When applying constraints to the design, the commands
source differ in behavior.
The constraints applied through the command
always saved inside the checkpoint after the constraints applied through the command
read_xdc. To preserve the XDC constraints inside the
checkpoint in the same order that they are applied to the design, use
read_xdc -unmanaged instead of
For more information, see the Vivado Design Suite User Guide: Using Constraints (UG903).