JYTEK PCIe-69834, User Manual

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Operations 19
Figure 3-5: Post-Trigger Acquisition
3.4.2 Delayed Trigger Mode
Delayed-trigger acquisition is utilized to postpone data collection
after the trigger event, as shown. When the PCIe-
69834
receives
a trigger event, a time delay is implemented before
commencing acquisition. The delay is specified by a 16-bit
counter value such that a maximum thereof is the period of
TIMEBASE X (2
16
), and the minimum is the Timebase period.
Figure 3-6: Delayed Trigger Mode Acquisition
3.4.3 Pre-Trigger Mode
Collects data before the trigger event, starting once specified func-
tion calls are executed to begin the pre-trigger operation, and
stopping when the trigger event occurs. If the trigger event occurs
after the specified amount of data has been acquired, the system
stores only data preceding the trigger event by a specified
amount, as follows.