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PYTHON480 データシート(PDF) 23 Page - ON Semiconductor

部品番号 PYTHON480
部品情報  Megapixel Global Shutter CMOS Image Sensor
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Dynamic Readout Parameters
It is possible to reconfigure the sensor while it is acquiring
images. Frame related parameters are internally
resynchronized to frame boundaries, such that the modified
parameter does not affect a frame that has already started.
However, there can be restrictions to some registers as
shown in Table 16. Some reconfiguration may lead to one
frame being blanked. This happens when the modification
requires more than one frame to settle. The image is blanked
out and training patterns are transmitted on the data and sync
channels.
Table 16. DYNAMIC READOUT PARAMETERS
Group
Addresses
Description
Subsampling
192[7]
Subsampling is synchronized to a new frame start.
ROI configuration
195
256–265
A ROI switch is only detected when a new window is selected as the active window
(reconfiguration of register 195). reconfiguration of the ROI dimension of the active win-
dow does not lead to a frame blank and can cause a corrupted image.
Exposure
reconfiguration
199−203
Exposure reconfiguration does not cause artifact. However, a latency of one frame is ob-
served unless reg_seq_exposure_sync_mode is set to ‘1’ in triggered global mode (mas-
ter).
Gain reconfiguration
204−205
Gains are synchronized at the start of a new frame. Optionally, one frame latency can be
incorporated to align the gain updates to the exposure updates
(refer to register 204[13] − gain_lat_comp).
Freezing Active Configurations
Though the readout parameters are synchronized to frame
boundaries, an update of multiple registers can still lead to
a transient effect in the subsequent images, as some
configurations require multiple register uploads. For
example, to reconfigure the exposure time in master global
mode, both the fr_length and exposure registers need to be
updated. Internally, the sensor synchronizes these
configurations to frame boundaries, but it is still possible
that the reconfiguration of multiple registers spans over two
or even more frames. To avoid inconsistent combinations,
the active configurations can be frozen while altering the
SPI registers by disabling synchronization for the
corresponding functionality before reconfiguration. When
all registers are uploaded, re−enable the synchronization.
The sensor’s sequencer then updates its active set of
registers and uses them for the coming frames. Freezing of
the active set of registers can be programmed in the
sync_configuration registers, which can be found at the SPI
address 206.
Figure 19 shows a reconfiguration that does not use the
sync_configuration option. As depicted, new SPI
configurations are synchronized to frame boundaries.
Figure 20 shows the usage of the sync_configuration
settings. Before uploading a set of registers, the
corresponding sync_configuration is de−asserted. After the
upload is completed, the sync_configuration is asserted
again and the sensor resynchronizes its set of registers to the
coming frame boundaries. As seen in the figure, this ensures
that the uploads performed at the end of frame N+2 and the
start of frame N+3 become active in the same frame (frame
N+4).
Figure 19. Frame Synchronization of Configurations (no freezing)
Frame NFrame N+1 Frame N+2 Frame N+3
Frame N+4
Time Line
SPI Registers
Active Registers


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