What are the basic elements of PROM and NVRAM?
NVRAMNonvolatile RAM (NVRAM) is a special kind of RAM that retains data when the computer is turned off or there is a power failure. It is powered by a battery within the computer. It can also work by writing its contents to and restoring them from an EEPROM. NVRAM is typically implemented so that the chip has same amount of RAM and some non-volatile memory in it. In normal operation all reads and writes access the RAM part of the chip. When normal operation power is lost the chip autiomatically copies the contents of the RAM to the non-volatile memory. Then the system is again powered up the contents of the non-volatile memory are copied back to RAM’s memory for normal system operation. PROMProgrammable Read-only memory (PROM) is an integrated non-volatile memoroy circuit that is manufactured to be empty. It can be later programmed with specific data. The programming can be done only once. After programming this data is always stored to this IC. Blank PROM chips can be bought inexpens
