NIMCET 2010 Computer PYQ — For a microprocessor using mapped :… | Mathem Solvex | Mathem Solvex
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NIMCET 2010 — Computer PYQ
NIMCET | Computer | 2010
For a microprocessor using I/O mapped I/O:
Choose the correct answer:
A.
Memory and I/O addresses are distinct
B.
Not all data transfer instructions are available for I/O
C.
Both (A) and (B)
(Correct Answer)
D.
None of above
Correct Answer:
Both (A) and (B)
Explanation
Solution
The correct answer is: (c) Both (A) and (B)
Explanation
I/O mapped I/O (also known as Isolated I/O) is a method where the microprocessor treats memory and input/output devices as two separate entities.
Distinct Address Spaces: In this scheme, the address space for memory and I/O are separate. This means the CPU can have a memory address 0000H and an I/O port address 0000H without conflict because it uses a control signal (like IO/M) to distinguish between them.
Limited Instructions: Unlike Memory Mapped I/O, where any instruction that references memory can be used for I/O, Isolated I/O uses specific instructions (typically IN and OUT) to perform data transfers. General data transfer instructions used for memory (like MOV or LDA) cannot be used for I/O devices.
Explanation
Solution
The correct answer is: (c) Both (A) and (B)
Explanation
I/O mapped I/O (also known as Isolated I/O) is a method where the microprocessor treats memory and input/output devices as two separate entities.
Distinct Address Spaces: In this scheme, the address space for memory and I/O are separate. This means the CPU can have a memory address 0000H and an I/O port address 0000H without conflict because it uses a control signal (like IO/M) to distinguish between them.
Limited Instructions: Unlike Memory Mapped I/O, where any instruction that references memory can be used for I/O, Isolated I/O uses specific instructions (typically IN and OUT) to perform data transfers. General data transfer instructions used for memory (like MOV or LDA) cannot be used for I/O devices.
