ALLIED Vision Technologies Stingray F-504 - Manual (Page 164)

Description of the data path
STINGRAY Technical Manual V4.4.4
162
To optimize the transfer of parameter changes there is a new timing mode
called Quick Format Change Mode, which effectively resets the current shut-
ter.
Therefore you can choose between the following update timing modes:
• Standard Parameter Update Timing
• 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.