ADLINK Technology MCM-216, User Manual

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event by a specified amount, as shown. Note that N must be
equal to or less than 8k samples for all analog input channels.
Figure 3-21: Pre-trigger Mode Operation (valid trigger only)
The trigger event occurs after the specified amount of data has
been acquired. However, if the trigger event occurs before the
specified amount of data has been acquired, the acquisition
engine ignores the trigger signal until the specified amount of
data has been acquired, as shown.
Figure 3-22: Pre-trigger Mode Operation (w/ invalid trigger)
Time
Ɣ
Operation start
Ɣ Acquisition start
Trigger
Data
Ɣ Trigger Event Occurs
Ɣ
Acquisition stop
Ɣ
Begin to transfer data to
system
N samples
This data is
discarded.
Only acquired N
samples will be
transferred back to
system.
Time
Ɣ
Operation start
Ɣ
Acquisition start
Trigger
Data
Ɣ
Trigger Event Occurs
Ɣ Acquisition stop
Ɣ Begin to transfer data to system
N samples
X samples have been acquired
before trigger occurs, where
X<N
Ɣ
Trigger signals that occur before
the specified amount of data has
been acquired are ignored