About Constraints Methodology - 2023.2 English

Vivado Design Suite User Guide: Using Constraints (UG903)

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2023.2 English

Design constraints define the requirements that must be met by the compilation flow in order for the design to be functional on the board. Not all constraints are used by all steps in the compilation flow. For example, physical constraints are used only during the implementation steps (that is, by the placer and the router).

Because the AMD Vivado™ Integrated Design Environment (IDE) synthesis and implementation algorithms are timing-driven, you must create proper timing constraints. Over-constraining or under-constraining your design makes timing closure difficult. You must use reasonable constraints that correspond to your application requirements.