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Bus Doctor Analyzer Capture
Bus Doctor's Capture Engine provides the following features:
Transitional Timestamping
This capture method stores only the changes or events, and doesn't store
unchanging signal patterns. The transitional capture is used by both state
and timing modes and ensures the maximum amount of usable data is stored.
Bandwidth
The capture engine is capable of storing 4.5 Gigabytes per second (144
bits wide including timestamp @ 250MHz on the 108 channel version). It
can maintain this rate across the entire 4 Gigabytes of memory, which
means no filtering or pauses in bus activity are required when capturing
a very large, fast trace.
Depth
The buffer can be up to 4 Gigabytes deep (256 Million Events x 144 bits
per event on 108 channel version).
Segmentable Trace Buffer
The large trace buffer can also be divided into smaller buffers, allowing
the user to choose between using the large memory for a single trace,
or to hold tens-to-hundreds of smaller traces. Advantages of this architecture
serve a variety of purposes:
Ability to quickly move back and forth between traces without reloading
them in to memory from the hard drive.
Ability to automatically re-arm and run in the next consecutive segment
after the analyzer stops due to triggering in the current segment. With
this feature, the user can setup a trigger condition, such as a type or
error, and then fill each segment with pre-trigger data for each occurrence
of the error. The analyzer could then run over the weekend, providing
the user with the pre-trigger data for every instance of the trigger condition.
Since 1997, Gillaspy Associates has built
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