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【文件名】:091122@52RD_USB in a Nutshell.pdf
【格 式】:pdf
【大 小】:305K
【简 介】:
【目 录】:
USB最好的入门书，USB感兴趣者必看！
The good news is you dont 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.
Chapter Name Description Pages
1 Introduction Includes the motivation and scope for USB. The most important piece 2
of information in this chapter is to make reference to the Universal
Serial Bus Device Class Specifications. No need reading this chapter.
2 Terms and This chapter is self-explanatory and a necessary evil to any standard. 8
Abbreviations
3 Background Specifies the goals of USB which are Plug¡¯n¡¯Play and simplicity to the 4
end user (not developer). Introduces Low, Full and High Speed ranges
with a feature list straight from marketing. No need reading this chapter
either.
4 Architectural This is where you can start reading. This chapter provides a basic 10
Overview overview of a USB system including topology, data rates, data flow
types, basic electrical specs etc.
5 USB Data Flow This chapter starts to talk about how data flows on a Universal Serial 60
Model Bus. It introduces terms such as endpoints and pipes then spends
most of the chapter on each of the data flow types (Control, Interrupt,
Isochronous and Bulk). While it¡¯s important to know each transfer type
and its properties it is a little heavy on for a first reader.
6 Mechanical This chapter details the USB¡¯s two standard connectors.
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发表于 2009-11-22 18:59:36
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