AD9992BBCZ datasheet(39/92 Pages) AD

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AD9992

Rev. C | Page 39 of 92

Complete Field: Combining V-Sequences

After the V-sequences are created, they are combined to create

different readout fields. A field consists of up to nine regions,

and within each region, a different V-sequence can be selected.

Figure 48 shows how the sequence change positions (SCP)

designate the line boundary for each region and how the SEQ

registers then select which V-sequence is used in each region.

Registers to control the VSG outputs are also included in the field

registers. Table 17 summarizes the registers used to create the

fields.

The SEQ registers, one for each region, select which V-sequences

are active in each region. The MULT_SWEEP registers, one for

each region, are used to enable sweep mode and/or multiplier

mode in any region. The SCP registers create the line boundaries

for each region. The VDLEN register specifies the total number of

lines in the field. The HDLEN register specifies the total number of

pixels per line, and the HDLASTLEN register specifies the

number of pixels in the last line of the field.

The VPATSECOND register is used to add a second V-pattern

group to the XV1 to XV10 outputs in the vertical sensor gate

(VSG) line. The SGMASK register is used to enable or disable each

individual VSG output. There are two bits for each VSG output

to enable separate masking in SGACTLINE1 and SGACTLINE2.

Setting a masking bit high masks the output; setting it low enables

the output. The VSGPATSEL register assigns one of the eight

SG patterns to each VSG output. Individual SG patterns are created

separately using the SG pattern registers. The SGACTLINE1

The optional SGACTLINE2 register allows the same VSG pulses to

be repeated on a different line. Separate masking is not available

for SGACTLINE1 and SGACTLINE2.

Table 17. Field Registers (CLPOB, PBLK Masking Shown in Table 10)

Length

Range

Description

SEQx

0 to 31 V-sequence number

Selected V-sequence for each region in the field.

MULT_SWEEP

0 to 3

Enables multiplier mode and/or sweep mode for each region.

0: Multiplier off, sweep off.

1: Multiplier off, sweep on.

2: Multiplier on, sweep off.

3: Multiplier on, sweep on.

SCP

13b

0 to 8191 line number

Sequence change position for each region.

VDLEN

13b

0 to 8191 lines

Total number of lines in each field.

HDLASTLEN

13b

0 to 8191 pixels

Length in pixels of the last HD line in each field.

VSGPATSEL

24b

High/low

VSGPATSEL selects which V-pattern toggle positions are used. When set to 0,

Toggle 1 and Toggle 2 are used. When set to 1, Toggle 3 and Toggle 4 are used.

[0]: XV1 selection (0 = use XVTOG1, XVTOG2; 1 = use XVTOG3, XVTOG4).

…

[23]: XV24 selection.

SGMASK

24b

High/low, each VSG

Set high to mask each individual VSG output.

[0]: XV1 mask.

…

[23]: XV24 mask.

SGACTLINE1

13b

0 to 8191 line number

Selects the line in the field where the VSG signals are active.

SGACTLINE2

13b

0 to 8191 line number

Selects a second line in the field to repeat the VSG signals. If not used,

set this equal to SGACTLINE1 or to the maximum value.

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