DAP Technology 1394, Operation Manual

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Filter/Trigger
205 Copyright © DapTechnology B.V., 2005-2019 - All Rights Reserved., 5/20/2019
The most important part for the trigger settings is the Trigger Sequencer, see left pane in example
above. Here you can graphically define a trigger program by adding items to the flow and change theire
properties. By executing the program you can generate a Recorder trigger when a particular sequence of
packets or events has been detected.
The most typical items in this flow are: the Wait, the Jump and the Action item. With the Wait item you
can instruct the trigger sequencer to wait for a packet, an acknowledge, an event or any combination of
them. The next item will not be executed until the packet, acknowledge or event has been reveived. Such
a Wait is typically followed by one or more Jump items that can check what kind of packet, acknowledge
or event was received. The Jump can for instance check if a received packet is of some type or if the
packet fits the description of a packet Set or fits any boolean combination of the four Sets. With the Action
item you can for instancte trigger the Recorder. One or more items can also easily be repeated by putting
them in a surrounding repeat box (see yellow box in example above).
In the bottom box to the right of the Trigger Sequencer, the properties of the selected item will be
displayed. In the example above it are the properties of the selected Jump item, where the jump condition
can be specified. In this example the condition is that the packet most be of type Cycle Start. And the
jump is taken if the condition has not been met.
The trigger program in the example above for instance will trigger the Recorder when a bus-reset event
has been detected, followed by 1000 cycle-start packets. More examples will be shown below where the
details of the Trigger Sequencer are described.
To activate the trigger sequencer press the Start or restart trigger sequencer button in the toolbar, or start
the Recorder (a Recorder start always will (re)start the trigger sequencer). The Trigger sequencer active
indicator in the toolbar will light as indication that the trigger sequencer is active and a red arrow will be
displayed in front of the currently executed item, to help in debugging the trigger program.
Pressing the Stop trigger sequencer button in the toolbar will stop the trigger sequencer.
In the Trigger Position box, you can choose the size of the Recorder buffer to be used maximal after a
trigger has occured, using the Max post-trigger size slider. If a trigger occurs and the specified amount of
data has been recorded after the trigger, the Recorder will automatically stop. If the Stop recording when