PCIe as Soft-IP via CMU as transceiver in Stratix-IV

Hi,

in a design using a Stratix-IV EP4SGX230KF40, all regular transceiver channels are already used for other connections, but I want to connect a PC-module via a PCIe 1.1 x1 link.
Is this in any way possible? The CMU-channels are said to be usable for transceiver operation as well, but apparently they lack functionality to be connected to the PCIe Soft-IP
core.
Any advice?
Thx