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SparkyNZ's avatar
SparkyNZ
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5 years ago

Can SignalTap ignore periods of inactivity?

Hi. I have some UART code that sends text. My top level module sends a sequence of (English) words to the UART. The UART runs at 9600 Baud which is really slow compared to the FPGA's 50MHz clock. W...
sstrell's avatar
sstrell
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5 years ago

Yes. Use one of the Storage Qualifier options to choose what samples you want to store in the buffer. You have it enabled in your screenshot using the Conditional option. Set values in the Storage Qualifier column and when the conditions are true, a sample gets stored. You could use the Transitional qualifier to store samples only when particular signal(s) change state. This sounds like what you want.

You already have the "Record data discontinuities" option enabled. This will show you in the output data where samples were skipped and not stored because of your qualifier.

This training goes into detail on storage qualification:

https://www.intel.com/content/www/us/en/programmable/support/training/course/odsw1171.html

  • SparkyNZ's avatar
    SparkyNZ
    Icon for Contributor rankContributor
    5 years ago

    Thanks for the info. Transitional definitely sounds the way to go. I'll be sure to give that a try next time. I did manage to use the Storage Qualifiers some weeks ago but I tend to find when I go back to SignalTap after a period of time, I can never get things working again. Blame that on my notes I guess.