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

amildm
Valued Contributor I
1,116 Views

Hi All,

 

In SignalTap there is an option to define the Data Depth to '0'... When is this option useful?
 
Thank you!
 
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1 Solution
ShengN_Intel
Employee
1,065 Views

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.


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10 Replies
Vic3Dexe
New Contributor I
1,108 Views

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.

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amildm
Valued Contributor I
1,101 Views
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Vic3Dexe
New Contributor I
1,096 Views

Yes, I get it.

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

Vic3Dexe_2-1655679390763.png

 

 

 

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amildm
Valued Contributor I
1,095 Views

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

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Vic3Dexe
New Contributor I
1,086 Views

As I thought.

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

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ShengN_Intel
Employee
1,066 Views

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
Valued Contributor I
1,023 Views

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?

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sstrell
Honored Contributor III
1,017 Views

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.

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amildm
Valued Contributor I
1,004 Views
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sstrell
Honored Contributor III
989 Views

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

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