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Because the enumeration process is continuous, the USBalso allows the user to add or remove devices without powering down the system, a process called “hot swapping.”

Universal Serial Bus - 54730 HostDevice

enumeration
Host identifies deviceis attachedHost assigns uniqueaddress to deviceHost issues configurationto be used by deviceHost loads new firmwarefrom S/W fileHost begins“enumeration” againHost verifies newresources availableHost issues configurationto be used Device provides initialdevice descriptors Device disconnectsand reconnectsDevice provides updatedinformation to host renumeration Identifying and assigningan address to peripherals is accomplished through a process called enumera- tion. Enumeration identifieseach device and assigns it a unique address for commu- nication with the host.
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