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 2K124K138K1416KAddressable memory in bytes/address bus size7Data Handshaking LinesData Handshaking LineszCritical for the flow of orderly datazBasic Handshaking consists of two lines:-Sending identification line-Receiving identification line8Control LinesControl Lines Memory write Memory read I/O write I/O read Transfer ACK Bus request Bus grant Interrupt request Interrupt ACK Clock ResetzControls the access to the data and address lineszControls the use of the data and address lineszTypical control lines inclu

Parallel Serial Parallel Serial S-100 I2C ATA ACCESS BUS ISA SPI IEEE-488 ADB EISA Hiper Transport HIPPI Fibre Channel MCA PCI-EXPRESS PCMCIA IEEE-1394 NUBUS SCSI RS-422 & RS-485 SBUS Serial ATA PCI SSA VME USB …

  Serial, Structure, Bus structures