DDR SDRAM controller for virtex 2 pro

I want to use a DDR SDRAM on my virtex 2 pro platform; however the vhdl controller available is for a 256Mb micron SDRAM; mine is a kingston kvr266x64c25/512 with 512MBytes ( actually 64Mx64). Can anyone help me? is it possible to adapt the opencore controller for my SDRAM? how??