7 PICOSCALE CONTROL GUI
7.3.1 Trigger Source configuration
Figure 7.8: Trigger Source Configuration; highlighted by green boxes
A trigger source is a basic component in the
FPGA, which may be con
fi
gured to listen to speci
fi
c
events and react in a speci
fi
c way. The con
fi
guration of a trigger source can be controlled within
the
Advanced Trigger System
panel. This enables access to speci
fi
c properties, which are explained
in detail in the Programmer
’
s Guide. The table on the right part of
fi
gure 7.8 presents the values
of the corresponding trigger source con
fi
guration properties, thus, providing an overview of all
enabled trigger sources.
I
n the center of
fi
gure 7.8 you can select one of the eight available trigger sources. You can then
select the desired trigger source
Event
. This is the signal to which the trigger source listens to. The
meaning of the other
fi
elds depends on the chosen
Event
. The GU
I
disables unnecessary
fi
elds
and updates the names of the controls.
Trigger Event
None
The
fi
rst
Event
is
None
. This event disables a trigger source and its output will remain in the logical
LOW state. All other register
fi
elds are not used and have no meaning.
Trigger Event
Software
The
Software
event performs a state change of the trigger source when a software event is re-
ceived. To generate a software event, the AP
I
o
ff
ers a special trigger source property
Software
Trigger
, which can be addressed using the
Property Dialog
(see section 7.9). For this event, the
I
ndex 0 register holds the
Software Trigger ID
, a number that is compared to the trigger
I
D given
by the software event. On a match the trigger source switches to the state given by the property
value.
56
PicoScale User Manual
