Transcription of Computer Bus Structures
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Computer Bus Structures
1 Computer Bus StructuresComputer Bus StructuresRamin Roosta2 IntroductionIntroductionzConcept of the basic buszDescription of available Internal bus SystemszDescription of available External bus systems3 Basic BusBasic BuszData buszAddress buszHandshaking lineszControl lines4 Data 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 transfer6 Address 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 2K124K138K1416 KAddressable memory in bytes/address bus size7 Data Handshaking LinesData Handshaking LineszCritical for the flow of orderly datazBasic Handshaking consists of two lines:-Sending identification line-Receiving identification line8 Control LinesControl Lines Memory write Memory read I/O write I/O read Transfer ACK Bus request Bus grant Interrupt request Interrupt ACK Clock ResetzC
Address Bus ze.g. CPU needs to read an instruction (data) from a given location in memory zIdentify the source or destination of data zBus width determines maximum memory capacity of system – e.g. 8080 has 16 bit address bus giving 64k address space Address Bus Size Addressable memory (bytes) 12 24 38 416 532 664 7128 8256 9512 10 1K 11 2K 12 ...
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