AD9920ABBCZ datasheet(34/112 Pages) AD

34 / 112 page

AD9920A

Rev. B | Page 34 of 112

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 15. Figure 43 shows an example of

how these registers are used to generate the V-sequences.

The VPATSELA, VPATSELB, VPATSELC, and VPATSELD

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

Having four groups available allows each vertical output to be

mapped to a different V-pattern. The user can add repetitions to

the selected V-pattern group 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, VSTARTB, VSTARTC, and VSTARTD

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

The VMASK_EVEN and VMASK_ODD registers are used in

conjunction with the FREEZE/RESUME registers to enable

optional masking of the V-outputs. One or more of the

FREEZE1/RESUME1, FREEZE2/RESUME2, FREEZE3/

RESUME3, and FREEZE4/RESUME4 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 (see Table 64).

VREPA_3

XV1 TO XV24

V-PATTERN GROUP

CLPOB

HBLK

VREPA_ 2

PROGRAMMABLE SETTINGS FOR EACH VERTICAL SEQUENCE:

1START POSITION IN THE LINE OF THE 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 43. V-Sequence Programmability

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