[SI-LIST] Re: Error in HSPICE
- From: Bob Patel <whizplayer@xxxxxxxxx>
- To: plaflamm@xxxxxxxx, Andrew.Ingraham@xxxxxx
- Date: Tue, 3 Dec 2002 17:06:57 -0800 (PST)
Hi! In my case the process models are completely
encrypted i.e. there are no subckt statements defined.
Hence, when I use this process file I always get the
'redefine' problem with nch & pch.
I am asking the vendor for help on this but for now I
have tried different ways but no avail.
Thanks
Bob
--- Peter LaFlamme <plaflamm@xxxxxxxx> wrote:
>
> I have run into this many times. The reason is that
> your receiver and your driver both contain the NCH
> transistor .model information. As Andy said,
> encapsulating the process/transistor models within
> each subcircuit will solve this problem.
>
> Other ideas:
>
> If you have access to the process models you can
> create a .lib file.
>
> If the model is completely encrypted (except for the
> .subckt statement) you can encapsulate the entire
> model by creating a new subcircuit around it. Thus:
>
>
********************************************************************
> .Subckt new node1 node2 node3 ....
>
> x1 node1 node2 node3 ... encryptedsub
>
> .subckt encryptedsub node1 node2 node3 ...
> ** the full encrypted file that you have should be
> here***
>
> .ends new
>
>
*******************************************************************
>
> I hope this helps...
>
> Peter
>
>
> "Ingraham, Andrew" wrote:
> >
> > > Hi! In my spice deck I had calls for two
> encrypted
> > > driver & receiver. When I run the sim, it gives
> me
> > > error: 'above line attempts to redefine nch' and
> > > similar error for pch. I know this could be due
> to the
> > > same nodes being called in the encrypted models.
> >
> > It is probably not the same nodes. SPICE wouldn't
> have a problem with
> > that. It is probably duplicate transistor model
> definitions:
> >
> > .MODEL NCH NMOS ...
> >
> > ... and later, another one:
> >
> > .MODEL NCH NMOS ...
> >
> > > What is the workaround for this?
> >
> > Unless one of the .model definitions is your own
> (outside the encrypted
> > portions), contact whoever is responsible for the
> encrypted models and
> > ask them to change one or both model names to
> something less generic.
> > Or be more blunt and remind them they made a big
> mistake by creating two
> > encrypted models that both define the same
> transistor models (rather
> > than putting the .MODEL definitions into a third
> encrypted file that
> > gets loaded as needed by the driver and receiver
> models).
> >
> > Or do what Craig Clewell suggested and see if you
> can split your
> > simulation into two parts that run separately.
> Since many simulations
> > depend on the nonlinear interaction between driver
> and receiver, this
> > might be less than satisfactory.
> >
> > (I forget whether encapsulating the encrypted
> models into subcircuits is
> > another way to avoid this problem, by limiting the
> "scope" of each model
> > definition. I think it doesn't, in the case of
> .MODEL statements.)
> >
> > Regards,
> > Andy
> >
> >
>
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