Altera_Forum
Honored Contributor
Honored ContributorRelationships and differences among kinds of memories ?
Newbie question again!
What are the relationships and differences among DRAM, SRAM, SDRAM ? Somebody knows please tell me, thanx a lotForum Discussion
2 Replies
Altera_ForumDRAM ( dynamic RAM ) are cell's that holds data using capacitor, so they are usually slower than other kinds, but they're cheap (~1 trans). an example of DRAM is your computers RAM module. problem is, the capacitor will discharge, so they have to rewrite time to times ( using onboard dram controller ) to "refresh" data.
SRAM ( static RAM ) on the other hand are flip-flip based, they catch a bit in their circullar path. they are small, and fast but need ~6-8 trans. many of the onchip memories ( like CPU's cache, rf, scratchpad ) are SRAM based. I think Altera's Ram block like m9k follows this too. SDRAM is DRAM with Sync. clock interface. like computer's RAM module.- Altera_Forum
http://en.wikipedia.org/wiki/random_access_memory#types_of_ram explains all major memory types.
