Department of Computer Scien

ce and Information Engineering

National Cheng Kung University

HANEL

SEMI-

CONDUCTOR MEMORY

RAMNV-RAM

(Nonvolatile RAM)

‰NV-RAM combines the best of RAM and ROM

¾The read and write ability of RAM, plus the nonvolatility of ROM

‰NV-RAM chip internally is made of the following components

¾It uses extremely power-efficient SRAM cells built out of CMOS¾It uses an internal lithium battery as a backup energy source¾It uses an intelligent control circuitry

ƒThe main job of this control circuitry is to monitor the V

pin constantly to detect loss of cc

the external power supply