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AD9991

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Vertical Pattern Groups (VPAT)

The vertical pattern groups deﬁne the individual pulse patterns

for each V1–V6 output signal. Table V summarizes the registers

available for generating each of the 10 V-pattern groups. The start

polarity (VPOL) determines the starting polarity of the ver ti-

cal sequence, and can be prog rammed high or low for

each V1–V6 output. The ﬁrst, second, and third toggle posi-

tion (VTOG1, VTOG2, VTOG3) are the pixel locations within

the line where the pulse transitions. A fourth toggle position

(VTOG4) is also available for V-Pattern Groups 8 and 9. All tog-

gle positions are 12-bit values, allowing their placement anywhere

in the horizontal line. A separate register, VPATSTART, speciﬁes

the start position of the V-pattern group within the line (see the

Vertical Sequences section). The VPATLEN register designates

the total length of the V-pattern group, which will determine the

number of pixels between each of the pattern repetitions, when

repetitions are used (see the Vertical Sequences section).

The FREEZE and RESUME registers are used to temporarily

stop the operation of the V1–V6 outputs. At the pixel location

speciﬁed in the FREEZE register, the V1–V6 outputs will be

held static at their current dc state, high or low. The V1–V6

outputs are held until the pixel location speciﬁed by RESUME

vided, allowing the vertical outputs to be interrupted twice in

the same line. The FREEZE and RESUME positions are pro-

grammed in the V-pattern group registers, but are separately

enabled using the VMASK registers, which are described in the

Vertical Sequence section.

Table V. Vertical Pattern Group Registers

Length

Range

Description

VPOL

High/Low

Starting Polarity of Each V1–V6 Output

VTOG1

12b

0–4096 Pixel Location

First Toggle Position within Line for Each V1–V6 Output

VTOG2

12b

0–4096 Pixel Location

Second Toggle Position within Line for Each V1–V6 Output

VTOG3

12b

0–4096 Pixel Location

Third Toggle Position within Line for Each V1–V6 Output

VTOG4

12b

0–4096 Pixel Location

Fourth Toggle Position, only Available in V-Pattern Groups 8 and 9

VPATLEN

12b

0–4096 Pixels

Total Length of Each V-Pattern Group

FREEZE1

12b

0–4096 Pixel Location

Holds the V1–V6 Outputs at Their Current Levels (Static DC)

RESUME1

12b

0–4096 Pixel Location

Resumes Operation of the V1–V6 Outputs to Finish Their Pattern

FREEZE2

12b

0–4096 Pixel Location

Holds the V1–V6 Outputs at Their Current Levels (Static DC)

RESUME2

12b

0–4096 Pixel Location

Resumes Operation of the V1–V6 Outputs to Finish Their Pattern

PROGRAMMABLE SETTINGS FOR EACH V-PATTERN:

1. START POLARITY

2. FIRST TOGGLE POSITION

3. SECOND TOGGLE POSITION (THIRD TOGGLE POSITION ALSO AVAILABLE, FOURTH TOGGLE POSITION AVAILABLE FOR V-PATTERN GROUPS 8 AND 9)

4. TOTAL PATTERN LENGTH FOR ALL V1–V6 OUTPUTS

START POSITION OF V-PATTERN GROUP IS PROGRAMMABLE IN V-SEQUENCE REGISTERS

Figure 16. Vertical Pattern Group Programmability

REV. 0

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