AD9891 datasheet(21/58 Pages) AD

21 / 58 page

REV. A

AD9891/AD9895

–21–

Table X. Vertical Sequence Alternation Parameters

Length

Range

Description

VTPALT

Enabled/Disabled

Enables the Line-by-Line Alternation (1 = Enabled)

VxSPTRFIRST

Sequence 0–11

SPTR for Vx Output during Each Region 0–4 for FIRST Lines

VxINVFIRST

High/Low

When High, the Polarity of VxSPTRFIRST Is Inverted

VxSPTRSECOND

Sequence 0–11

SPTR for Vx Output during Each Region 0–4 for SECOND Lines

VxINVSECOND

High/Low

When High, the Polarity of VxSPTRSECOND Is Inverted

x is the V-output from 1–4.

Vertical Sequence Alternation

The AD9891/AD9895 also supports line-by-line alternation of

vertical sequences within any region, as shown in Figure 23.

Table X summarizes the additional registers used to support differ-

ent alternation patterns. To create an alternating vertical pattern,

the VxSPTRFIRST and VxSPTRSECOND Registers are pro-

grammed with the desired sequences to be alternated. The

VTPALT Register must be set HIGH for that region to use

alternation. If VTPALT is LOW, then the VxSPTRSECOND

Registers will be ignored. Figure 24 shows an example of line-

by-line alternation.

REGION CHANGE POSTION #2

SINGLE FIELD (1 VD INTERVAL)

SECOND LINES

FIRST LINES

LINE-BY-LINE ALTERNATION

NO ALTERNATION

REGION CHANGE POSITION #1

ONLY FIRST LINES ARE USED

REGION CHANGE POSTION #0

NO ALTERNATION

ONLY FIRST LINES ARE USED

WHEN THE VTPALT REGISTER IS LOW (NO ALTERNATION), ONLY THE FIRST LINES ARE USED.

Figure 23. Use of Line Alteration in Vertical Sequencing

USE FIRST V SEQUENCES

USE SECOND V SEQUENCES

USE FIRST V SEQUENCES

SEQUENCES MAY BE ALTERNATED WITHIN A REGION BY USING THE SPTRFIRST AND SPTRSECOND REGISTERS.

Figure 24. Example of Line Alteration within a Region

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