how can i write custum pcie card driver for simulink real time (xpc) ?

Hi. i need to work with simulink real time or xpc target for running real time application but my pci express frame grabber is not supported in simulink libraries. as i searched in mathwork help it , it was mentioned that i should create custom driver block but there were just ISA and PCI noted. how can i create my custom driver for pci express frame grabber?