An instruction cycle is?

An instruction cycle is?

• A. The time to fetch an instruction
• B. The time it takes to execute an instruction and may take one clock cycle or several
• C. The time to decode an instruction
• D. The time to fetch and decode

Answer: (B)

The instruction cycle is the period during which one instruction is processed from start to finish. It covers fetching the instruction from memory, decoding what the instruction means, and executing the operation that the instruction specifies. The time this takes isn’t fixed; some instructions complete in a single clock cycle, while others require several clock cycles to finish because they involve more complex operations or memory access. So, the best choice describes it as the time to execute an instruction, recognizing that execution can take one or multiple clock cycles, depending on the instruction and the CPU design. The other options focus only on fetching, decoding, or just fetch plus decode, which don’t capture the full execution and the potential multi-cycle nature of completing an instruction.

The instruction cycle is the period during which one instruction is processed from start to finish. It covers fetching the instruction from memory, decoding what the instruction means, and executing the operation that the instruction specifies. The time this takes isn’t fixed; some instructions complete in a single clock cycle, while others require several clock cycles to finish because they involve more complex operations or memory access. So, the best choice describes it as the time to execute an instruction, recognizing that execution can take one or multiple clock cycles, depending on the instruction and the CPU design. The other options focus only on fetching, decoding, or just fetch plus decode, which don’t capture the full execution and the potential multi-cycle nature of completing an instruction.