System jitter is the overall jitter from power-supply noise, board noise, or any extra
system jitter. Use set_system_jitter to set a single value for the
entire design.
The following command sets ±100 ps input jitter on the primary clock propagating through
input port clkin:
set_input_jitter [get_clocks -of_objects [get_ports clkin]] 0.1Note: The timing engine does not use a
single equation for clock uncertainty. It computes uncertainty per path based on the
clocking topology, the clock pair, the presence of an MMCM/PLL on the tree, and other
factors. The Report Timing text and GUI show the breakdown of clock uncertainty for each
timing path.