Ordering Your Constraints - Ordering Your Constraints - 2026.1 English - UG903

Vivado Design Suite User Guide: Using Constraints (UG903)

Document ID
UG903
Release Date
2026-07-01
Version
2026.1 English
Because XDC constraints apply sequentially and follow clear precedence rules, review the order of your constraints carefully. For more information, refer to XDC Precedence.
Note: When physical constraints conflict, the latest one takes precedence. For example, if an I/O port has multiple LOCs, the most recent applies.

Follow these steps to validate your constraints step-by-step in the Vivado IDE:

  1. Run the appropriate report commands.
  2. Review the messages in the Tcl Console or the Messages window.