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Lecture 1: Course introduction - page 7 / 15

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Memory types

Classification by access Registers: Internal to the CPU Cache: Tightly linked to the CPU

Semiconductor

Registers

Cache

Main memory: Connected to system buses

Main Memory

Secondary memory: On-line Archival: Off-line

Magnetic/Optical

Secondary Memory

Archival Storage

Classified by technology Semiconductor

Random Access Memory (RAM) Volatile, Read and write

Semiconductor

Magnetic

memory

memory

Read Only Memory (ROM) Non-volatile, Can only be read

MEMORY ACCESS Registers Cache Main memory Secondary memory Archival storage

RAM X X X

ROM

Disk

Tape

Optical

X

Virtual X

X

X X

Magnetic memory Disk, Tape

Optical CD-ROM

RAM

ROM

Disk

MEMORY TECHNOLOGY

Tape

Microprocessor-based System Design Ricardo Gutierrez-Osuna Wright State University

Fast and Expensive

Cheap and Slow

Optical memory

CDROM

7

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