ADLINK PCIe-9852 - Manual (Page 30)

20 Operations
3.4.4 Middle Trigger Mode
Collects data before and after the trigger event, with the amount to
be collected set individually (M and N samples), as follows
Figure 3-8: Middle Trigger Mode Acquisition
3.4.5 Acquisition with Re-Triggering
A digitizer acquires a trace of N samples/channel for a single
acquisition. Re-Trigger mode can also be set to automatically
acquire R traces, containing N*R samples/channel of data, without
additional software intervention.
The Re-Trigger setting can be used for Post-Trigger and Delayed-
Trigger modes, with different limitations on the spacing between
trigger events in each mode. Trigger events arriving too close to
the previous instance will be ignored by the digitizer.
X
In Post-Trigger mode, the minimum spacing between trigger
events is N+1
X
In Delayed-Trigger mode, the minimum spacing between
trigger events is (N+D)+1, where D is the number of the
delayed setting
Time
Operation start
Acquisition start
Trigger
Data
Acquisition stop
Data transfer to system begins
N samples M samples
Trigger event occurs