Example - 2025.1 English - UG906

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)
Document ID
UG906
Release Date
2025-05-29
Version
2025.1 English

In the following figure, the primary clock was correctly defined on the top-level port clk_pin_p. However, a create_clock constraint was used to redefine the primary clock on the output of the IBUFCTRL output. This new clock will ignore all delays prior to the IBUFCTRL.

Figure 1. Invalid Primary Clock Redefinition on a Clock Tree
Page-1 Sheet.1 Process Previous primary clock defined on the clock tree Previous primary clock defined on the clock tree Sheet.3 Process.5 Primary clock defined on the clock tree Primary clock defined on the clock tree Sheet.5 Sheet.7 X15525-111715 X15525-111715