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AD9995

–19–

Complete Field: Combining V-Sequences

After the V-sequences have been created, they are combined to

create different readout fields. A field consists of up to seven

different regions, and within each region a different V-sequence

can be selected. Figure 18 shows how the sequence change posi-

tions (SCP) designate the line boundary for each region, and

the VSEQSEL registers then select which V-sequence is used

during each region. Registers to control the VSG outputs are also

included in the Field registers.

Table VII summarizes the registers used to create the different

fields. Up to six different fields can be preprogrammed using all

of the Field registers.

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

10 V-sequences will be active during each region.The SWEEP

registers are used to enable SWEEP mode during any region.

The MULTI registers are used to enable Multiplier mode dur-

ing 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 total number of pixels per line (HDLEN) is

specified in the V-sequence registers, but the HDLAST 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 V1–6 outputs during the sensor gate (VSG) line.

The SGMASK register is used to enable or disable each indi-

vidual VSG output.There is a single bit for each VSG output;

setting the bit high will mask the output, setting it low will enable

the output.The SGPAT register assigns one of the four different

SG patterns to each VSG output.The individual SG patterns are

created separately using the SG pattern registers.The SGLINE1

puts.The optional SGLINE2 register allows the same VSG pulses

to be repeated on a different line.

Table VII. Field Registers

Length

Range

Description

VSEQSEL

0–9 V-Sequence #

Selected V-Sequence for Each Region in the Field.

SWEEP

High/Low

Enables Sweep Mode for Each Region,When Set High.

MULTI

High/Low

Enables Multiplier Mode for Each Region,When Set High.

SCP

12b

0–4095 Line #

Sequence Change Position for Each Region.

VDLEN

12b

0–4095 # of Lines

Total Number of Lines in Each Field.

HDLAST

12b

0–4095 # of Pixels

Length in Pixels of the Last HD Line in Each Field.

VPATSECOND

0–9 V-Pattern Group #

Selected V-Pattern Group for Second Pattern Applied During VSG Line.

SGMASK

High/Low, Each VSG

Set High to Mask Each Individual VSG Output.VSG1 [0],VSG2 [1],

VSG3 [2],VSG4 [3],VSG5 [4].

SGPATSEL

12b

0–3 Pattern #, Each VSG

Selects the VSG Pattern Number for Each VSG Output.VSG1 [1:0],

VSG2 [3:2],VSG3 [5:4],VSG4 [7:6],VSG5 [9:8].

SGLINE1

12b

0–4095 Line #

Selects the Line in the Field where the VSG Are Active.

SGLINE2

12b

0–4095 Line #

Selects a Second Line in the Field to Repeat the VSG Signals.

REGION 0

FIELD SETTINGS:

1. SEQUENCE CHANGE POSITIONS (SCP1–6) DEFINE EACH OF THE 7 REGIONS IN THE FIELD.

2. VSEQSEL0–6 SELECTS THE DESIRED V-SEQUENCE (0–9) FOR EACH REGION.

3. SGLINE1 REGISTER SELECTS WHICH HD LINE IN THE FIELD WILL CONTAIN THE SENSOR GATE PULSE(S).

V1–V6

SCP 1

SCP 2

VSEQSEL0

VSEQSEL1

SCP 3

VSEQSEL2

SCP 4

VSEQSEL3

SCP 5

VSEQSEL4

SCP 6

VSEQSEL5

VSEQSEL6

REGION 1

REGION 2

REGION 3

REGION 4

REGION 5

REGION 6

VSG

SGLINE

SGLINE1

Figure 18. Complete Field Is Divided into Regions

REV. 0

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