Processor Architecture — A-Level Computer Science Revision
Revise Processor Architecture for A-Level Computer Science. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel and OCR.
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Go to Memory & StorageWhat is Processor Architecture?
Processor architecture refers to the design and organization of a computer's central processing unit (CPU). Key concepts include the Von Neumann and Harvard architectures, the fetch-decode-execute cycle, and the components of the CPU such as the arithmetic logic unit (ALU) and the control unit.
Board notes: A core topic for AQA, Edexcel, and OCR. Students should be able to describe the components of a CPU and explain the fetch-decode-execute cycle.
Step-by-step explanationWorked example
In the fetch-decode-execute cycle, the CPU first fetches an instruction from memory. It then decodes the instruction to determine what operation to perform. Finally, it executes the operation, which may involve retrieving data from memory, performing a calculation, or storing a result in memory.
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Common mistakes
- 1Confusing the Von Neumann and Harvard architectures.
- 2Not understanding the role of the different registers in the CPU.
- 3Incorrectly describing the fetch-decode-execute cycle.
Processor Architecture exam questions
Exam-style questions for Processor Architecture with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel and OCR specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Processor Architecture
Core concept
Processor architecture refers to the design and organization of a computer's central processing unit (CPU). Key concepts include the Von Neumann and Harvard architectures, the fetch-decode-execute cyc…
Frequently asked questions
What is the difference between RISC and CISC?
RISC (Reduced Instruction Set Computing) processors have a small set of simple instructions, while CISC (Complex Instruction Set Computing) processors have a large set of complex instructions. RISC processors are generally more efficient and consume less power.
What is pipelining?
Pipelining is a technique used to improve the performance of a CPU. It allows the CPU to overlap the fetch, decode, and execute stages of the instruction cycle, so that multiple instructions can be processed at the same time.