Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

SDRAM Interface to SO-DIMM?

I'm planning a NiosII design and we need a pile of RAM but don't need the high bandwidth of SRAM. It's hard to find SDRAM chips in stock, given their commodity nature, and so I was looki...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

Hi Mike,

Just to clarify: I think the danger here is that in conventional Nios II applications, your code must be linked against a known memory map (that is how the linker figures out where to start the stack). If you suddenly change the amount of memory in your SODIMM, the system will no longer function (specifically, if the memory is smaller than what you linked against).

More complex systems, employing an MMU, operating system with loader, and bios of some sort, can allow a dynamic system where memory size & type are detected at boot-up (in this case, the application code is not linked against a hard-coded memory map)... we are not there yet with Nios II, but keep your eyes open.....