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VPI (Read 7575 times)

rajdeep Senior Member Offline Posts: 220 UK	VPI Jul 09^th, 2006, 8:59am Hello everybody, Can i call a C/C++ program while simulating a verilog-AMS model in cadence tool using ncsim? The idea is to pass some of the signal values, obtained from simulation to an external C program. The passng should be on the fly, i.e. the signal values should be continuously passed to the external program. Rajdeep
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A_Programmer Junior Member Offline Posts: 13	Re: VPI Reply #1 - Jul 9^th, 2006, 11:23pm What is the advantage of doing this? Gain in simulation speed?
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rajdeep Senior Member Offline Posts: 220 UK	Re: VPI Reply #2 - Jul 10^th, 2006, 2:46am No, i've to do some calculations with the simulated signal values.. This cannot be done online using ncsim. So, i need to take this data out and feed it to an external program!! But i.m still not sure, whether it is possible or not?
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rajdeep Senior Member Offline Posts: 220 UK	Re: VPI Reply #3 - Jul 16^th, 2006, 7:55am Hi all, it will be nice to get an answer yes or no to this problem. This will help me greatly. Thanks, Rajdeep
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Geoffrey_Coram Senior Fellow Offline Posts: 1998 Massachusetts, USA	Re: VPI Reply #4 - Jul 17^th, 2006, 4:44am I guess no one on this forum has tried that. Have you looked in the documentation or contacted your AE? I wouldn't have said that ncsim can do Verilog-AMS; I thought Cadence's AMS product was AMS Designer. I've personally never used VPI.
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rajdeep Senior Member Offline Posts: 220 UK	Re: VPI Reply #5 - Jul 18^th, 2006, 12:58am Thnaks a lot for the reply. It need not to be ncsim. I want a cadence verilog-AMS simulator to have this feature VPI. According to the manual it has this feature, but with this can I call an external program written in C/C++ ??
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Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: VPI Reply #6 - Jul 24^th, 2006, 2:09pm AMS Designer is run using ncsim (with some special options). And yes it does support VPI. And yes you could interface to a C/C++ program. Or you could use SystemC? Andrew.
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rajdeep Senior Member Offline Posts: 220 UK	Re: VPI Reply #7 - Jul 25^th, 2006, 3:10am Thank you very much!! I was going through the VPI chapters of the Verilog-AMS LRM. It isn't very easy to go through in one go...but thanx again for the reply
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rajdeep Senior Member Offline Posts: 220 UK	Re: VPI Reply #8 - Jul 25^th, 2006, 3:25am Can anybody help me to find a tutorial sort of thing on VPI? Or, may be a pice of code/command liens that shows how to call an external C program!! Thanks!
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Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: VPI Reply #9 - Jul 26^th, 2006, 1:53pm Raideep, I don't have any VPI code for AMS handy, but I do have a very simple example that I wrote 8 years ago (an inverter) modeled in C - just to show the principle. Because the code was a little too long to paste here directly, I converted it to pdf, and am attaching that. Regards, Andrew.
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rajdeep

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Re: VPI
Reply #10 - Jul 27^th, 2006, 2:46pm

Thanks a lot Andrew!! The code looks very complicated with lots of inbuilt functions and datatypes. But this surely will give me a working example, and help me to understand how the different functions are used to make the callbacks.

I'll probably ask more and better questions once I understand this VPI stuff a little better.

Thanks a again. You have been a life saviour :D

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