1) Derating is simply another way of adding margin to the design. This allows you to scale all delays by a certain percentage to increase margin. This is not an SDC constraint, but a variable to set within the tool run script.
2) OCV is a timing mode ( like a single or BC/WC). This allows you to use variation from the libraries in performing timing checks for ensuring worst case scenarios.
up to wat rate the derating values must be added to the delays of the standarad cells.
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