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amildm's avatar
amildm
Icon for Contributor rankContributor
3 years ago
Solved

SignalTap -> Data Depth set to 0 -> when useful?

Hi All,

In SignalTap there is an option to define the Data Depth to '0'... When is this option useful?
Thank you!
  • ShengN_altera's avatar
    ShengN_altera
    3 years ago

    Hi,


    When sample depth 0 is selected, no ram is needed. In that case, STP becomes a simple logical condition test tool. The waveform viewer still tells you whether condition is met or not, instead of drawing waveforms.


    Best Regards,

    Sheng


    p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution and give Kudos.


10 Replies

  • ShengN_altera's avatar
    ShengN_altera
    Icon for Super Contributor rankSuper Contributor
    3 years ago

    Hi,


    When sample depth 0 is selected, no ram is needed. In that case, STP becomes a simple logical condition test tool. The waveform viewer still tells you whether condition is met or not, instead of drawing waveforms.


    Best Regards,

    Sheng


    p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution and give Kudos.


    • amildm's avatar
      amildm
      Icon for Contributor rankContributor
      3 years ago

      OK, so a waveform will not be drawing .... So, how to know that the condition has been met? Should I see some message in the Data Tab instead of waves?

  • Vic3Dexe's avatar
    Vic3Dexe
    Icon for Occasional Contributor rankOccasional Contributor
    3 years ago

    Sample depth? Hmm.. Never paid attention.

    Now I'm curios too )

    What exactly signaltap shows when sample depth = 0? I can't check it right now myself.

  • Vic3Dexe's avatar
    Vic3Dexe
    Icon for Occasional Contributor rankOccasional Contributor
    3 years ago

    Yes, I get it.

    I'm asking what is the actual picture when you press "run analysis"?

    • amildm's avatar
      amildm
      Icon for Contributor rankContributor
      3 years ago

      With Data Depth of 0 it seems nothing is captured.... So the question was when the Data Depth is actually useful (if ever)?

  • Vic3Dexe's avatar
    Vic3Dexe
    Icon for Occasional Contributor rankOccasional Contributor
    3 years ago

    As I thought.

    IMO this option is useless (0 samples = no data). Just another bug in quartus.

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    3 years ago

    I've never used it, but I presume the logic analyzer would still trigger and stop running. You just wouldn't see any data on the Data tab.

    • sstrell's avatar
      sstrell
      Icon for Super Contributor rankSuper Contributor
      3 years ago

      Not sure what you mean. It seems like this is how it would work based on what Sheng says.