Mechatronic Systems Engineering 2202A/B Lecture Notes - Lecture 5: Eeprom, Eprom, Address Bus
23 Jan 2020
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Document Summary
Memory stores binary data in one or more ics. Memory size is determined by the width of address bus. Memory cells are essentially large numbers of storage cells with each cell capable of storing either a 0 or 1 bit. Storage cells are grouped in locations with each location storing one word. Each location is identified by a unique address. 4-bit address bus can access 24 = 16 different locations. The size of a memory unit is specified in terms of the number of storage locations available: Used for fixed programs, e. g. , dedicated microprocessor applications. Do not lose their memory when power is removed. Rom chips that can be programmed by the user. Every memory cell initially has a fusable link which keeps memory at 0. Permanently opened by applying current to the fuse. Cells store charges, programmed by producing a pattern of charged and uncharged cells. Memory erased by shining ultraviolet light through quartz window.
