Using the create_generated_clock Constraint

The Interface Designer does not create SDC constraints for generated clocks. Typically, you implement the generated clock in the core design by dividing down interface clocks. You need to add constraints for these clocks.

Figure 1. Divide Down Clock

SDC Commands:

create_clock -period 10 -name clk0 [get_ports clkin]
create_generated_clock -source [get_ports clkin] -divide_by 2 [ get_pins divclk|Q ] -name gen_clk0