文件名称:
USB in a Nutshell(USB概述)
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文件大小: 175kb
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上传时间: 2007-08-10
详细说明： USB in a Nutshell(USB概述)
Making Sense of the USB Standard
Starting out new with USB can be quite daunting. With the USB 2.0 specification at 650 pages one could easily be
put off just by the sheer size of the standard. This i s only the beginning of a long list of associated standards for
USB. There are USB Class Standards such as the HID Class Specification which details the common operation of
devices (keyboards, mice etc) falling under the HID (Human Interface Devices) Class - only another 97 pages. If
you are designing a USB Host, then you have three Host Controller Interface Standards to choose from. None of
these are detailed in the USB 2.0 Spec.
The good news is you don’t even need to bother reading the entire USB standard. Some chapters were churned
out by marketing, others aimed at the lower link layer normally taken care off by your USB controller IC and a
couple aimed at host and hub developers. Lets take a little journey through the various chapters of the USB 2.0
specification and briefly introduce the key points.
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