The Vivado Design Suite uses design constraints to define requirements for both the physical and timing characteristics of the design.
For more information, see Guiding Implementation with Design Constraints.
read_xdc command reads an XDC
constraint file, then applies it to the in-memory design.
Tip: Although Project Mode supports the definition of constraint sets, containing multiple constraint files for different purposes, Non-Project Mode uses multiple
read_xdccommands to achieve the same effect.