Simple version of SDR SDRAM controller
pll for de2_70 sdram
sdram: Fixed simulation mismatch bug.
sdram: added periodic internal refresh (for testing)
sdram: Internal refresh & updated memory map to use full memory (64MB)
SDRAM: Changes for BURST_LENGHT=1 support
SDRAM: simple SimpCon wrapper. JOP HelloWorld is working.
SDRAM: counter clean-up to use correct ranges (simulation ranges problem resolved)
sdram: Counter refactoring. The refresh & init are big and share one
counter, the rest share the small counter.
SDRAM: cleanup
SDRAM: indentation fixed
Added possibility for external refresh
SDRAM: Interface change for optional external refresh
Preparing files for repository change
Merge branch 'master' of ../patmos