about a msater component access memory

Hello,

have a problem to ask everybody. I created a new component which is called master. It directly accessed memory such as SDRAM and SRAM¡K etc. I have to give it a memory address. But, i don't know to access these memory data in NiosII 5.0. If i use pointer to access, i worry other variables would modify these memory data. So, I would like to ask everybody about how to create a new variables or other data structure to protect these memory data.

Thank you.

Rote.