Question

The sequence of events that happen during a typical fetch operation is:
(A) MAR
(B) IR
(C) MDR
(D) Memory
(E) PC
Choose the correct answer from the options given below:

• A. (E), (A), (C), (B), (D)
• B. (E), (A), (D), (C), (B)
• C. (A), (E), (C), (B), (D)
• D. (E), (A), (C), (D), (B)

Hint:

The sequence can be remembered as PC → MAR → Memory → MDR → IR.

Answer 1

The Correct Option is D

A standard instruction fetch operation involves the following steps: 1. PC (Program Counter): Stores the address of the instruction for retrieval. 2. MAR (Memory Address Register): Obtains the address from the PC. 3. Memory: Retrieves the instruction from the location specified by the MAR. 4. MDR (Memory Data Register): Contains the retrieved instruction. 5. IR (Instruction Register): Retains the instruction for subsequent execution.