Re: gEDA-user: Getting symbols from ASIC libraries into gschem: one approach

[Jeff Trull <jetrull@xxxxxxxxxxxxx>]

I think the scripts are the property of my employer, unfortunately.  I think 
it's OK for me to tell people how I did it, though!

On Tuesday 12 June 2007 15:05:50 Carlos Nieves Ónega wrote:
> Hi Jeff,
>
> El lun, 11-06-2007 a las 21:55 -0700, Jeff Trull escribió:
> > Hi all,
> >
> > I'm consulting for a small ASIC startup that is interested in gEDA.  They
> > have a handful of licenses for expensive commercial tools but were
> > looking for a low-overhead way to do some semi-custom work and asked me
> > to investigate.  I just went through the process of figuring out how to
> > make symbols for the third-party standard cell libraries they've
> > licensed, and I thought I'd share my experiences since I couldn't find
> > this described on the net anywhere.
> >
> > Among the provided views of this library are ones for Cadence's Composer
> > product.  It turns out Cadence supplies a tool called "edifout", which
> > will produce an EDIF (text) version of any cell view.  You need to supply
> > a template file, which Cadence helpfully provides an example of
> > (tools/dfII/samples/xlUI/edifOut.il).  I wrote a Perl script that just
> > runs this once for every cell in the library, although some people
> > recommend building a huge schematic with every cell in it, and then
> > running edifout just once.  With my approach you do need to generate a
> > new template file each time, specifying a different cell (and you want
> > the "symbol" view).
> >
> > Now you have EDIF for each cell's symbol view.  From here I tried to find
> > some kind of public-domain parser, but everything was a dead end.  Then I
> > realized that EDIF looked kind of like Lisp - i.e., an "s-expression". 
> > It turns out there's a CPAN module for parsing s-expressions called
> > Data::SExpression, so I could suck in the whole file and treat it as a
> > data structure (lists of lists).  I did have to do a few day's worth of
> > coding on top of this to generate the gschem symbols - the EDIF can be
> > complex and the vendor libraries are quirky.
>
> This could be a path other people may be interested in. If you are
> willing to share the scripts, they may be incorporated into gaf utils
> package. Of course, if there is no licensing/patent conflicts...
>
> Regards,
>
> Carlos
>
>
>
>
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