Buses
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Buses

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Buses Buses Presentation Transcript

  • bus is a subsystem that transfers databetween components inside acomputer, or between computers.
  • Two type of busesa bus located strictly within a CPU chip forcommunications among the components in aCPU chipInternal bus
  • External Bus
  • • This is the highest-level bus that thechipset uses to send information toand from the processorProcessorBus (SystemBus)• Higher-level architectures, employ adedicated bus for accessing thesystem cacheCache Bus(BacksideBus)• Second-level system bus thatconnects the memory subsystem tothe chipset and the processorMemoryBusBus Hierarchy
  • • For example, video cards, etc• The two most common localI/O buses are the VLB andPCI.The Local I/OBus (High-speedI/O Bus)The illustrationshows how thevarious busesconnect to theCPU.
  • 1-Data and AddressBuses2-BusBandwidth3-Bus Width4-BusWidth4 Characteristics of Bus
  • wide array ofintegratedtechnologies on it, asit has multiple buses(ISA, PCI and AGPto name a few)onboardThe ISA slots are the blackslots on the lower portion ofthe board in the imageStandards Bus Architecture
  • A-IndustryStandardArchitecture(ISA) BusB-MicroChannelArchitecture(MCA) BusC-ExtendedIndustryStandardArchitecture(EISA) BusD-VESALocal Bus(VLB)E-PeripheralComponentInterconnect(PCI) LocalBusBus standardF-Accelerated GraphicsPort (AGP)