![]() GDSII files are usually the final output product of the IC design cycle and are handed over to IC foundries for IC fabrication. It was originally developed by Calma for its layout design system, "Graphic Design System" ("GDS") and "GDSII". Despite its limited set of features and low data density, it became the industry conventional stream format for transfer of IC layout data between design tools of different vendors, all of which operated with proprietary data formats. Initially, GDSII was designed as a stream format used to control integrated circuit photomask plotting. The data can be used to reconstruct all or part of the artwork to be used in sharing layouts, transferring artwork between different tools, or creating photomasks. ![]() It is a binary file format representing planar geometric shapes, text labels, and other information about the layout in hierarchical form. GDSII stream format ( GDSII), is a binary database file format which is the de facto industry standard for Electronic Design Automation data exchange of integrated circuit or IC layout artwork. The reddish structures are polysilicon gates, and the solid at the bottom is the crystalline silicon bulk. The sand-colored structures are metal interconnect, with the vertical pillars being contacts, typically plugs of tungsten. A rendering of a small GDSII standard cell with three metal layers ( dielectric has been removed).
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