SDRAM sharing between qsys components

Hello guys !!

I have to use a SDRAM controller in my QSYS system. In have to use the same SDRAM both for a nios CPU than the FRAME_READER component. I thought I had to introduce an appropriate offset so that the memory used by the cpu is not overwritten by the frame_reader and viceversa. By the way I can't figure out how to this..

Any suggestions ???

Thank you and have a nice day !