pci express in Cyclone IV GX EP4CGX150BF14 FPGA

[Altera_Forum]

i have cyclone IV GX EPCGX150f14 FPGA and i want to test the pci express with a loopback . 

Thanks for any help you could offer.

[Altera_Forum]

It's great that You want to do that. But where is the problem? I see no questions, so there are no problems?

[Altera_Forum]

I am a beginner in the PCI Express communication protocol. 

First there are two IP configuration mode , root port and endpoint, I don't understand the difference between the two modes.  also I want to know the steps for configuring the IP and how the interface between IP and my application to be able to make transactions.

[Altera_Forum]

Well the words "root port" and "endpoint" talks for themselves, however You can easily find the answer in Wikipedia. For test purposes, try the factory examples from Altera.

[Altera_Forum]

IIRC the Altera PCI Express IP doesn't support very well the rootpoint functionality. Last time I checked it supported only at a very low level and you had to do a lot by hand.