A question about sram vs. sdram

SDRAM is Cheaper and larger Capacity than SRAM. E.g. SDRAM is usaully >8MB, and SRAM is <1MB.

However, you need a dedicate logic (such as SDRAM controller) to access SDRAM, while SRAM is easily to access. Because SDRAM using clock and need to refresh itself periodly.

Yeah, it is capacity V.S. complexity.

Different OS or different configuration of the same os, has different code size, between <1M and >1M, so both sram and sdram can be used in OS-based application.