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Description of the data path
•
Standard Parameter Update Timing (slightly modified from previous
PIKE cameras)
•
New: Quick Format Change Mode
In the following you find a short description of both timing modes:
Standard Parameter Update Timing
The Standard Parameter Update Timing keeps the frame rate constant and
does not create any gaps between two image transfers via bus (precondition:
exposure (shutter) time must be smaller than transfer time).
•
Frame rate / transfer rate is always constant
(if shutter time < transfer time)
•
Delay from shutter update until change takes place is always 2 frames
(delay from update command reception by FPGA and not by microcon-
troller)
•
Parameters sent to the camera faster than max. frame rate are no longer
stored in a FIFO. The last sent parameter will be activated for the next
image. All others will be dropped. This ensures that the last image is
shot with the last shutter setting.
New: Quick Format Change Mode (QFCM)
The Quick Format Change Mode creates gaps between two images. Current
exposure is interrupted and the new exposure is started immediately with
new parameters if during exposure (integration/shutter) an new shutter com-
mand is received.
•
Frame rate / transfer rate can be interrupted. This is shown in the dia-
gram below whenever FVal goes low after a reception of a new shutter
command while Sync was low.
•
Shutter will be interrupted, if the update command is received while
camera integrates
•
Delay from shutter update until change takes place is always 1 frame
(the delay is calculated from update command reception by FPGA and
not by microcontroller)
Figure 81: Quick Format Change Mode
PIKE Technical Manual V4.1.0
136
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