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Explain the role of main memory in the execute stage of the Fetch-Execute cycle - AQA - GCSE Computer Science - Question 10 - 2023 - Paper 2
Question 10
Explain the role of main memory in the execute stage of the Fetch-Execute cycle. Data required (by an instruction) may be fetched from main memory. An instruction m... show full transcript
Worked Solution & Example Answer:Explain the role of main memory in the execute stage of the Fetch-Execute cycle - AQA - GCSE Computer Science - Question 10 - 2023 - Paper 2
Step 1
Explain the role of main memory in the execute stage of the Fetch-Execute cycle.
Answer
In the execute stage of the Fetch-Execute cycle, main memory plays a crucial role in both retrieving data needed for instruction execution and saving the results of executed instructions.
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Fetching Data: The CPU may need to access operands (data) stored in main memory to carry out the operation specified by the instruction being executed. This process allows the CPU to perform calculations and manipulations as required by the program.
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Storing Results: After processing the data, the CPU may store the outcome back into main memory. This is essential for ensuring that data is not lost and can be used in subsequent instructions, maintaining the integrity of the program's execution.
Step 2
Describe the other two stages of the Fetch-Execute cycle.
Answer
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Fetch stage: The next instruction is fetched from the memory (to the CPU). This means that the instruction is retrieved from the memory address that the program counter points to.
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Decode stage: The instruction is decoded to understand what operation needs to be performed. During this stage, the CPU interprets the instruction and prepares the necessary actions or data required for execution.