文件名称:
USB3.0协议规范(英文完整版).pdf
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文件大小: 4mb
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上传时间: 2020-01-14
详细说明：USB 3.0标准，使用USB3.0时从标准做起。
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.
• Port Expansion
The addition of external peripherals continued to be constrained by port availability. The lack
of a bi-directional, low-cost, low-to-mid speed peripheral bus held back the creative
proliferation of peripherals such as storage devices, answering machines, scanners, PDA’s,
keyboards, mice, etc. Existing interconnects were optimized for one or two point products. As
each new function or capability was added to the PC, a new interface had been defined to
address this need
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