Concept Of system Buses

COMPUTER SYSTEM

COMPUTER SYSTEM

  1. Input Unit
  2. Output Unit
  3. Processor

  1. Control Unit
  2. Arithemetic and Logic Unit
  3. Registers

  1. Data Bus
  2. Address Bus
  3. Control Bus

  1. Primary Memory
  2. Secondary Memory

The components inside your computer talk to each other in various different ways. Most of the internal system components, including the processor, cache, memory, expansion cards and storage devices, talk to each other over one or more "buses".A bus, in computer terms, is simply a channel over which information flows between two or more devices (technically, a bus with only two devices on it is considered by some a "port" instead of a bus). A bus normally has access points, or places into which a device can tap to become part of the bus, and devices on the bus can send to, and receive information from, other devices. The bus concept is rather common, both inside the PC and outside in the real world as well. In fact, your home telephone wiring is a bus: information flows through the wiring that goes through your house, and you can tap into the "bus" by installing a phone jack, plugging in the phone and picking it up. All the phones can share the "information" on the bus.

There are mainly three types of internal buses as follow:

  • Data bus:

    This is the line or path for as actual data flow to be sent to the components. In other words, this is a collection of dedicated circuits and wires that move information in and out of the CPU, same as a highway or super highway for vechile.

  • Address Bus:

    This is where data and instruction are sent from one components to another using address bus. The address bus is a set of wires that allow bits of information with memory addresses for the CPU. The addresses in these buses help in locating the data in system memory(ram).

  • Control Bus:

    Control Bus is a signal that is sent by the CPU that coordinates and controls all the actions of the system. In addition, there are a number of control lines that controlhow the bus functions and allows users of the bus to signal where data is available.
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