Sdram access in HDL and Nios II

i have made avalon master components and my own DMA access to an offchip SDRAM using my avalon master and an SDRAM controller. Its not very hard especially if you are just doing writes and no reads. Reads take a little bit more work.

You can also have the nios hooked up as a master to the sdram controller. You can have to masters hooked to one slave unit and then you can set the arbitration priority in sopc builder so that either nios or your component have acess priority.

Also as they told you above for really small amount of memory, you could probably just use an onboard memory hooked up as a slave in SOPC or embed it within your component.