Hurry away! You expect USB2.0 protocol Chinese version released it!

USB2.0 full text of the agreement a total of 650 in Chapter 11, the full text in English. Jungle for the first time to get the agreement of 650 not start. Chapter 6,7,8 simply looked abandoned after the first (USB Starter does not recommend watching USB2.0 protocol). After seeing "Circle teach you to play USB", and the practice part of the company's USB-related projects, and then fell back to see the USB protocol, just to understand some meaning.

Look USB2.0 protocol again, Jungle Chinese version based on personal understanding and combined with some supporting information, finishing USB2.0 protocol. In fact, USB protocol does not need to completely read. The frame protocol, physical, electrical, and protocol HUB divided different sections, depending on the desired person can go to access the corresponding portion. Otherwise it will be a waste of time, less effective.

Chapter Organization

Chinese version is divided into five chapters, a total of 55 pages, each chapter is organized as follows:

Chinese Version	content
1 Introduction	Corresponding to the original Chapter 4, Introduction to USB topology,
2. Data Flow Model	Corresponding to the original Chapter 5 introduces USB communication model and transmission type view
3. The physical specifications and electrical specifications	Chapters 6 and the corresponding precursor VII describes the physical specifications and electrical specifications
4.USB communication protocol	Chapter 8 corresponds to the original, introduced USB package, domains, and affairs
5.USB device framework	9 corresponds to the original chapter describes USB device enumeration, descriptors and standard requests, etc.

Chapter 10 and Chapter 11 of the agreement, about Host and Hub, and there is no longer devoted.

brief introduction

Chinese version of the main content or reference USB2.0 protocol, but not word for word translation of the original text, but omitted a lot of content. Jungle believe that these matters will be omitted does not affect the entry of USB, learning and understanding. In contrast, the streamlined version of the Chinese people more easily understand and absorb. Moreover, Jungle in agreement on the basis of some rich content. Such transmission control, generally known in three different stages (control phase, status phase and a data phase), and each stage is divided into what token packet, the data packets and status packets and the like. In addition to explain these concepts, Jungle also used as the example of FIG, enhance understanding of the control transfer:

Of course, as described above, the Chinese version omitted chapters, such as on Hub, detailed physical specifications and signal definitions. This part may be self-reference USB2.0 protocol.

USB learning materials

About USB learning much more than to see the USB protocol, Jungle is also currently in the process of study and practice. Recommended learning materials:

1. "Circle teach you to play USB", edited by Dennis : holding a development board, a routine practice in front of the book, have much to gain;

USB in A Nutshell 2. : simplify USB protocol, how to simplify it? Only 37! It can be said is the essence of the whole. Content may still be too simple, so electrical specifications are not, but for understanding the agreement is enough!

3. USB2.0 protocol : after all, can not do without, because of this the most complete and most authoritative

4. online information .

5. https://www.usb.org/

6. Of course, see this blog, the addition of a choice, is the Jungle sort of Chinese version!