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tagger · Guest

All,

The below was from a previous post,
I would like info on how to create the dummy device ?

Regards
Herman

Create a dummy two-terminal device like a capacitor using an enclosing
prBoundary shape as the recognition shape.

area1=measureParameter( area (boundary_layer over dens_layer))
area2=measureParameter( area boundary_layer )
ratio=calculateParameter( area1 / area2 )
saveParameter( ratio "density )
saveRecognition( boundary_layer "prBoundary" )

Gerry Vandevalk · Guest

I think you need 3 layers ....

<ramble mode on >

The device recognition layer must be different from both conductors

(even if it is identical ... )
I find myself generating a copy of every conductor in my design to do this
kind of measurement.

( mostly for custom voltage/area/perimeter/density based antenna rules
about 15 years ago when we called
them "process induced charging failures" and I asked for the capability
.... )

I think it is a stupid limitation that a recognition layer can not be a
conductor, but the answer I got from R&D
many years ago is "no one else does this, why do you want to? It is hard to
code so go away ... "

Since I discovered the trick of self-OR-ing the conductor twice
poly_rec = geomOr( "poly" )
poly = geomOr( "poly" )
and only using poly in the connect statements and poly_rec in the device
recognition statements

(repeated for each conductor that you want to make also into a device. Note
that this defeats how PRE works since the entire layer is covered by a
"device interface" )

conductor ( don't use self and! ) I went away, but still think it is a
silly solution.

( many esoteric comments here are my recollections of the poor documentation
on how conductors (and pins and nets) fail in degenerate cases
that I seem to generate. )

<ramble mode off >
And all of my comments are very dated. This stuff may all work now, ( I
doubt it ! )

-- Gerry

This was a hot topic for a while until I sat down with several cadence
people who explained how nets and pins and netnames
worked inside the database ( EdK & JimH & JohnR & ... )

You only need two layers on a 1 terminal device ( that is what I do on my
"substrate" device, because I netlist out the
global net "gnd!" another terminal but only extract 1 terminal ....

"tagger" <tagger@swbell.net> wrote in message
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