ADLINK cPCI-9116 - Manual (Page 56)

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• Operation Theory
Post-Trigger or Delay-trigger Acquisition with re-trigger
Use post-trigger or delay-trigger acquisition with re-trigger function in
applications where you want to collect data after several external trigger events.
The number of scans after each trigger is specified in SC_counter, and users
could program Retrig_no to specify the number of re-triggers. Fig 18
illustrates an example. In this example, 2 scans of data is acquired after the
first trigger signal, then the board waits for the re-trigger signal (re-trigger
signals which occur before the first 2 scans of data is acquired will be ignored).
When the re-trigger signal occurs, the board scans 2 more scans of data. The
process repeats until the specified amount of re-trigger signals are detected.
The total acquired data length = DIV_counter * SC_counter * Retrig_no.
(DIV_Counter=4, SC_Counter=2, retrig_no=3)
Acquisition_in_progress
Scan_start
AD_conversion
Scan_in_progress
(SSH_OUT)
Acquired & stored data
(6 scans)
Operation start
ExtTrg
Figure 18: Post trigger with re-trigger