ADLINK cPCI-9116 - Manual (Page 53)

Operation Theory
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(M_Counter=M=3, DIV_Counter=4, SC_Counter=N=1)
Acquisition_in_progress
Scan_start
AD_conversion
Scan_in_progress
(SSH_OUT)(pin47)
Aquired data
Acquired & stored data
(M+N scans) Operation start
ExtTrg(pin46)
M scans before
trigger
N scans
after trigger
Trigger signals which occur in the shadow
region(the first M scans) will be ignored
The first M scans
Figure 14: Middle trigger with M_enable = 1
If an external trigger event occurs when a scan is in progress, the stored N
scans of data would include this scan. And the first stored data will always
be the first channel entry of a scan, as illustrated in Fig 15.