We are using FPGA 5CGXFC4C6F27C7N in our application, which has high speed interfaces, so PCIe hard IP is mandatory, please suggest any low cost alternative to this part.
Read the Cyclone V product table. It lists hard IP core-capable FPGAs.
P.S.: It is not mandatory to use hard IP for PCIe; Soft cores which meet timing could do the same at the cost of longer design time.For more complete information about compiler optimizations, see our Optimization Notice.