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

[amildm]

Hi All,

In SignalTap there is an option to define the Data Depth to '0'... When is this option useful?

Thank you!

[Vic3Dexe]

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.

[amildm]

[Vic3Dexe]

Yes, I get it.

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

[amildm]

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

[Vic3Dexe]

As I thought.

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

[ShengN_Intel · Accepted solution]

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]

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?

[sstrell]

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.

[amildm]

The question was to @ShengN_Intel - he is an insider.... So in my guess he could provide a mature answer

[sstrell]

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