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
clkip
/mmcm0
. The name of the auto-generated
clock is cpuClk
and its definition point is
clkip
/mmcm0
/CLKOUT
.
Figure 1. Auto Generated Clock Example

Tip: Use the
get_clocks
-of_objects <pin/port/net>
command to query an auto-generated
clock without knowing its name. This makes your constraint or script independent of
the clock name changes.