AD9992BBCZ datasheet(28/92 Pages) AD

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AD9992

Rev. C | Page 28 of 92

Vertical Pattern Groups (VPAT)

The vertical pattern groups define the individual pulse patterns for

each XV1 to XV24 output signal. Table 13 summarizes the registers

available for generating each of the V-pattern groups. The first,

second, third, and fourth toggle positions (XVTOG1, XVTOG2,

XVTOG3, and XVTOG4) are the pixel locations within the line

where the pulse transitions. All toggle positions are 13-bit values,

allowing their placement anywhere in the horizontal line.

More registers are included in the vertical sequence registers to

specify the output pulses. VPOL specifies the start polarity for

each signal; VSTART specifies the start position of the V-pattern

group within the line; VLEN designates the total length of

the V-pattern group, which determines the number of pixels

between each of the pattern repetitions when repetitions are used.

The VSTART position is actually an offset value for each toggle

position. The actual pixel location for each toggle, measured

from the HD falling edge (Pixel 0), is equal to the VSTART value

plus the toggle position.

When the selected V-output is designated as a VSG pulse, either

the XVTOG1/XVTOG2 or XVTOG3/XVTOG4 pair is selected

using V-Sequence Address 0x02, VSGPATSEL. All four toggle

positions are not simultaneously available for VSG pulses.

Unused V-channels must have their toggle positions programmed

to either 0 or maximum value. This prevents unpredictable

behavior because the default values of the V-pattern group registers

are unknown.

Table 13. Vertical Pattern Group Registers

Length

Description

XVTOG1

13b

First toggle position within line for each XV1 to XV24 output, relative to VSTART value.

XVTOG2

13b

Second toggle position, relative to VSTART value

XVTOG3

13b

Third toggle position, relative to VSTART value

XVTOG4

13b

Fourth toggle position, relative to VSTART value

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

PROGRAMMABLE SETTINGS:

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

2FIRST TOGGLE POSITION.

3SECOND TOGGLE POSITION (THIRD AND FOURTH TOGGLE POSITIONS ALSO AVAILABLE FOR MORE COMPLEX PATTERNS).

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

XV1

XV2

XV24

Figure 34. Vertical Pattern Group Programmability

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