Question
Identify the correct sequence of steps A-D followed by the CPU as it processes each instruction in a program. A. Store B. Decode C. Fetch D. Execute Choose the correct answer from the options given below :
The correct answer is
C, B, D, A
The Central Processing Unit (CPU) executes program instructions through a cycle of operations. Understanding this cycle is fundamental to computer architecture.
CPU Instruction Cycle Steps
The typical sequence involves the following stages:
- Fetch: The CPU retrieves the next instruction from memory.
- Decode: The CPU interprets the fetched instruction to determine the required operation.
- Execute: The CPU performs the operation specified by the instruction.
- Store (or Writeback): The result of the execution is saved to memory or a register.
Mapping Steps to Labels
The question provides the following labels:
- A: Store
- B: Decode
- C: Fetch
- D: Execute
Following the standard instruction cycle (Fetch -> Decode -> Execute -> Store), the correct sequence using the given labels is:
| Order | Step Name | Label |
|---|---|---|
| 1 | Fetch | C |
| 2 | Decode | B |
| 3 | Execute | D |
| 4 | Store | A |
Therefore, the correct sequence of steps is C, B, D, A.
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Important Questions from Instruction Cycle
Execute Cycle of Computer is
A fetch cycle is the
- 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: The first machine cycle of an instruction is always a
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