AD9920ABBCZ datasheet(33/112 Pages) AD

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AD9920A

Rev. B | Page 33 of 112

Vertical Pattern Groups (VPAT)

The vertical pattern groups define the individual pulse patterns

for each XV1 to XV24 output signal. Table 14 summarizes the

registers available for generating each V-pattern group. 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 first 8191

pixels of the 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 0x03, 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 14. Vertical Pattern Group Registers

Length (Bits)

Description

VTOG1

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

VTOG2

Second toggle position, relative to VSTART value.

VTOG3

Third toggle position, relative to VSTART value.

VTOG4

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 42. Vertical Pattern Group Programmability

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