What is the first step in the instruction execution cycle? (i) Decode

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Module 2: x86 Architecture, CPU Control, I/O, Memory System Design

20242m

What is the first step in the instruction execution cycle?
(i) Decode
(ii) Fetch
(iii) Execute
(iv) Store

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Answer: (ii) Fetch

Instruction execution cycle: Fetch → Decode → Fetch Operands → Execute → Write Back/Store. First step is Fetch where PC is placed in MAR, instruction fetched from memory to MDR/IR and PC incremented.

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