UGC-NET | UGC-NET CS 2017 Nov – III | Question 5

Which of the following is correct statement ?
(A) In memory – mapped I/O, the CPU can manipulate I/O data residing in interface registers that are not used to manipulate memory words.
(B) The isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment.
(C) In asynchronous serial transfer of data the two units share a common clock.
(D) In synchronous serial transmission of data the two units have different clocks.


Answer: (B)

Explanation:

  • The isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment.
  • Memory based I/O uses same address space for memory and I/O devices.
  • In asynchronous serial transfer of data the two units do not share a common clock.
  • In synchronous serial transfer of data the two units share a common clock.

Refer:I/O interface
Option (B) is correct.

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