Move data fast inside memory

Hi.

I'm wonderng if any could expain for me how to solve my Project.

I'm an old amiga demo coder and would like to test my skills on a de2-115 board.

I have looked at the UP ip library.
The missing part is a dma controlled blitter.
I want to move an amount of data inside the memory from address a to address b length c.

I want to make a Component for qsys.
The cpu will only sett the addresses and length. And a start bit of this operaton.

I know how to make a simple Component that uses Avalon slave.
But i guess i mabie need data streaming?
I tryed to write to the addressbuss. But qsys did not like that idea.

Do you have any idea?

BR
Terje.