Nonvolatile RAM also known as
NVRAM,is a special RAM variation that is able to hold its data eve after external power is removed.There are two common types of
NVRAM.The first type of
NVRAM is known as battery-backed RAM,contains a
static RAM along with it own permanently connected battery.When external power is removed or drops below a certain threshold,the internal battery maintains power to the
SRAM and thus the memory continues the to store the bits.The second type of
NVRAM contains a
Static RAM as well as an
EEPROM or flash having the same capacity as the
Static RAM.This type of
NVRAM stores its complete RAM contents into the EEPROM just before the power is turned off,or whenever instructed to store the data and then reloads that data from
EEPROM into RAM after power is turned back on.
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