In memory mapped I/O

Asked In: BPSC TRE 1.0

Options

  • A. the I/O devices and the memory share the same address space
  • B. the I/O devices have a separate address space
  • C. the memory and I/O devices have an associated address space
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

A. the I/O devices and the memory share the same address space

Detailed Explanation

Correct Answer: Option A.

Explanation: In memory-mapped I/O, memory locations and I/O device registers share the same address space. The CPU accesses device registers using ordinary memory-access instructions such as load and store. Address decoding determines whether an access is directed to RAM or an I/O device. Option B describes isolated I/O.
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BPSC TRE 4 operating system practice set 3

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