Read XDC commands sequentially. For equivalent constraints, the last one takes precedence.
Constraints order Example:
create_clock -name clk1 -period 10 [get_ports clk_in1]
create_clock -name clk2 -period 11 [get_ports clk_in1]In this example, the second clock definition overrides the first because:
- Both target the same input port.
-
You did not use the
create_clock -addoption.