The CPU and the components - page 1 + 2 4.0 / 5 based on 4 ratings ? ComputingComputer systemsCPUGCSEOCR Created by: emj790Created on: 15-01-18 15:23 What does CPU stand for? Central Processing Unit 1 of 32 What does the CPU do? It executes all of the stored program instructions 2 of 32 What does CU stand for? Control unit 3 of 32 What does the control unit do? Controls all the other components of the CPU 4 of 32 What does the CU contain? The decoder 5 of 32 What does the decoder do? It interprets program instructions and tells the ALU what operations to carry out 6 of 32 What does ALU stand for? Arithmetic logic unit 7 of 32 What does the ALU do? It performs arithmetic and logical operations to carry out program instructions 8 of 32 What are buses? Electrical conductors 9 of 32 What do buses do? They carry electrical signals between components in the CPU and other components on the motherboard 10 of 32 What are registers? Memory locations 11 of 32 What do some registers perform in what cycle? Special functions in the fetch-decode-execute cycle 12 of 32 What is cache? Very fast random access memory (RAM) 13 of 32 What does the clock do? Controls the rate at which program instructions are carried out 14 of 32 How does it do this? By sending control electrical signals at regular intervals 15 of 32 What are these regular intervals called? Cycles 16 of 32 How many program instructions are carried out each clock cycle? One 17 of 32 What is clock speed usually measured in? Gigahertz (GHz) 18 of 32 1 GHz is equal to how many cyles per second? 10^9 or 10,000,000,000 19 of 32 What 5 things affect the performance of the computer? Clock speed, Cache size, number of Cores, type of RAM, hard drive speed 20 of 32 Name as many components of the CPU as you can Control unit (with decoder), Cache, Registers (MAR and MDR), Buses, ALU, Clock, Accumulator 21 of 32 What is the name of the CPU design? The von Neumann architecture 22 of 32 What did John von Neumann design? A stored program computer where both program and data are stored in the memory 23 of 32 When was this designed? 1945 24 of 32 What are the components of his design? (4) CPU, program counter, memory, input and output mechanisms 25 of 32 What are some activities that the ALU can carry out? + - / x and comparisons between two different numbers 26 of 32 What does the program counter do? It holds the address of the next instruction to be fetched 27 of 32 What does MDR stand for? Memory data register 28 of 32 What does the MDR do? A temporary store (buffer) for anything copied from memory 29 of 32 What does MAR stand for? Memory address register 30 of 32 What does the MAR do? It holds the address of the memory location currently being read (fetched) or written to 31 of 32 What does the accumulator do? It stores the results of calculations carried out by the ALU 32 of 32
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