The authoritative document that defines every layout rule for a technology, layer by layer, with values, definitions, figures and notes, which designers, verification decks and libraries must follow.
Specification Work product in the Process technology (node) lifecycle and the Process design kit (PDK) development lifecycle
It is the single reference for what layouts the process can build reliably. Verification decks, libraries and customer layouts that follow different readings of the rules let designs pass checks that do not reflect what the fab can make. In the PDK lifecycle it is a kit deliverable updated at each release; in the process node lifecycle it is the technology's rule baseline.
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