DAP Technology 1394, Руководство по эксплуатации

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Filter/Trigger
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buffer full option is selected (default), the Recorder will also stop when the complete Recorder buffer has
been filled with data. In this mode you will never overwrite recorded data.
When you however select the Cyclic pre-trigger buffer option, the Recorder will use a cyclic buffer for the
recorded data before a trigger occurs. When this cyclic buffer gets full, the oldest data will be overwritten
with the new recorded data. Until a trigger occurs. Then the cyclic buffer will not be overwritten by new
data. The new data will be stored in the remaining part of the Recorder buffer until the buffer is completely
full or until the Max post-trigger size condition has been met as descibed above. If the cyclic option has
been selected, the size of the cyclic buffer can be defined using the Max pre-trigger size slider.
Inside the Trigger Always on: box you can specify some conditions on which the Recorder should always
trigger (thus independent of the Trigger Sequencer). You can specify to trigger on some type of errors and
you can specify to trigger if a packed is detected that fits a packet Set or fits any boolean combination of
the four packet Sets. In the example above for instance, the Recorder will always be triggered when a
packet is detected with a Header error or when a packet is detected that fits the description of packet
SetA, but not that of SetB or SetC. Note that a red cross will be displayed before the boolean expression
when there is an error in the expression.
After defining the complete filter/trigger information, you can upload the settings to the Analyzer by
pressing the Apply button at the bottom of the window.
If you used one of the four basic sets you should define which packets fits the set. See Packet Sets below.
12.1.2. General Trigger
Cyclic buffer mode is not available on
·
Third Generation Analyzers
An example of the General Trigger page is shown below.