Introduction

For a variety of reasons, designers would like to take a large GDSII stream file, and identify and extract all of the metal associated with a particular net or group of nets. Members of the net should be generated by detecting touching or overlapping metal, poly and vias to build connectivity. GDSII files routinely have multiple layers of metal; metal layers are interconnected vertically by vias; small rectangular "openings" in the insulation between the metal layers. Poly layers are also considered to be conductors and these can be treated in a similar fashion to metal layers.

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Artwork's NETEX program uses boolean geometry to collect connected polygons and paths into an "electrically" connected set. In addition to the actual GDSII file, NETEX requires a technology file that defines the "stackup" i.e. the conductor and via order.



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