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Computer Organization, Bus Structure

Computer Organization, Bus Structure. popo. Computer Organization, Bus Structure. Bus Structure A communication pathway connecting two or more devices When a word of data is transferred between units all its bits are transferred in parallel

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Computer Organization, Bus Structure

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  1. Computer Organization, Bus Structure popo

  2. Computer Organization, Bus Structure • Bus Structure • A communication pathway connecting two or more devices • When a word of data is transferred between units all its bits are transferred in parallel • ie. The bits are transferred simultaneously over many lines, one bit per line. • A group of lines that serves as a connecting path for several devices is called a bus • A group of lines connected to different devices is called bus. •  Bus can carry data and control signals •  Single bus – simple way to interconnect functional units. popo

  3. Computer Organization, Bus Structure • Single Bus Structure popo

  4. Computer Organization, Bus Structure • All units are connected to this bus • Bus can used only for one transfer at a time • So only 2 units can actively use the bus at any given time. • Only one device at a time can successfully transmit. • Single bus – low cost and It is flexible for attaching diff devices • By using multiple bus simultaneously can transfer more than one data at a time • This leads to increase the performance of the system. • So the bus can carry several data at a time in parallel such as • Power • Instructions • Data • Addresses • Commands popo

  5. Computer Organization, Bus Structure • Multiple-Bus Organization • The following Figure shows a three-bus structure. • All registers are combined into a single block called register file with three ports: 2 outputs allowing 2 registers to be accessed simultaneously. • Buses A and B are used to transfer source operands to the A and B inputs of ALU, and result transferred to destination over bus C. popo

  6. Computer Organization, Bus Structure popo

  7. Computer Organization, Bus Structure • Diff units in a system having diff speed • Keyboard • Printer are relatively slow • some units are very fast all these devices communicate with each other over the same bus • in order to communicate all types of units smoothly include buffer registers with the devices to hold the data during transfer. • eg transfer of data between processor and printer • Processor sent data over the bus to printer buffer • Once the buffer is loaded the printer can start printing With out the interaction of the processor • The bus and processor are now free to do another work. popo

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