.

3SECOND TOGGLE POSITION (A TOTAL OF SIX TOGGLE POSITIONS ALSO AVAILABLE FOR MORE COMPLEX PATTERNS).

4TOTAL PATTERN LENGTH FOR ALL VERTICAL OUTPUTS (LOCATED IN VERTICAL SEQUENCE REGISTERS).

START POSITION OF VERTICAL PATTERN GROUP IS PROGRAMMABLE IN VERTICAL SEQUENCE REGISTERS.

XV2

XV12

Figure 36. Vertical Pattern Group Programmability

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