System bus

11.3.2.2 describe the purpose of CPU components, system bus and main memory

System bus

Bus - microscopic parallel wires that transmit data between internal components.

The main bus is the SYSTEM BUS

Its actually made up of 3 separate buses, but when we join them together we can just call it the System Bus

System bus – the main highway connecting the CPU, the main memory and I/O controllers;
it is made up of a data bus, an address bus and a control bus.

Data bus - transfers data between the processor and memory. 

Address bus - used to specify a physical address in memory so that the data bus can access it. 

Control bus - controls the flow of data between the processor and other parts of the computer.

Address bus is unidirectional (signals travel in one direction only).

Data bus is Bi-directional (data can travel in both directions).

Control bus is regarded as being both unidirectional and bi-directional due to the internal connections within the computer architecture.

Questions:

What is a computer bus?
  • A set of parallel wires connecting independent components of computer system.
System bus includes …
  • Control bus, Address bus, System bus
What is an I/O controller?
  • I/O controller is an electronic circuit than one side connects to the system bus and on the other side connects to an I/O device.
Explain the role of the address bus, data bus and main memory
  • Address bus - used to specify a physical address in memory so that the data bus can access it.
  • Data bus - transfers data between the processor and main memory.
  • Main memory - stores data and instructions that will be used by the processor.

Exercises:

Ex.1 

Категория: System architecture | Добавил: bzfar77 (06.09.2020)
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