New Contributor
Super ContributorSetting a fall time outside the period of the clock in your .sdc doesn't make sense. I'm surprised the tool let you do it. What happens when you set the -waveform to {3.0 8.0}?
And where are you seeing these setup and hold time numbers?
New Contributor-waveform to {8.0 13.0} is absolutely classic way of creating shifted clock. Only rising edge must be defined within <0, clk_period) time. How otherwise one would defined clock with phase shift more then 180 degrees. See create_clock -help for details.
For -waveform {4.00 9.00}
Ts is 6.667 ns
As for -waveform {3.00 8.00} setup relation will be 10.00 ns , because rising edge time is less then VCO period <3.333>
