In this example, a forwarded clock is created on the output port driven by an ODDR
cell. The forwarded clock references the master clock driving the ODDR/CLKDIV pin
and has the same period as the master clock (-divide_by 1):
create_generated_clock -name ck_vsf_clk_2 \
-source [get_pins ODDRE1_vsfclk2_inst/CLKDIV] -divide_by 1 [get_ports vsf_clk_2]
Figure 1. Example of Forwarded Clock
