Bus

Bus

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  • What isbus? • Function of buses • Types of bus. • What is Internal bus? • Classification of Internal bus • What is External bus? • Common characteristics. CONTENT:
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  WHAT IS BUS? o All the parts of the computer are connected with many types of cable. o These types of cable are known as BUS. o Bus is a communication channel. o Limitation is only one transmission at a time.
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  FUNCTIONS OF BUSESIN COMPUTERS: • 1. Data sharing - All types of buses found in a computer transfer data between the computer peripherals connected to it. • 2. Addressing - A bus has address lines, which match those of the processor. This allows data to be sent to or from specific memory locations. • 3. Power - A bus supplies power to various peripherals connected to it.
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  BUS Internal BUS Data BUS Address BUS Control BUS External BUS
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  WHAT IS INTERNALBUS ? Connects all the internal components of the computer, such as CPU and memory, to the motherboard. Can carry data, memory address, control information and any other internal communication or processes.  Also known as an Internal data BUS, Local BUS and Frontside BUS(FSB).
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  DATA BUS: oConsist ofset of wires, provides transportation of data. oUse to carry binary sequence. oThese lines are bidirectional. oWe can determine the word length of processor, and performance of the processor.
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  CONTROL BUS: • Usedto carry the control signals and timing signals. • Indicates the type of operation i.e. read and write. • These lines are also bidirectional. .The physical connections that carry control information between the CPU and other devices within the computer.
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  • These linesare used to carry the address towards the memory and i/o. • Address lines are unidirectional. • Based on the address lines we can determine the size of the memory. ADDRESS BUS:
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   If wehave 16 address lines the size of the memory : 2^16= 64 KB  If we have 20 address lines the size of the memory: 2^20=1 MB
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  • The Internalbus connected with the external bus and synthesis the all parts of mother board. • Different types of USB cables are external bus. EXTERNAL BUS:
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  Common Characteristics • Multipledevices communicating over a single set of wires • Each line or wire of a bus can at any one time contain a single binary digit. Over time, however, a sequence of binary digits may be transferred • These lines may and often do send information in parallel • A computer system may contain a number of different buses