COMPUTER ARCHITECTURE

COMPUTER ARCHITECTURE

The computer is in a sense a communication system.

Data is constantly being moved between the CPU, memory and the various devices.

The CPU uses I/O addresses to direct data to particular devices.

The devices in turn use interrupts to notify the CPU and operating system of their needs.

The Von-Neumann Architecture

CPU Control Unit

Arithmetic Logic Unit

The Von-Neumann Loop

Fetch Phase

Fetch the next instruction and store it in the instruction register

Execute Phase

The ALU or I/O unit executes the instruction ALU does calculations

I/O unit loads or stores data between main memory and registers

 

 

 

•Reference :

•Stallings, William, Operating Systems, Second Edition, Prentice-Hall International Editions,Englewood Cliffs, New Jersey, 1995.

•Tanenbaum, Andrew S., Modern Operating Systems, Prentice-Hall International Editions, Englewood Cliffs, New Jersey, 1992.

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