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In electronic design automation, a design rule is a geometric constraint imposed on circuit board, semiconductor device, and integrated circuit designers to ensure their designs function properly, reliably, and can be produced with acceptable yield. Design rules for production are developed by process engineers based on the capability of their processes to realize design intent. Electronic design automation is used extensively to ensure that designers do not violate design rules; a process called design rule checking. DRC is a major step during physical verification signoff on the design, which also involves LVS checks, XOR checks, ERC , and antenna checks. The importance of design rules and DRC is greatest for ICs, which have micro- or nano-scale geometries; for advanced processes, some fabs also insist upon the use of more restricted rules to improve yield.
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