When you try to compile the auto-generated PCI® Express Hard IP Root port VHDL testbench using NCSim, you may see errors such as the following:
ncvhdl_p: *E,EXPTYP (./..//pcie_tb/simulation/pcie_tb.vhd,1459|10):
ncelab: *F,EVNMRA: the entity specified \'WORK.PCIE_TB\' has no architecture
VHDL simulation is not supported for Root Port variants under NCSim.
This is not scheduled to be fixed in a future Quartus® software release.