Question 147 of 319

A common communication pathway shared by hard- ware components in the computer is called? 

  • A.   bus
  • B.  channel
  • C.  firmware
  • D.   register.

Correct Answer: A

Explanation
The correct option is A. bus. Detailed Explanation
  1. Definition of a Bus:
  2. In computer architecture, a bus is a communication system that transfers data between components inside a computer or between computers. It is a shared pathway that allows multiple hardware components, such as the CPU, memory, and input/output devices, to communicate with each other.
  3. Functionality of a Bus:
  4. A bus consists of a set of physical connections (wires or traces on a circuit board) and a protocol that defines how data is transmitted. It can carry data, addresses, and control signals. The bus architecture allows for efficient communication and reduces the number of pathways needed for data transfer, which simplifies the design of the computer.
  5. Types of Buses:
  6. There are several types of buses, including:
    • Data Bus: Carries the actual data being transferred.
    • Address Bus: Carries the addresses of the data (where the data is coming from or going to).
    • Control Bus: Carries control signals from the CPU to other components to manage operations.
  7. Why Other Options Are Incorrect:
  8. B. Channel:
    • A channel typically refers to a specific pathway for data transfer, often used in the context of direct memory access (DMA) or communication between devices. While it can be a communication pathway, it is not as general or widely applicable as a bus. Channels are often more specialized and may not serve as a common pathway for all hardware components.
  9. C. Firmware:
    • Firmware is a type of software that provides low-level control for a device's specific hardware. It is not a communication pathway but rather the software that runs on hardware to control its functions. Firmware is stored in non-volatile memory and is essential for the operation of hardware but does not facilitate communication between components.
  10. D. Register:
    • A register is a small amount of storage available directly in the CPU for quick data access. Registers are used to hold temporary data and instructions during processing. They are not communication pathways; instead, they are storage locations that facilitate the CPU's operations. Registers operate at a much smaller scale compared to buses.
Summary of Key Points
  • A bus is a shared communication pathway for hardware components in a computer.
  • It allows for the transfer of data, addresses, and control signals between the CPU, memory, and I/O devices.
  • Other options like channel, firmware, and register do not serve the same general purpose as a bus in facilitating communication among all hardware components.
Revision Summary
  • A bus is essential for communication between computer components.
  • It consists of data, address, and control lines.
  • Other terms like channel, firmware, and register refer to specific functions or types of data handling, not general communication pathways.
  • Understanding the role of a bus is crucial for grasping computer architecture and data transfer mechanisms.
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