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1.
Select the
Wired
tab.
2.
Check the
Logic Transitions and Inputs
box.
3.
Select
Add Input to Display in Instant Timing
(repeat for additional inputs).
4.
Use pin assignments shown in
Recording Options
, or select custom pin assignments. Assign
custom names to inputs as desired.
5.
Attach the Flying Leads Cable between the IO Probe connector on the analyzer’s back-panel
and the logic signal(s) to be monitored. See Appendix A – Flying Leads Cable for details.
6.
Click on
Record
on the toolbar.
The analyzer will capture up to 12 logic lines and will compress the logic
transitions with a very efficient engine, but the throughput of the compressed
data will be directly related to the frequency of the lines. The more lines that
are toggling fast, the higher the throughput requirement, and at some point
the internal buffer allocated to the logic stream will get full and the capture will
stop for that stream (the other streams are independent and will continue).
There are a few ways to improve the efficiency of the logic capture:
1.
Use a latest generation processor with a fast SSD and make sure that
the PC is not busy doing other tasks during the capture.
2.
Make sure that the faster lines are connected on the lower indexes.
For example the fastest transitioning line should be connected to input
0, the second fastest to input 1, etc.
3.
If signals with high “glitch” rates (such as noisy signals) are received
on the logic capture, this will increase the required throughput. These
glitches can be avoided or reduced with better grounding and increased
space between the wires. If glitches are seen on unused inputs, it is
recommended to connect these inputs to ground.
Capturing Traffic
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