Computer Bus Structures
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
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