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Amir3's avatar
Amir3
Icon for Occasional Contributor rankOccasional Contributor
4 years ago
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Signal Tap - What the difference between 'Data Enable' to 'Storage Enable'

Hi,

What the difference between 'Data Enable' to 'Storage Enable' in Signal Tap?

note that I am running the Signal Tap according to the 'Conditional' configuration and I have set a Trigger. In my configuration both 'Data' and 'Storage' are marked in Checkbox's.

If I do not mark the 'Data' checkbox ('Storage' is still marked), will the information be recorded?

Thanks.

  • sstrell's avatar
    sstrell
    4 years ago

    Data Enable means that when the trigger occurs, signal data for that tapped node will be stored in the buffer. Storage Enable means that that signal will be used as part of the condition for qualifying what data samples will be stored in the buffer. If Storage Enable is enabled and Data Enable is *not* enabled, that signal will *not* show up in the captured data.

3 Replies

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

    Data Enable means that when the trigger occurs, signal data for that tapped node will be stored in the buffer. Storage Enable means that that signal will be used as part of the condition for qualifying what data samples will be stored in the buffer. If Storage Enable is enabled and Data Enable is *not* enabled, that signal will *not* show up in the captured data.

    • Amir3's avatar
      Amir3
      Icon for Occasional Contributor rankOccasional Contributor
      4 years ago

      thanks for your explanation.

      In order to understand unequivocally - is there any situation where I will enable the 'Storage Enable' and disable the 'Data Enable'?

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

        Sure. If your storage qualification condition is very simple, for example when a particular signal is high, there's no need to capture that signal as data (since you know it will just show as high in all captured samples), saving you buffer space for other signals.