AD9925BBCZRL datasheet(24/96 Pages) AD

24 / 96 page

AD9925

Rev. A | Page 24 of 96

ixel locations within the line where the pulse transitions. A

ourth toggle position (XVTOG4) is also available for vertical

pattern groups 8 and 9. All toggle positions are 12-bit values,

allowing their placement anywhere in the horizontal line. A

the

ces

llows the AD9925 to remain back-

ward-compatible with the AD9995 register settings while still

providing additional flexibility with XV7 and XV8 for new CCDs.

Table 13. Vertical Pattern Group Registers

Length

Range

Description

Vertical Pattern Groups (VPAT)

The vertical pattern groups define the individual pulse patterns

for each XV1 to XV6 output signal. Table 13 summarizes the

registers available for generating each of the 10 vertical pattern

groups. The start polarity (VPOL) determines the starting

polarity of the vertical sequence and can be programmed high

or low for each XV1 to XV6 output. The first, second, and third

toggle positions (XVTOG1, XVTOG2, and XVTOG3) are the

separate register, VPATSTART, specifies the start position of

vertical pattern groups within the line (see the Vertical Sequen

(VSEQ) section). The VPATLEN register designates the total

length of the vertical pattern group, which determines the number

of pixels between each of the pattern repetitions when repetitions

are used (see the Vertical Sequences (VSEQ) section).

Additional VPAT groups are provided in Register Bank 3 for t

XV7 and XV8 outputs. This a

XVPOL

1 b

High/Low

Starting Polarity of Each XV Output

XVTOG1

12 b

0 to 4096 Pixel Location

First To

for Each XV Output

ggle Position within Line

XVTOG2

12 b

0 to 4096 Pixel Location

Second To

Line for Each XV Output

ggle Position within

XVTOG3

12 b

0 to 4096 Pixel Location

Third Toggle Position within Line for Each XV Output

XVTOG4

12 b

0 to 4096 Pixel Location

Fourth Toggle Po

rtical Pattern Groups 8 and 9 and Also in

XV7 and XV8 Vertical Pattern Groups

VPATLEN

12 b

0 to 4096 Pixels

sition, Only Available in Ve

Total Length of Each Vertical Pattern Group

FREEZE1

12 b

0 to 4096 Pixel Location

Holds the XV Outputs at Their Current Levels (Static DC)

RESUME1

12 b

0 to 4096 Pixel Location

Resumes Operation of the XV Outputs to Finish Their Pattern

FREEZE2

12 b

0 to 4096 Pixel Location

Holds the XV Outputs at Their Current Levels (Static DC)

RESUME2

12 b

0 to 4096 Pixel Location

Resumes Operation of the XV Outputs to Finish Their Pattern

XV1

PROGRAMMABLE SETTINGS FOR EACH VERTICAL PATTERN:

1. START POLARITY.

2. FIRST TOGGLE POSITION.

3. SECOND TOGGLE POSITION (THIRD TOGGLE POSITION ALSO AVAILABLE,

FOURTH TOGGLE POSITION AVAILABLE FOR VERTICAL PATTERN GROUPS 8 AND 9).

4. TOTAL PATTERN LENGTH FOR ALL XV OUTPUTS.

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

XV2

XV6

Figure 31. Vertical Pattern Group Programmability

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