參數(shù)資料
型號: SCM20014
廠商: Motorola, Inc.
英文描述: VGA Digital Image Sensor(VGA數(shù)字圖像傳感器)
中文描述: VGA數(shù)碼圖像傳感器(顯卡數(shù)字圖像傳感器)
文件頁數(shù): 27/54頁
文件大小: 911K
代理商: SCM20014
SCM20014
MOTOROLA
27
Preliminary!! Last Update: 12/14/99
The
Column DOVA Control Register; Table 18
, is used
to control the Column DOVA functionality and opera-
tional modes.
Setting bit
ece
enables the per-column DOVA to be
used and the per-column offset values loaded into the
DOVA RAM will be applied to the pixel output. The glo-
bal DOVA adjust circuit is enabled by default.
Setting the
cntr
bit resets the internal counter used to
repetitively load the RAM with user defined data. This is
used in cases where the system controller loses control
of the I
2
C bus while writing to the Column DOVA RAM.
Setting the
cal
bit configures the Column DOVA RAM
using internally generated offset data. When the
SCM20014 is first initiated, it will automatically generate
and load the Column DOVA RAM with the appropriate
data. However, if operational conditions such as tem-
perature or operating frequency change, the user can
use the
cal
bit to re-determine the appropriate column
data.
The automatic calibration data is calculated using the
average differential offset across four dark rows. This
feature does not create the most effective data for re-
ducing the column oriented fixed pattern noise of the
device. The user can calculate the column offset data
using their own algorithm and load this data via the I
2
C
bus as defined in this section.
Address
20
h
Column DOVA DC
Default
00
h
msb (7)
6
5
4
3
2
1
lsb (0)
x
x
cdd[5]
cdd[4]
cdd[3]
cdd[2]
cdd[1]
cdd[0]
Bit
Number
Function
Description
Reset
State
7 - 6
Unused
Unused
xx
5
Sign
0
b
= Positive Offset
1
b
= Negative Offset
0
b
4 - 0
Column
DC Offset
Offset = 2 * cdd
d
00000
b
Table 17. Column DOVA DC Register
Address
21
h
Column DOVA Control
Default
00
h
msb (7)
6
5
4
3
2
1
lsb (0)
fuo
fuo
fuo
ece
fuo
fuo
cntr
cal
Bit
Number
Function
Description
Reset
State
7 - 5
FUO
Factory Use Only
000
b
4
Column
DOVA
Enable
1
b
= Column DOVA enabled (Register 22
h
)
0
b
= Global DOVA enabled (Register 20
h
)
0
b
Table 18. Column DOVA Control Register
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