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參數資料
| 型號： | XRD98L63ZEVAL |
| 廠商： | Exar Corporation |
| 文件頁數： | 14/41頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR XRD98L63 |
| 標準包裝： | 1 |
| 系列： | * |
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21
Rev.1.01
XRD98L63
Figure 13. Example of Ignoring Fringe Pixels Using OBdel[2:0]
OBdel[1:0]
Number of
Fringe Pixels
to Ignore
00
0
01
1
10
2
11
3
Hold Mode
The purpose of this mode is to prevent any changes in
the Fine or Coarse accumulators. This mode is in-
tended to optimize digital still camera applications
(DSC). The idea is to first run the calibration normally
so the Fine and Coarse accumulators converge on the
correct values to achieve the programmed Offset
Code. Then, just before acquiring the final image data,
activate the Hold mode. This will ensure the black level
offset of the CDS/PGA does not change while the final
image is being transferred out of the CCD. Once the
image has been acquired from the CCD, turn off the
Hold mode so the chip can continue to compensate for
any changes in offset due to temperature drift or other
effects.
To activate the Hold mode, write a “1” to the CAL Hold
bit in the Calibration register. By default, the Hold
mode is not active.
Manual Mode
The purpose of the Manual Mode is to disable the
automatic calibration feature and allow a system to
write directly to the Coarse and Fine Offset Adjust
DACs. When Manual mode is enabled, the Coarse
Offset DAC (CDAC) is programmed by writing to the
CDAC Even register, CDE[8:0]; the Fine Offset DAC is
programmed by writing to the FDAC Even register,
FDE[9:0].
If the Multiple Gain Mode is enabled, then the CDAC
Odd register and the FDAC Odd register are also used
to program the Offset Adjust DACs.
To activate the Manual mode, write a ”1” to the ManCal
bit in the Calibration register. By default, the Manual
mode is not active.
Ignoring Fringe Pixels
Fringe pixels are the first few OB pixels at the edge of
the metal shield. Usually, these pixels receive some
reflected and/or scattered light, so they do not repre-
sent true “Optical Black”. If the CAL signal is active
while the CCD outputs Fringe pixels, the Calibration
logic will not converge properly. The OBdel[1:0] param-
eter can be used to tell the Calibration logic to ignore (or
delete) the first 0-3 OB pixels every time the CAL signal
is activated.
Table 6. Ignoring Fringe Pixels
CCD
CAL
V
OB OB OB OB OB OB OB OB OB OB
Fr
V
Active Video pixels
Fringe pixels
Good Optical Black pixels
Light
Metal Shield
OB
Ignore these 3 pixels by
setting OBdel[1:0]=11
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