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Spectre Simualtion errors (premature failure)

superman321
Im trying to simulate a simple Inverter with a spectre (version 5.1 ) and I have the following error messages: input.scs: (transistor nmos) T0 is an instance of an undefined model subcircuit. and similar error on the PMOS transitor too. Although, the same circuit was working fine a few days a ago. It has stopped suddenly with the above error messages. any help will be kindly appreciated. thanks
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  • Apologies - I thought I'd given the solution to this yesterday, but I accidentally appended the wrong post.

    So here's what I wrote:

    Sorry, I just realised I didn't read your original post closely enough. I spotted you said T0 is an instance of an undefined model subcircuit. The subcircuit is what gives it away - the netlist has ended up incorrect.

    Most likely this is because you don't have the UNIX environment variable $CDS_Netlisting_Mode set before you start virtuoso. Do:

    setenv CDS_Netlisting_Mode Analog

    (if using csh), or:

    export CDS_Netlisting_Mode=Analog

    if using bash/ksh.

    Then start virtuoso. 

    I suspect that will solve it. You'll need to do a Simulation->Netlist->Recreate to force it to renetlist.

    Regards,

    Andrew.

     

Reply

  • Apologies - I thought I'd given the solution to this yesterday, but I accidentally appended the wrong post.

    So here's what I wrote:

    Sorry, I just realised I didn't read your original post closely enough. I spotted you said T0 is an instance of an undefined model subcircuit. The subcircuit is what gives it away - the netlist has ended up incorrect.

    Most likely this is because you don't have the UNIX environment variable $CDS_Netlisting_Mode set before you start virtuoso. Do:

    setenv CDS_Netlisting_Mode Analog

    (if using csh), or:

    export CDS_Netlisting_Mode=Analog

    if using bash/ksh.

    Then start virtuoso. 

    I suspect that will solve it. You'll need to do a Simulation->Netlist->Recreate to force it to renetlist.

    Regards,

    Andrew.

     

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