Memory Refresh:
- Is the process of periodically reading information from an area of computer memory, and immediately rewriting the read information to the same area with no modifications.
- Each memory refresh cycle refreshes a succeeding area of memory.
- Memory refresh is most often associated with modern dynamic random access memory. However, several early computer memory technologies also required periodical processes similar in purpose.
- These technologies include delay line memory and Williams tube.
- Compare with magnetic core memory where each memory cell needs to be refreshed after being read, but periodical refreshes are not necessary.
- Also, see static random access memory which is used in similar applications as dynamic random access memory, but does not require refreshing (hence labeled static as opposed to dynamic).
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