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Question 50Asked in UGC NET Computer Science, November 2017 (Paper II & III, Selected Questions)

Which of the following is correct statement?

  1. AIn memory-mapped I/O, the CPU can manipulate I/O data residing in interface registers that are not used to manipulate memory words
  2. BThe isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment
  3. CIn asynchronous serial transmission of data the two units share a common clock
  4. DIn synchronous serial transmission of data two units have different clocks
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Correct answer: (B) The isolated I/O method isolates memory and I/O addresses so that memory address range is not affected by interface address assignment

Explanation

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

From UGC NET Computer Science PYQ, November 2017 (Paper II & III, Selected Questions)

This is question 50 of UGC NET Computer Science PYQ, November 2017 (Paper II & III, Selected Questions). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.