Have anyone coverted a Xilinx PCI core to an Altera PCI core

The Xilinx PCI core is sticky IP. Meaning you will not be able to move it from a Xilinx chip to an Altera chip. However, you may be able to replace the Xilinx PCI core to an Altera PCI core. It depends how closly the signals match on each Core. Also, if you don't want to pay for a new pci core you can always goto opencores (http://www.opencores.org/projects.cgi/web/pci/home). They have an open source PCI core (Master & Target).