The record of the process the macro is built on: the process option, the metal stack, the device types and threshold flavours allowed, the supply voltages and the foundry kit version the design will use.
Specification Work product in the Hard IP lifecycle
The layout, the sign-off checks and the views all depend on the process and the metal stack, and changing either late means redoing most of the work. Fixing them early, with the foundry, lets the design, the integrators and the test chip plan proceed on the same basis.
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