Usb Presentation

USB (Universal Serial jitney) Presentation to UCHUG - 2/06/08 G. Skalka What is USB? Universal Serial four-in-hand A computer peripheral interface Ubiquitous crossways all computer platforms Several variations - continues to evolve Hot-swapable Provides three advantages look expansion Performance Standard connection method In the grey-haired Days . . . Mice and keyboards only connected to dedicated connectors or resultant bearinghole Networking (as such) was only through serial com port Printers had their give birth connector Not much else!  veritable(prenominal) Performance USB provides much higher(prenominal) selective information transfer speeds, with less wires! Birth of USB Defined by Intel and other industry leadership in early mid-nineties Ease of use was primary goal Four-wire interface Point-to-point, emcee-target architecture Bus expansion knock back legacy connectors USB Connectors USB Cables Four wir es (+5V, Return, data twisted pair) Up to 5 m (16.

4 ft) Longer connections use hubs or busy extensions Active extension incorporates a bus major provide hub USB Details army initiates all transfers Target can be dumb ternion device types host controllers Hubs Functions (Peripherals) Accommodates 7 tiers 5 hub levels, 127 devices Physical link is a tiered-star topography Host Controller moreover one host in any USB system typically implemented in PC chipset (root hub) Host responsibilities Detect attachments and removals repugn control and data flow between host and devices monitoring device status and activity Provide power to attach! ed devices course of instruction drivers included in most in operation(p) systems Hubs Combined divider and repeater mustiness detect connections and disconnections downstream and report to host must manage downstream power Bus-powered hubs (Power from upriver) Must deal no more than 500 mA from upstream Must supply 100 mA to each downstream port Self-powered hubs (External power source) May...If you want to get a full essay, social club it on our website: BestEssayCheap.com

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