Instruction manual

Marlin Technical ManualV.2.7.0
98
Description of the data path
Parameter update timing
Marlin cameras show the following timing behavior:
• Frame rate or transfer rate is always constant (precondition:
shutter  transfer time)
• The delay from shutter update until the change takes place: up to 3 frames.
Figure 58: Marlin update timing on page 98 demonstrates this behavior. It
shows that the camera receives a shutter update command while the sen-
sor is currently integrating (Sync is low) with shutter setting 400. The cam-
era continues to integrate and this image is output with the next FVal. The
shutter change command becomes effective with the next falling edge of
sync and finally the image taken with shutter 200 is output with a consider-
able delay.
• Parameters that are sent to the camera faster than the max. frame rate per
second are stored in a FIFO and are activated in consecutive images.
Principally a Marlin camera is not able to recognize how many parameter the
user will change. Due to the fact that communication between host and camera
is asynchronous, it may happen that one part of parameter changes is done in
image n+1 and the other part is done in image n+2.
Figure 58: Marlin update timing
Shutter Update Command
Current Charge Time
Sync
FVal
400 200
integrates image
with
with shutter eg 400
continues integrating
outputs image
with shutter 400
outputs image
with shutter 200
shutter 200