AD9927BBCZ datasheet(30/100 Pages) AD

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AD9927

Rev. 0 | Page 30 of 100

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 (VTOG1,

VTOG2, VTOG3, and VTOG4) 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 VTOG1/VTOG2 or VTOG3/VTOG4 pair is selected using

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

are not simultaneously available for VSG pulses.

All 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

VTOG1

13b

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

VTOG2

13b

Second toggle position, relative to VSTART value

VTOG3

13b

Third toggle position, relative to VSTART value

VTOG4

13b

Fourth toggle position, relative to VSTART value

XV1

XV2

XV24

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).

Figure 35. Vertical Pattern Group Programmability

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