For jitter, it is best to use the default values used by the Vivado Design Suite. You can modify the default computation as follows:
- If a primary clock enters the device with a random jitter greater than zero, use
the
set_input_jittercommand to specify the peak-to-peak jitter value in nanoseconds. - To adjust the global jitter if the device power supply is noisy, use
set_system_jitter. AMD does not recommend increasing the default system jitter value.
The master clock and the characteristics of the clock modifying block derive the jitter for generated clocks. You do not need to adjust these numbers.