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Altera_Forum
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15 years ago

Generating small rom & ram for Cyclone 3

MegaFunction wizard doesn't seem to allow using Logic Cells for small roms & rams in Cyclone 3 as it allows in Cyclone 2. I don't want to use a M9K for a small memory block. Anyway to get aroun...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

On second thought, I think I just made sense on what's going on.

With RAM/ROM megafunctions, Quartus allows one to change MIF files and the quickly update the programming files without recompiling the entire design.

However, this is only feasible when using dedicated memory blocks.

Thus, the following restrictions are observed:

a) ROM megafunctions (which have to have a MIF file) must use dedicated memory blocks

b) RAM megafunctions that force the usage of LEs do not support MIF files

So, you need to go with "b)" for any small ROMs and initialized RAMs