The control unit also dictates how the memory, input output devices, arithmetic logic unit etc. It transfers data throughout the computer as required including from storage unit to central processing unit and vice versa. needed to complete the execution (note: loop) S average number of basic. This unit controls all the other units of the computer system and so is known as its central nervous system. CS 2253 COMPUTER ORGANIZATION AND ARCHITECTURE K. The arithmetic logic unit and the control unit together form the central processing unit. Cs2253-Computer Organisation And Architecture Pen Version notes Unit 2 and 3 CS2253 Computer Organization and Architecture v+ lecture notes. The control unit transfers data from storage unit to arithmetic logic unit when calculations need to be performed. It can perform operations like addition, subtraction, multiplication, division etc. Secondary storage contains a large amount of data permanently.Īll the calculations related to the computer system are performed by the arithmetic logic unit. The data from secondary storage needs to be brought into the primary storage before the CPU can use it. Secondary or external storage is not directly accessible by the CPU. It is traditionally divided into primary storage and secondary storage.Primary storage is also known as the main memory and is the memory directly accessible by the CPU. Storage unit contains many computer components that are used to store data. The different output devices are monitors, printers, speakers, headphones etc. EC8552 CAO Notes Anna University Regulation 2017 ECE EC8552 CAO Notes, COMPUTER ARCHITECTURE AND ORGANIZATION Lecture Handwritten Notes for all 5 units are provided below. Most of the output data is the form of audio or video. The output unit provides the results of computer process to the users i.e it links the computer with the external environment. are the most commonly used input devices.
It takes data from the input devices, converts it into machine language and then loads it into the computer system. So, basically it links the external environment with the computer. CS1252 COMPUTER ORGANIZATION AND ARCHITECTURE (Common to CSE and IT) L T P C 3 1 0 4 UNIT I BASIC STRUCTURE OF COMPUTERS 9 Functional units Basic. The input unit provides data to the computer system from the outside. The control unit controls all the other units as well as their data.ĭetails about all the computer units are − This is because stored data is computed on before being stored again. The data constantly moves from storage unit to ALU and back again. Similarly, the computed data travels from ALU to output unit. The input data travels from input unit to ALU. It should maximize performance and reduce costs as well as power consumption.The different components in the Computer System Architecture are Input Unit, Output Unit, Storage Unit, Arithmetic Logic Unit, Control Unit etc.Ī diagram that shows the flow of data between these units is as follows −
A computer system is basically a machine that simplifies complicated tasks.