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  1. 1. bus is a subsystem that transfers databetween components inside acomputer, or between computers.
  2. 2. Two type of busesa bus located strictly within a CPU chip forcommunications among the components in aCPU chipInternal bus
  3. 3. External Bus
  4. 4. • 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
  5. 5. • 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.
  6. 6. 1-Data and AddressBuses2-BusBandwidth3-Bus Width4-BusWidth4 Characteristics of Bus
  7. 7. 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
  8. 8. A-IndustryStandardArchitecture(ISA) BusB-MicroChannelArchitecture(MCA) BusC-ExtendedIndustryStandardArchitecture(EISA) BusD-VESALocal Bus(VLB)E-PeripheralComponentInterconnect(PCI) LocalBusBus standardF-Accelerated GraphicsPort (AGP)