The Fetch-decode-execute cycle -page 3 (and 4) 0.0 / 5 ? ComputingComputer systemsFetch-decode-execute cycleGCSEEdexcel Created by: emj790Created on: 20-01-18 15:37 How does the CPU use the fetch-decode-execute cycle? It uses the cycle to carry out the program instructions 1 of 21 What happens during the the fetch stage? Instructions and data are transferred from the RAM to the CPU 2 of 21 What is stored in the RAM? Program instructions and data 3 of 21 What does the CPU send (in the fetch stage)? A signal 4 of 21 Where does it send the signal to? Using what bus? To the RAM using the address bus 5 of 21 Where is the instruction sent next? Using what bus? To the CPU using the data bus 6 of 21 Where are the next stages carried out? In the CPU 7 of 21 What parts of the CPU? (2) The CU and the ALU 8 of 21 What stage then starts? The decode stage 9 of 21 What happens during this stage? The instructions are interpreted 10 of 21 What does it mean to decode an instruction? It decides what it means 11 of 21 What part of the CPU decodes the instruction? The control unit 12 of 21 What stage then starts? The execute stage 13 of 21 What happens during this stage? The instructions are carried out 14 of 21 What does it mean to execute an instruction? To carry it out 15 of 21 What part of the CPU executes the instruction? The control unit 16 of 21 What if a calculation need to be performed? It instructs the ALU which carries out the calculation 17 of 21 What is the role of the program counter in the fetch-decode-execute cycle? It holds the memory address of the next instruction to be processed 18 of 21 What is the role of the MDR in the fetch-decode-execute cycle? It holds an instruction or data that has been fetched from the memory before it is used 19 of 21 What is the role of the MAR in the fetch-decode-execute cycle? It holds the address of the memory location currently being read (fetched) or written to 20 of 21 What is the role of the accumulator in the fetch-decode-execute cycle? It stores the results of calculations carried out by the ALU 21 of 21
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