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deepprobe to a bussed net in AMS

paguirre78

Hi,

I'm trying to use a deepprobe instance from analogLib to probe a bused net inside one of the circuits in an AMS simulation. I found some rather old posts on this issue (deepprobe with AMS) and documentation on deepprobe when it was added to the analogLib not too long ago.

Since I couldn't make it work in my rather complex and large circuit, I set up a simple circuit to test what I was doing.

I created a test circuit with a bused net inside of it named Vint<4:0>.

Then I tried to reach Vint<2> from the test bench where the test circuit was instanced as I0.

If I do a spectre simulation, the deepprobe argument should be: I0.Vint\<2\> and it works perfectly.

In AMS simulation, buses in the netlist are noted with square brackets: 

wire [4:0] Vint;

Therefore, as this post suggest the deepprobe argument should be I0.Vint\[2\].

However, the resulting AMS netlist has this:

iprobe IPRB0 (I0.\Vint[2] , Vprobed);

which doesn't work due to the \ in front of Vint, which was added out of nowhere by the netlister. If I manually remove the \ from the netlist, it works!

It is worth noting that I tried using <> with or without \ and it doesn't work either (as expected) in AMS. I have also tried other combinations with no luck.

Am I doing something wrong? 

By the way, I'm running everything from ADE, using UNL netlister for AMS sims, and these are the tools version I'm using:

  • virtuoso IC6.1.7-64b.500.20 
  • ncsim(64) 15.20-s005
  • spectre 17.1.0.307.isr6

Thanks!

-P

Parents

  • Update:

    After working with customer support on this issue, I can confirm that this issue is solved after INCISIVE 15.20.022 (i was using 15.20.005).

    It is also worth mentioning that from this version on, the same deepprobe argument as in Spectre should be used in AMS sims: I0.Vint\<2\> 

    The resulting AMS netlist is the correct one with square brackets:

    iprobe IPRB0 (I0.Vint[2] , Vprobed);

     

    Best regards,

    -P

  • in reply to paguirre78

    Odd. It doesn't work for me! I was using a newer XCELIUM version but just tried again with 15.20-s070. I get:

    iprobe IPRB0 (\I0.mid<2> , midPoint);

    I wonder whether it is something to do with my test case using the inv cells from the sample library (not sure why). 

    Anyway, glad you got it working - if I had more time I'd dig a bit further!

    Andrew. 

Reply
  • in reply to paguirre78

    Odd. It doesn't work for me! I was using a newer XCELIUM version but just tried again with 15.20-s070. I get:

    iprobe IPRB0 (\I0.mid<2> , midPoint);

    I wonder whether it is something to do with my test case using the inv cells from the sample library (not sure why). 

    Anyway, glad you got it working - if I had more time I'd dig a bit further!

    Andrew. 

Children
  • in reply to Andrew Beckett

    Hi Andrew,

    That's odd indeed. Customer support (case 46349376) reported that it worked for them using IC6.1.7 ISR20 (as mine) and INCISIVE 15.20.071. They then tried different INCISIVE versions and apparently it worked for them from 15.20.022 and up.

    In my case, it worked with IC6.1.7 ISR20 and INCISIVE 15.20.026.

    I hope it helps!

    Best,

    -P

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