Circuit designs continue to get larger and more complicated. Custom layout, like most steps in the IC design flow, has become more tedious and time consuming. Designers are always looking for better tools to automate the process and help them become more productive. Schematic-driven layout (SDL) is a design methodology that assists designers with the physical implementation of circuits, by providing automation and continuity between logic and layout. SDL relies on device generation technology for automation of the creation of physical layout from schematic elements.Introduction
SDL Evolution
In the early years of semiconductor development, IC designs were hand-drawn on mylar graph paper and transferred to photomasks in a combination of hand-made stencils and photgraphic processing. This was possible because desiigns were small and relatively simple. As designs became more complex and computer performance improved, Computer-Aided Design (CAD) systems with polygon layout editors became necessary for creating and capturing designs.
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