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AD9927

Rev. 0 | Page 41 of 100

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 49 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 different fields.

The SEQ registers, one for each region, select which of the

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

registers 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 signals 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. The individual SG

patterns are created separately using the SG pattern registers.

The SGACTLINE1 register specifies which line in the field

contains the VSG outputs. 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 no.

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 no.

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 TOG1, TOG2; 1 = use TOG3, TOG4).

…

[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 no.

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

SGACTLINE2

13b

0 to 8191 line no.

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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