RAM is
volatile memory. It is part of basic memory of computer. In RAM, data is lost
when power is turned off. RAM is of two types:
1. Static
RAM
2. Dynamic
RAM
Static RAM (
SRAM ) : The word 'static' indicates that the memory retains its content as
long as power remains applied. It means this RAM will maintains its data as
long as power is provided to memory chips. Data is lost when power gets down
which makes SRAM a volatile memory as opposed to ROM. It does not need to be
refreshed periodically. SRAM is very fast but much more expensive than DRAM.
Due to its speed it is used as cache memory.
Dynamic RAM
( DRAM ) : In DRAM, data moved in and out of memory repeatedly for as
long as power is available. Electricity always has to be flowing through the
chip to keep refreshing the memory. Unlike SRAM, DRAM must be continually
refreshed in order to maintain the data. This is done by placing the memory on
a refresh circuit that rewrites the data several hundred times per second. DRAM
is used for most system memory because it is cheap and small.
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