USB 3.0规范协议-(完整版)

The original moTIvaTIon for the Universal Serial Bus (USB) came from several consideraTIons, two of the most important being:

• Ease-of-use

The lack of flexibility in reconfiguring the PC had been acknowledged as the Achilles’ heel to

its further deployment. The combinaTIon of user-friendly graphical interfaces and the hardware

and software mechanisms associated with new-generation bus architectures have made

computers less confrontational and easier to reconfigure. However, from the end user’s point

of view, the PC’s I/O interfaces, such as serial/parallel ports, keyboard/mouse/joystick

interfaces, etc., did not have the attributes of plug-and-play.