Error (272006): LPM_WIDTHU parameter has been set to illegal value 4, but should be set to value 5.

Description

The above error will be seen when compiling the Cyclone® V Avalon-MM Hard IP for PCI®Express in Root Port configuration.
This error is related to an issue with the Quartus® II software.

Resolution

Open the file altpciexpav_stif_cr_rp.v and change the parameter lpm_widthu from 4 to 5.

from
.lpm_widthu(4),
to
.lpm_widthu(5),

This problem is fixed in version 15.0.1 and later of the Quartus II software IP.