DAP Technology 1394, Operation Manual

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Recorder
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which can be used to save a selection of packets as a text file or as Packet file. A Packet file can be used
in the (isochronous) Generator.
7.1.1.2. Record Packets
If the internal recorder memory of the Analyzer is empty, you can start recording by selecting the 'Start'
command from the 'Recorder' menu, or clicking the 'Start Recording' button in the toolbar.
When the internal recorder memory is not empty, you can clear it with the 'Clear' command in the
'Recorder' menu or by clicking the 'Clear FireSpy recorder memory' button in the toolbar.
The 'Recorded bytes' box in the toolbar will display the number of recorded bytes, and the 'Record
progress bar' in the toolbar will indicate the part of recorder memory that is filled with data.
Note that when the Recorder is not triggered yet, only the part before the trigger indicator in the progress
bar (the little vertical line) will be filled. If this part becomes full, recording continues and old data will be
removed from the memory while the new data is stored (cyclic buffer). After the Recorder is triggered, the
data will be stored after the trigger position until the recorder memory is full.
If recorder memory becomes full, the recording is automatically stopped. You can also stop the recording
manually by selecting the 'Stop' command in the 'Recorder' menu, or clicking the 'Stop Recording' button
in the toolbar.
The hardware-Filter logic inside the Analyzer can be used to selectively store packets. See Filter/Trigger
for more details.
Third Generation Analyzers:
For third generation analyzers the Recorder works differently. When the Recorder is started as described
above it will start filling a buffer in on-board memory and at the same time the host will start reading data
from this on-board buffer as fast as possible. Data is written to a temporary file on the host pc. This results
in the possibility to make recordings of up-to 10GByte data. However, please keep in mind that if the host
pc can not keep up the Recorder will simply stop when the FireSpy on-board buffer is full. Therefore, it is
important to use a fast hard drive or SSD to hold the temporary Recording file. This can be configured
through the settings dialog:
Recording Settings .
7.1.1.3. Download recorded packets
When the recording has been stopped, you can download the recorded packets by selecting the
'Download' command in the 'Recorder' menu or clicking the 'Download recorded data from Analyzer'
button in the toolbar.
After the download, the data can be viewed using the different kind of views.
Note that initially, only basic packet information is downloaded from the Analyzer. As soon as more
detailed information is needed (e.g. to display the data quadlets of the packet), this information is read
from the Analyzer. Thus you cannot clear the recorder memory as long as you want to view the recorded
data.
You can however save the recorded data to file using the 'Save As' command in the 'File' menu and open
this file using the 'Open' command in the 'File' menu. By doing so, the data in the recorder memory is not
needed anymore and can be cleared.
7.1.1.4. Triggering
The Recorder can be triggered in different ways:
· You can press the trigger button on the Analyzer device.
·
You can apply a trigger pulse on the external trigger input on the Analyzer device.
·
You can click the 'Trigger' button in the toolbar or invoke the 'Trigger' command in the 'Recorder' menu.
· You can instruct the hardware-trigger logic to generate a trigger when a sequence of specified
conditions are met.