Version 1.0 rev 14 Aug 2019
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In this section, both External and Software Trigger are described in the same diagram as the acquisition sequence is the
same. The trigger event can either be from the EXT Trigger input or sent via software. While waiting on the trigger event,
the sensor is put into a “pre-scan read out cycle” which performs a continuous Rolling Reset which ensures that charge
build up on the sensor is kept to a minimum while waiting for the trigger event. The ARM signal is asserted to indicate it
is ready to detect an incoming trigger input.
Once the trigger event is detected, a Rolling Reset is initiated. When the exposure period has completed, a signal frame
read out phase begins. Once the frame has been read out, the Arm signal goes high and the camera waits for the next
trigger event to be detected.
The external trigger is fed via the EXT Trigger input on the I/O Connector on the camera head or via the EXT trigger input
on the CoaXPress card.
Figure 15: Rolling Shutter - External Triggering (Part 1: exposures separated).
