參數(shù)資料
型號(hào)： AD9895KBC
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： CCD Signal Processors with Precision Timing⑩ Generator
中文描述： SPECIALTY CONSUMER CIRCUIT, PBGA64
封裝： PLASTIC, CSPBGA-64
文件頁(yè)數(shù)： 19/59頁(yè)
文件大?。?/td> 599K
代理商： AD9895KBC
REV. A
AD9891/AD9895
–19–
Individual Vertical Regions
The AD9891/AD9895 arranges the individual sequences into re-
gions through
the use of Sequence Pointers (SPTR). Within each
region, different
sequences may be assigned to each V-clock
output. Figure 21 shows the programmability of each region
and Table VIII summarizes the registers needed for generating
each region.
For each individual region, the line length (in pixels) is programmable
using the HDLEN Registers. Each region can have a different
line
length to accommodate various image readout techniques.
The
maximum number of pixels per line is 4096. Also unique to
each
region are the sequence start positions for each V-output,
which are programmed using the VSTART Registers. Each
VSTART is a 12-bit value, allowing the start position to be
placed anywhere in the line. There are five HDLEN Registers,
one for each region. There is a total of 20 VSTART Registers:
one for each V1
–
V4 output, for five different regions.
Note that the last line of the field is separately programmable
using the HDLASTLEN Register.
The Sequence Pointer registers VxSPTRFIRST and
VxSPTRSECOND assign the individual vertical sequences to
each of the V-clock outputs (V1
–
V4) within a given region.
Typically, only the SPTRFIRST Registers are used, with the
SPTRSECOND Registers reserved for generating line-by-line
alternation (see Vertical Sequence Alternation). Any of the 12
individual sequences may also be inverted using the
VxINVFIRST and VxINVSECOND Registers, effectively dou-
bling the number of sequences available. There is one
SPTRFIRST Register for each V-output, for a total of four regis-
ters per region. If all five regions are used, there is a total of 20
SPTRFIRST Registers. There is also the same number of
SPTRSECOND Registers, if alternation is required.
Note that the
SPTR Registers are four bits wide; if a value greater than 11 is
programmed, the Vx output will be dc at the level of the
VxINV Register.
V1
V2
V1 USES SEQUENCE 2
V3
V4
HD
V2 USES SEQUENCE 2,
WITH DIFFERENT START POSITION
V3 USES SEQUENCE 2, INVERTED
V4 USES SEQUENCE 2, INVERTED,
WITH DIFFERENT START POSITION
Figure 20. Example of Inverted V1–V4 Signals Using One Individual Sequence with Inversion
HD
V1–V4
PROGRAMMABLE SETTINGS FOR EACH REGION:
1: START POSITION OF SELECTED SEQUENCE IS SEPARATELY PROGRAMMABLE FOR EACH OUTPUT
2: HD LINE LENGTH
3: SEQUENCE POINTERS (SPTR) TO SELECT AN INDIVIDUAL SEQUENCE FOR EACH OUTPUT
4: ANY SEQUENCES MAY ALSO BE ALTERNATED FOR ADDITIONAL FLEXIBILITY
SEQUENCES A, B, C, D
1
2
3
Figure 21. Individual Vertical Region Programmability
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