Von Neumann Vs Harvard Architecture

Comparison of Von Neumann and Harvard Computer Architecture

Von Neumann	Harvard
The name Harvard Architecture comes from the Harvard Mark I relay-based computer	The von Neumann Architecture is named after the mathematician and early computer scientist John von Neumann
Same memory holds data, instructions	Separate memories for data and instructions
A single set of address/data buses between CPU and memory	Two sets of address/data buses between CPU and memory
CPU is allowed to access either program or data memory at a time. data transfers and instruction fetches must be scheduled	It is possible to access program memory and data memory simultaneously
Program memory is read-write	Program memory is read only
program can be easily modified by itself since it is stored in read-write memory	impossible for program contents to be modified by the program itself
Unified cache should be used	Separate cache should be used
Program and data memory characteristics must be same	Program and data memory characteristics need not be same

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

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List of topics: Microcomputer

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