On 23/11/2023 06:34, Shubhrajyoti Datta wrote: > The alt_ref is present only in Versal-net devices. > Other versal devices do not have it so lets make alt_ref optional. > Changing the order of the clock items to have the optional ones at > the end. One device has clock, other not, so you re-order the clocks? No, that's not the reason to re-order clocks. Add proper constraints for your variant. Best regards, Krzysztof