The computer needs to process each instruction with the following sequence of steps:
A. Calculate the effective address
B. Fetch the Instruction from memory
C. Decode the instruction
D. Fetch the operands from the memory
E. Execute the Instruction
Choose the correct answer from the options given below:
1.A, B, C, D, E
2.B, A, D, A, E
3.B, C, A, D, E ✓ Correct
4.C, B, A, D, E
Solution
The Correct Answer is: Option 3
Key Points
- When a computer processes an instruction, it follows a structured sequence of steps to ensure accurate execution.
- The correct sequence is:
- Step 1: Fetch the instruction (B) - The CPU retrieves the instruction from memory.
- Step 2: Decode the instruction (C) - The CPU interprets the fetched instruction to understand what needs to be done.
- Step 3: Calculate the effective address (A) - The CPU determines the address of any operands or data required for execution.
- Step 4: Fetch the operands (D) - The CPU retrieves the necessary operands or data from memory.
- Step 5: Execute the instruction (E) - The CPU performs the operation specified by the instruction.
- This sequence ensures the CPU processes each instruction correctly.
Additional Information
- Fetch: The instruction is retrieved from memory to the CPU.
- Decode: The CPU decodes the instruction to understand its type and required operation.
- Effective Address Calculation: The CPU calculates the actual memory address needed to fetch operands.
- Operands Fetch: The required data or operands are retrieved from memory.
- Execute: The operation specified in the instruction is carried out.
Hence, the correct sequence is: Option 3) B, C, A, D, E
