Discussion
Which of the following memories needs to be refreshed after certain amount of time?
Answer: B
The memory that must be refreshed is DRAM.
Dynamic RAM stores each bit as a charge on a tiny capacitor. The charge leaks away within milliseconds, so the memory controller must read and rewrite every cell periodically, a process called refreshing. DRAM is cheap and dense, which is why it is used as main memory.
Static RAM (SRAM) stores each bit in a flip-flop that holds its state as long as power is supplied, so it needs no refresh; it is used for cache. ROM and PROM are non-volatile and keep their contents without power or refresh.
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