Friday, February 19, 2016

Von Neumann Architecture

Von Neumann Computer Model

Von Neumann Architecture - Blocks
  • Contains three main blocks: CPU, Memory, IO devices
  • These blocks are connected together using System Bus
Von Neumann Architecture - Components
  • Memory – Storage of Information (program and data)
  • Processing Unit – Computation/Processing of Information
  • Input – Getting information in to computer
  • Output – Getting information out of computer
  • Control Unit – Monitor and control all the above
Key Points:
  • A memory to store both program and data
  • Address and Data bus are shared between program and data memory
  • CPU is allowed to access either program or data memory at a time
  • Limited data transfer between CPU and memory
  • Program can be easily modified by itself since it is stored in read-write memory
  • It offers flexibility like executing code in data memory. Programs are written as data then executed as instructions. And having a uniform address space means that main memory can be used as instructions or data as different situations demand.
  • Also known as Princeton Architecture.
  • Limited throughput because of single & shared bus design.
  • CPU is continually forced to wait for needed data to be transferred to or from memory.
  • Providing cache between CPU and Memory
  • Providing separate caches for program and data
  • Providing CPU stack or other on-chip scratchpad memory to reduce memory access

Related topics:
Harvard Architecture   |   Von Neumann Vs Harvard Architecture   |   Modified Harvard Architecture   |   Microprocessor Vs Microcontroller   |   Choosing a Microcontroller

List of topics: Microcomputer

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