文件名称：java开发usb实例
文件大小：906KB
文件格式：RAR
更新时间：2016-07-18 04:38:13
JAVA USB
java开发usb实例 1Preface 1.1Introduction JSR80istheJavaSpecificationRequestconcernedwithcommunicationwithUniversalSerialBus(USB) devices.ThisdocumentdescribestheAPIassociatedwiththisJSR. 2USBBusTopology ThestructureoftheUSBbusistopological.TherootoftheUSBphysicalbusisaphysicalHostCon- troller,whichiscontainedinacomputersystem.HostControllersareusuallyon-boardormaybeadd-in PCIcards.Theyappearlogicallyashubs,sotheyaretheroothubintheirowntopologytree.Connected tothemareoneormoreUSBdevices,andsinceUSBhubsareatypeofUSBdevice,thistopologymay continuedownuntiltherearenomoreconnecteddevices.Thenon-hubdevicesformtheleavesofthe topologytree,whilethehub-typedevicesformthebranchesofthetopologytree.Thisformsthephysical devicetopology.
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