Example Six: Forwarded Clock Driven by ODDR - Example Six: Forwarded Clock Driven by ODDR - 2026.1 English

Example Six: Forwarded Clock Driven by ODDR - Example Six: Forwarded Clock Driven by ODDR - 2026.1 English - UG903

Vivado Design Suite User Guide: Using Constraints (UG903)

Document ID

UG903

Release Date

2026-07-01

Version

2026.1 English

Create a forwarded clock on the output port driven by an ODDR. Reference the master clock on ODDRE1_vsfclk2_inst/CLKDIV, and keep the same period using -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