Pipeline and Vector Processing Q.37

37Normally user programs are prevented from handling I/O directly by I/O instructions in them. For CPUs having explicit I/O instructions, such I/ O protection is ensured by having the I/O instructions privileged. In a CPU with memory mapped I/O, there is no explicit I/O instruction. Which one of the following is true for a CPU with memory mapped I/O ?

Option : A
Explanation : We have two regestion limit and base. So, when we refer memory location which is not in range provided by these two regestor is always cause OS to interface.

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