Prosilica GE Technical Manual V2.2.1
52
Camera interfaces
Trigger rules
•
The end of exposure will always trigger the next readout.
•
The end of exposure must always end after the current readout.
•
The start of exposure must always correspond with the interline time if
readout is true.
•
Exposure start delay equals the readout time minus the registered
exposure time.
Triggering during the idle state
For applications requiring the shortest possible
Trigger Latency
and the
smallest possible
Trigger Jitter
the
User Trigger
signal should be applied when
Imaging
is false and
Idle
is true. In this case,
Trigger Latency
and
Trigger Jitter
are as indicated in the camera
specifications
.
Triggering during the readout state
For applications requiring the fastest triggering cycle time whereby the
camera image sensor is exposing and reading out simultaneously, apply the
User Trigger
signal as soon as a valid
Trigger Ready
is detected. In this case,
Trigger Latency
and
Trigger Jitter
can be up to 1 row time since
Exposure
must
always begin on an
Interline
boundary.
Trigger ready
Indicates to the user that the camera will accept
the next trigger
Registered exposure
time
Exposure time value currently stored in the camera
memory
Exposure start delay
Registered exposure time subtracted from the
readout time and indicates when the next
exposure cycle can begin such that the exposure
will end after the current readout
Interline time
Time between sensor row readout cycles
Imaging
High when the camera image sensor is either
exposing and/or reading out data
Idle
High if the camera image sensor is not exposing
and/or reading out data
Note
The user trigger pulse width should be at least three times the
width of the trigger latency as indicated in Chapter
Specifications
on page 14.
Term
Definition
Table 16: Explanation of signals in timing diagram (continued)
