AD9895 データシートの表示（PDF） - Analog Devices
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AD9895 Datasheet PDF : 58 Pages
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AD9891/AD9895
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 #0
ONLY FIRST LINES ARE USED
REGION CHANGE POSITION #1
SINGLE FIELD (1 VD INTERVAL)
NO ALTERNATION
FIRST LINES
SECOND LINES
LINE-BY-LINE ALTERNATION
REGION CHANGE POSTION #2
ONLY FIRST LINES ARE USED
NO ALTERNATION
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
HD
USE SECOND V SEQUENCES
USE FIRST V SEQUENCES
V1
V2
V3
V4
SEQUENCES MAY BE ALTERNATED WITHIN A REGION BY USING THE SPTRFIRST AND SPTRSECOND REGISTERS.
Figure 24. Example of Line Alteration within a Region
Register
Length
VTPALT
1b
VxSPTRFIRST
4b
VxINVFIRST
1b
VxSPTRSECOND 4b
VxINVSECOND 1b
x is the V-output from 1–4.
Table X. Vertical Sequence Alternation Parameters
Range
Enabled/Disabled
Sequence 0–11
High/Low
Sequence 0–11
High/Low
Description
Enables the Line-by-Line Alternation (1 = Enabled)
SPTR for Vx Output during Each Region 0–4 for FIRST Lines
When High, the Polarity of VxSPTRFIRST Is Inverted
SPTR for Vx Output during Each Region 0–4 for SECOND Lines
When High, the Polarity of VxSPTRSECOND Is Inverted
REV. A
–21–
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