b.1.3 cpu architecture & operation
Meet the boss. Go inside the Central Processing Unit to see how the Control Unit and ALU execute billions of instructions per second using the Fetch-Decode-Execute cycle.
The CPU (Central Processing Unit) is the brain of the operation. It’s a relentless worker that never sleeps, processing billions of instructions every single second. But how does it actually "think"? It follows a strict rhythm called the Fetch-Decode-Execute cycle: fetch an instruction, figure out what it means, and do it. We’ll look inside to see the ALU (the calculator), the Control Unit (the traffic cop), and the tiny, super-fast storage slots called Registers. We even look at how modern CPUs use multiple cores to multitask like a pro.
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This section outlines the progression of knowledge regarding CPU Architecture and Operation from KS2 through to KS5 and beyond. The curriculum is mapped explicitly to ensure that foundational concepts surrounding the Central Processing Unit as the "brain" of the computer scale upwards in complexity. By KS5, students are evaluating highly complex concepts such as pipelining, RISC versus CISC architectures, and System on a Chip (SoC) integration. The mapping ensures a strict pedagogical alignment where every theoretical concept is immediately anchored by a practical or analytical application, ensuring students do not merely memorise hardware terms but truly understand the mechanics of computation.
Last modified: March 20th, 2026
