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The frame sync count triggers and output a signal at a certain period. The period is measured in trigger
events.
4.12.3 Triggering external equipment with internal trigger
Triggering external equipment and the digitizer with the internal trigger may be done in two ways; inter-
nally,
Figure 18
and externally,
The internal connection is preferred when the trigger is only used for triggering the digitizer. The trigger-
ing is then done inside the FPGA as a logical signal and the trigger time is guaranteed to be exact on
the expected sample.
The external connection is preferred when the trigger is used for triggering both the digitizer and the
external equipment. Then the ADQ will listen to the same physical signal as the external equipment is
using.
,
"
#
DESCRIPTION
a
Internal trigger generator
b
Select internal trigger as output
c
–
d
Select internal trigger as trigger source
e
Acquisition engine creates a record from streaming data
Figure 18: Internal routing of internal trigger.
19-2302 A
2020-09-16
Figure
19.
$ %
$%
$% *
$.%
$
%
*
*
+,+-
USER COMMAND
SetInternalTriggerPeriod
SetupTriggerOutput
–
SetTriggerMode
ADQ8-4X Manual
19-2302 A 2020-09-16
27(46)
,
' '
/0
/&' (
REF
4.11
4.12
–
7
27(46)
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