Von Neumann Architecture Stored-Program Architecture.

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Presentation transcript:

Von Neumann Architecture Stored-Program Architecture

Introduction:  The Von Neumann architecture is a design model for a stored-program digital computer.  The Most Important feature is the Memory that can holds both Data and Program.

History:  In 1945, just after the World War, Jon Von Neumann proposed to build a more flexible computer.  Von Neumann had been working on the Manhattan Project to build the first atomic bomb which needed a vast amount of manual calculations.

 Up to that time, the computers were 'programmed' by rebuilding the entire machine to carry out a different task.  For example, the early computer called ENIAC took three weeks to re-wire in order to do a different calculation.

 The new idea was that not only the data should be stored in memory, but the program processing that data should also be stored in the same memory.  A computer built with this architecture would be much easier to re-program.  Effectively the program by itself is Treated as a data.

Features of Von Neumann Architecture:  Memory: In this Architecture, Memory can hold both data and also the program processing that data. In modern computers this memory is called RAM.  Input – Output: This architecture allows the users to interact with the Computer.

 Arithmetic Logic Unit: (ALU) This part of the architecture carries out calculations upon the data.  Control Unit: (CU) The CU manages the process of moving data and program into and out of memory and also deal with execution of program instructions - one at a time. The 'one-at-a-time' phrase means that the von Neumann Architecture is a sequential processing machine. Central Processing Unit: