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diff --git a/cad/magic/DESCR b/cad/magic/DESCR new file mode 100644 index 00000000000..bcb85af03d9 --- /dev/null +++ b/cad/magic/DESCR @@ -0,0 +1,24 @@ +Magic is an interactive system for creating and modifying VLSI circuit +layouts. With Magic, you use a color graphics display and a mouse or +graphics tablet to design basic cells and to combine them +hierarchically into large structures. Magic is different from other +layout editors you may have used. The most important difference is +that Magic is more than just a color painting tool: it understands +quite a bit about the nature of circuits and uses this information to +provide you with additional operations. For example, Magic has +built-in knowledge of layout rules; as you are editing, it +continuously checks for rule violations. Magic also knows about +connectivity and transistors, and contains a built-in hierarchical +circuit extractor. Magic also has a plow operation that +you can use to stretch or compact cells. Lastly, Magic has routing +tools that you can use to make the global interconnections in your +circuits. + +Magic is based on the Mead-Conway style of design. This means that it +uses simplified design rules and circuit structures. The +simplifications make it easier for you to design circuits and permit +Magic to provide powerful assistance that would not be possible +otherwise. However, they result in slightly less dense circuits than +you could get with more complex rules and structures. For example, +Magic permits only Manhattan designs (those whose edges are vertical +or horizontal). |