Whether you use one or more XDC files for your design, AMD recommends that you organize your constraints in the following sequence:
## Timing Assertions Section
# Primary clocks
# Virtual clocks
# Generated clocks
# Clock Groups
# Input and output delay constraints
## Timing Exceptions Section (sorted by precedence)
# False Paths
# Max Delay / Min Delay
# Multicycle Paths
# Case Analysis
# Disable Timing
## Physical Constraints Section
# located anywhere in the file, preferably before or after the timing constraints
# or stored in a separate XDC file