Von neumann Architecture and Harvard Architecture

There are two types of architecture

1. Von neumann Architecture 
2. Harvard Architecture 

Von neumann Architecture

• It support simple hardware
• One data path or bus exist for both instruction and data
• Cpu does one operation at a time
• Data sharing common bus
• Single sequential memory
• Very fast but small amount of memory
• processor need to fetch code in a separate clock cycle and data in another clock cycle so it is required two clock cycle
• Higher speed, thus less time consuming
• Simple in design

ex: 8051 controller

Harvard Architecture 

• It offers a separate storage buses for Instruction and data
• Allow simultaneously access to both instruction and data
• Single clock cycle is sufficient, as separate buses are used to access code and data
• Slower in speed thus more time consuming
• Complex in design

ex: PIC and ARDUINO controller