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Computer Bus Structures

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1Computer Bus StructuresComputer Bus StructuresRamin Roosta2IntroductionIntroductionzConcept of the basic buszDescription of available Internal bus SystemszDescription of available External bus systems3Basic BusBasic BuszData buszAddress buszHandshaking lineszControl lines4Data BusData BuszFunction of a data bus is to send data from one device to anotherzData is passed in parallel or serial manner Parallel will normally pass in a multiple of 8-bits at a time Serial passes one bit at a time5zParallel data bus is fasterzParallel data bus requires an extra handshaking line to synchronize the data transfer6Address BusAddress CPU needs to read an instruction (data) from a given location in memoryzIdentify the source or destination of datazBus width

31 SCSI Bus (cont’d) zStatus Phase – The target sends a single status byte asynchronously zMessage In Phase – The last information that is transferred in the connection is typically the Command Complete message zBack to Bus Free Phase

  Structure, Bus structures

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