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Summary fetch decode execute cycle - SLR1 OCR ALEVEL COMP SCI

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Notes regarding the fetch decode and execute cycle following the ocr alevel computer science spec

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OCR
Subject
Computer Science
Unit
SLR 1 - Systems architecture
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Uploaded on
June 20, 2024
Number of pages
5
Written in
2023/2024
Type
Summary

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Topic: Fetch-decode-execute cycle


Questions Notes




Fetch




 PC is checked – as it holds the address of the next instruction to be
executed
 Address from PC Is copied into MAR

,  Address is sent along address bus to RAM – then waits for a signal from
control bus
 The control unit sends a read signal along the control bus to main
memory




 Contents stored in memory can be sent along the data bus to memory
data register
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