can we use PIC to interface with 64mb sd ram?

[NavMicroSystems]

Nothing is impossible. . .

but you will need some more more components than just a PIC and Memory
(DRAM controller)

Don't forget: it is DynamicRAM

If you let the PIC do the hard job of filling up that 64meg Memory
and there is a BrownOut your Memory will have a BlackOut

rgds