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On Mon, 24 Dec 2001, Nenad Novovic wrote:

> I need to transfer layout in Magic to Spice. Is that possible and if
> it is, how can it be done?

You use the extract command in Magic.

Typically a magic design will be hierarchical, with a .mag file describing
each level in the hierarchical design.  If you go to the top cell that you
want to simulate and issue the :extract command, Magic will descend the
design and generate a .ext file from each .mag file.  The .ext files are a
hierarchical electrical description of the design, including transistor
connections and geometry, lumped capacitance to ground at each node and
various cross-capacitances.

Once you have the .ext files run the external command ext2spice on the top
level .ext file.  This will generate a flattened netlist suitable for
SPICE simulation.

To correctly extract the design, Magic needs an accurate technology file
for the design.  This describes various area and perimeter capacitance
parameters between layers in the fabrication process and parameters
describing how the transistors need to be extracted.  MOSIS provides
technology files for the foundries they use.  If you're using another fab
house you might need to build the technlogy file yourself.  One of the
problems is that various foundries consider their process parameters
proprietary, so even if someone has built a technology file for their
foundry they won't be able to release it into the public domain.

If you work through the Magic tutorial documents, tutorial #8 covers
design extraction.

Hope this helps.

-Rob Penny (rob AT ucsd DOT edu)

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