Explain Device Controller in brief

Lists of Questions Answers and Short Study Notes On OS Input Output

  • (1)Write a short note on Device Controller. OR Explain Device Controller in brief.

 

Questions-1 Write a short note on Device Controller. OR Explain Device Controller in brief.

  • I/O unit consist of a mechanical component and an electronic component. Electronic component of I/O devices is called the Device Controller.
  • The mechanical component is device itself.
  • The controller card usually has a connector on it, into which a cable leading to the device itself can be plugged.
  • Some devices have their own built in controller. Many controllers have two, four or even eight identical devices.
  • If the interface between the controller and device is a standard interfacing (ISO, ANSI or IEEE), then companies can make device or controller that fit that interface.
  • The controllers are used to convert the serial bit stream into a block of bytes and perform any error correction if necessary.
  • The block of bytes is typically first assembled bit by bit in buffer inside controller.
  • After verification, the block has been declared to be error free, and then it can be copied to main memory.