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Presentation transcript:

Buses

BUS What is a bus? is a group of parallel wires which carry electrical signals between different parts of the computer. Most computers have three main buses: the data bus the address bus the control bus

The data bus Is the data bus uni- or bidirectional and what does it mean? data flow in either direction. What is the function of the data bus? It carries data and instructions from the memory to the CPU and from the CPU to memory.

The address bus Is the address bus uni- or bidirectional and what does it mean? unidirectional = data flow one way only. What is the function of the address bus? It carries addresses from the processor to memory.

The control bus Is the control bus uni- or bidirectional and what does it mean? data flow in either direction. What is the function of the control bus? It carries instructions to and from the CPU and other parts of the computer.