AD9923ABBCZ datasheet(27/88 Pages) AD

27 / 88 page

AD9923A

Rev. 0 | Page 27 of 88

Vertical Sequences (VSEQ)

A vertical sequence (VSEQ) is created by selecting one of the

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

horizontal clamping and blanking information. Each VSEQ is

programmed using the registers shown in Table 15. Figure 37

shows how each register is used to generate a V-sequence.

The VPATSELA and VPATSELB registers select the V-pattern

group that is used in a given V-sequence. Having two groups

available allows each vertical output to be mapped to a different

V-pattern group. The selected V-pattern group can have

repetitions added for high speed line shifts or 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 the pixel

location where the V-pattern group starts. The VMASK register is

used in conjunction with the FREEZE/RESUME registers to enable

optional masking of the XV 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. Note that the last line of the

field can be programmed separately using the HDLAST register,

located in the field register (see Table 16).

VREP 3

XV1 TO XV13

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.

V-PATTERN GROUP

CLPOB

PBLK

HBLK

VREP 2

Figure 37. V-Sequence Programmability

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