Department of Computer Scien

ce and Information Engineering

National Cheng Kung University

HANEL

SEMI-

CONDUCTOR MEMORY

ROM

EPROM (Erasable Programmable

ROM)

‰EPROM was invented to allow making changes in the contents of PROM after it is burned

¾In EPROM, one can program the memory chip and erase it thousands of times

‰A widely used EPROM is called UV-EPROM

¾UV stands for ultra-violet¾The only problem with UV-EPROM is that erasing its contents can take up to 20 minutes¾All UV-EPROM chips have a window that is used to shine ultraviolet (UV) radiation to erase its contents