When renaming auto-derived clocks, a single "create_generated_clock" constraint has to specify one and only one auto-derived clock to rename.
A user-defined generated clock cannot be renamed.
create_generated_clock -name new_name [-source source_pin] [-master_clock master_clk] source_object
This Critical Warning indicates that no auto-derived clock is found in the design that meets the criteria specified in the "create_generated_clock" constraint.
The following are possible causes of this Critical Warning:
- A user-defined generated clock is created on the pin specified in the "source_object" argument.
- No master clock has been created for this generated clock.
- Incorrect value specified for the -source, -master_clock or source_object argument.
Use the report_clocks command to check for the correct value(s).