Need help: Nios II Development Kit, Stratix II Edition and Stratix IV Edition

I'm a freshman working on the Nios II Development Kit, Stratix II Edition and Stratix IV Edition.

i designed a logic in my Stratix II Edition and Stratix IV Edition Development Kits which needs to interface with another carrrier board.

I want to use this Development Kits(Stratix II Edition and Stratix IV Edition) to interface with carrrier board which outputs signals of 5V.

I have read both the ref manuals (Stratix II Edition and Stratix IV Edition)...but unable to get the solution.

Can any one Pls tell me how can i interface my carrrier board outputs signals of 5V to my Stratix II Edition and Stratix IV Edition Development Kits?

Also request to pass me what sort of care to be taken while interfacing my Development Kits(Stratix II Edition and Stratix IV Edition) with carrrier board which is in VME card cage

Many thanks!

Sincerely

Krishna