The following automatically derived clock example is a clock generated by an MMCM.
The master clock
clkin drives the input CLKIN of the MMCME2 instance
mmcm0. The name of the auto-generated
cpuClk and its definition point is
get_clocks -of_objects <pin/port/net>command to query an auto-generated clock without knowing its name. This will make your constraint or script independent of the clock name changes.