Question about root port bus functional model

de_prince,

If your design is a PCIe root port (not an end point), you'll need a BFM that acts as an endpoint. Other than what Altera has, I'm not aware of any low cost BFMs to do that. If your design is an endpoint, then you need a root port BFM to drive it, and both Altera's BFM and DrivExpress should work for simulation. You might find other product out there, too, but those are the two I'm aware of.