AD9974BBCZ datasheet(25/52 Pages) AD

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AD9974

Rev. A | Page 25 of 52

COMPLETE FIELD—COMBINING H-PATTERNS

After the H-patterns are created, they combine to create different

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

determined by the SCP registers. Within each region, a different

H-pattern group can be selected up to a maximum of 32 groups.

Registers to control the H-patterns are located in the field registers.

Table 31 describes the field registers.

H-Pattern Selection

The H-patterns are stored in the HPAT memory, as described in

Table 20. The user decides how many H-pattern groups are

required, up to a maximum of 32, and then uses the HPAT_SEL

registers to select which H-pattern group is output in each

region of the field. Figure 34 shows how to use the HPAT_SEL

and SCP registers. The SCP registers create the line boundaries

for each region.

REGION 0

FIELD SETTINGS:

1. SEQUENCE CHANGE POSITIONS (SCP0-8) DEFINE EACH OF THE NINE AVAILABLE REGIONS IN THE FIELD.

2. HPAT_SEL SELECTS THE DESIRED H-PATTERN FOR EACH REGION.

H-PATTERNS

SCP 1

SCP 2

HPAT_SEL0

HPAT_SEL1

SCP3

HPAT_SEL2

SCP4

HPAT_SEL3

SCP5

HPAT_SEL4

SCP8

HPAT_SEL8

REGION 1

REGION 2

REGION 3

REGION 4

REGION 8

SCP 0

Figure 34. Complete Field Divided into Regions

Table 14. Field Registers

Length (Bits)

Range

Description

SCPx

0 to 8191 line number

Sequence change position for each region. Selects an individual line.

HPAT_SELx

0 to 31 H-patterns

Selected H-pattern for each region of the field.

CLPOB_POL

High/low

CLPOB start polarity settings for each region of the field.

CLPOB_PAT

0 to 9 patterns

CLPOB pattern selector for each region of the field.

CLPOBMASKSTARTx,

CLPOBMASKENDx

Number of lines

CLPOB mask positions for up to three masking configurations.

PBLK_POL

High/low

PBLK start polarity settings for each region of the field.

PBLK_PAT

0 to 9 patterns

PBLK pattern selector for each region of the field.

PBLKMASKSTARTx,

PBLKMASKENDx,

Number of lines

PBLK mask positions for up to three masking configurations.

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