Required Constraints - 6.0 English

Clocking Wizard LogiCORE IP Product Guide (PG065)

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6.0 English

At least one clock constraint is required for period and jitter. The following command signifies the setting of +/- 100 ps (= 0.1 nsec) peak to peak jitter on the primary clock port propagating through input port clk_in1.

create_clock -period 10.0 [get_ports clk_in1]

set_input_jitter [get_clocks -of_objects [get_ports clk_in1]] 0.1

The core-level XDC has early processing order, meaning that core-level XDC constraints are applied first and are then overridden by the user-provided constraints.