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 determines maximum memory capacity of system 8080 has 16 bit address bus giving 64k address spaceAddress Bus Size Addressable memory (bytes)122438416532664712882569512101K11 2K124K138K1416KAddress

Computer Bus Structures Ramin Roosta. 2 Introduction zConcept of the basic bus zDescription of available Internal bus Systems zDescription of available External bus systems. 3 ... – In this state a unit can take control of the bus and become an initiator. 28 SCSI Bus Phases (cont’d)

  Control, Structure, Bus structures