System Design Bus

1. Type of Bus

• Dedicated: Data Bus and Address Bus has a separate line, the design is more expensive and the data transfer rate is higher.
• Multiplexed: Line Data and Address rolled into one, plan cheaper and the data transfer rate is slower.

 

  

 

     

 2. Method arbitration

• Centralized.
• Distributed.

 3. Timing

• Synchronous.
• Asynchronous.

 4. Bus width

• Address
• Data 

 5. Type of data transfer

• write.
• Read.
• Read modify write.
• Read after write.
• Block.

 

BUS System

   Definition: BUS is a means of transporter / channel contained within a microprocessor (CPU) that connects the microprocessor to the outside world, Only devices addressed by the signals pay attention to them, the others discard the signals.

The microprocessor (CPU), there are 3 basic BUS system:

•  Data BUS        (bi-directional)
•  Address BUS     (uni-directional)
•  Control BUS     (uni-directional)  

A .Data Bus  

• Handles the transfer of all data and instructions between  functional areas of the computer. 
• The data bus is usually used as a taxonomy of microprocessor concerned.
• Only transmit in one direction at a time.
• Used to transfer instructions from memory to the CPU for execution.
• Used to transfer data between memory and the I/O section during input/output operation.

BUS