AD9927BBCZ datasheet(31/100 Pages) AD

31 / 100 page

AD9927

Rev. 0 | Page 31 of 100

VERTICAL SEQUENCES (VSEQ)

The vertical sequences are created by selecting one of the

V-pattern groups and adding repeats, start position, horizontal

clamping, and blanking information. The V-sequences are

programmed using the registers shown in Table 14. Figure 36

shows how the different registers are used to generate each

V-sequence.

The VPATSELA, VPATSELB, VPATSELC, and VPATSELD

registers select which V-pattern is used in a given V-sequence.

Having four groups available allows different vertical outputs to

be mapped to different V-patterns. The selected V-pattern group

can have repetitions added for high speed line shifts or for line

binning by using the VREP registers for odd and even lines.

Generally, the same number of repetitions is programmed

into both registers. If a different number of repetitions is

required on odd and even lines, separate values can be used for

each register (see the Generating Line Alternation for V-

Sequences and HBLK section). The VSTARTA and VSTARTB

registers specify where in the line the V-pattern group starts.

The VMASK_EN register is used in conjunction with the

FREEZE/RESUME registers to enable optional masking of the

V-outputs. Either or both of the FREEZE1/RESUME1 and

FREEZE2/RESUME2 registers can be enabled.

The line length (in pixels) is programmable using the HDLEN

registers. Each V-sequence can have a different line length to

accommodate various image readout techniques. The maximum

number of pixels per line is 8192. The last line of the field is

programmed separately using the HDLASTLEN register, which

is located in the field register section.

VREP 3

XV1 TO XV24

V-PATTERN GROUP

CLPOB

HBLK

VREP 2

PROGRAMMABLE SETTINGS FOR EACH VERTICAL SEQUENCE:

1START POSITION IN THE LINE OF SELECTED V-PATTERN GROUP.

2HD LINE LENGTH.

3V-PATTERN SELECT (VPATSEL) TO SELECT ANY V-PATTERN GROUP.

4NUMBER OF REPETITIONS OF THE V-PATTERN GROUP (IF NEEDED).

5START POLARITY AND TOGGLE POSITIONS FOR CLPOB AND PBLK SIGNALS.

6MASKING POLARITY AND TOGGLE POSITIONS FOR HBLK SIGNAL.

Figure 36. V-Sequence Programmability

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