USB 2.0 revision 2.0
usb2.0全攻略
支持热插拔技术和高级即插即用功能，这样用户可以方便的在计算机上添加外设，而且USB接口不使用IRQ的中断控制以及输入输出的地址资源，最多可以连结127个设备。
另外USB接口最大的优点就是速度快，尤其是运用在打印机、扫描仪等设备上，它可以显著提高用户的工作效率。
随着全新的USB 2.0规范诞生，输入/输出的带宽得到了显著扩展，从而会进一步刺激USB外设的发展。
那么USB2.0技术规范有些什么特点，能给我们带来哪些好处呢？鉴于目前USB 2.0插卡和外围设备大量涌现，我们有必要让大家对USB 2.0有一个全面的了解。
什么是USB 2.0USB 2.0（通用串行总线）是一种计算机外设连接规范，由PC业的一系列龙头老大联合制订，包括康柏、惠普、英特尔、Lucent、微软、NEC和Philips。
USB2.0在现行的USB1.1规格上增加了高速数据传输模式。
在USB2.0中，除了USB1.1中规定的1.5Mbit/s和12Mbit/s两个模式以外，还增加了480Mbit/s （60MB/s）这一“高速”模式。
由于增加了高速模式，将会使USB的应用范围得到进一步扩大。
由于总线的整体传输速度提高，即使同时使用多个设备也不会导致各设备的传输速度减慢。
要实现USB2.0需要得到硬件和软件双方的支持。
除了电脑中安装的Host Controller等设备以及内置于集线器的控制芯片需要支持2.0版本外，另外还要在操作系统中安装驱动软件。
USB2.0可以使用原来USB定义中同样规格的电缆，接头的规格也完全相同，在高速的前提下一样保持了USB 1.1的优秀特色，并且，USB 2.0的设备不会和USB 1.X设备在共同使用的时候发生任何冲突。
但是数据处理上则有快有慢，将一个USB 2.0规格的外设与一台只有USB 1.1规格的电脑相连，其结果只能让该设备运行于USB 1.1模式下，传输速率也只能降低到12Mbps。
目前来说，我们常见的系统有三种不同的芯片来支持USB 2.0接口：来自威盛（VIA）的VT6202和NEC 的D720100AGM两款芯片是专门为支持USB 2.0设备而设计的芯片产品，多用于集成在主板上，也被单独制作成USB 2.0控制卡，供早期电脑使用；而来自Intel的FW82801DB芯片则是一款多用途ICH4芯片，配合Intel的i845E、i845G、i845PE、i845GE等芯片组使用。
USB OTG and EH 2-0规范
INTELLECTUAL PROPERTY DISCLAIMER THIS SPECIFICATION IS PROVIDED TO YOU “AS IS” WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE. THE AUTHORS OF THIS SPECIFICATION DISCLAIM ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE OR IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. THE PROVISION OF THIS SPECIFICATION TO YOU DOES NOT PROVIDE YOU WITH ANY LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS.
1.2
April 4, 2006
1.3
December 5, 2006
ห้องสมุดไป่ตู้
2.0
May 8, 2009
Universal Serial Bus Specification Supplement Copyright © 2008, LSI Corporation, Hewlet-Packard Company, Intel Corporation, Microsoft Corporation, NEC Corporation, ST-NXP Wireless Company. All rights reserved
USB 2.0 ECN VBUS Max Limit
USB ENGINEERING CHANGE NOTICETitle: USB 2.0 VBUS Max LimitApplies to: Universal Serial Bus Specification, Revision 2.0Summary of ECNUpdate the USB2.0 specification to align with the expanded VBUS voltage definition in the USB-IF Type-C specification which defines VBUS as having a Max supply voltage of 5.50 V DC.The Type-C cable and connector definition specifies a minimal current carrying capacity of 3A. This increased capacity creates a situation where losses in cables, connectors, PCB traces and power supply components will result in the VBUS level available at the consumer end of the cable that is below the minimum acceptable level for operation. As a result, in order to have an implementable Type-C specification it is necessary to boost the upper limit for VBUS at the supply side to 5.5V DC from the present spec value of 5.25 V DC.Reasons for ECNOEM’s can design products that support the higher power levels of the Type-C connector and provide VBUS levels at or above 5.25V to ensure that the VBUS voltage that is available at the far-side connection is within a suitable working range for USB products, and is also at a high enough level to charge batteries in as short a time interval as possible to ensure customer satisfaction.Impact on Existing Peripherals and Systems:The impact is difficult to assess as there is a wide range of component vendors supporting USB, and also a wide variation of design methodologies.As a result, there are certainly going to be a subset of existing USB products that may be sensitive to operation at VBUS levels of up to 5.5V. The sensitivity will be mitigated in many cases by cable losses, so the devices themselves may never experience the 5.5V.Hardware Implications:New designs adhering to this ECN will need to consider the new 5.5V VBUS max level during the component selection process.Software Implications:There are no known software implications.Compliance Testing Implications:Compliance will need to make the small modifications necessary to accommodate the new upper limit.Specification Changes(a) S ection 7.1.1 USB Driver CharacteristicsFrom Text:Short Circuit WithstandA USB transceiver is required to withstand a continuous short circuit of D+ and/or D- to V BUS, GND, other data line, or the cable shield at the connector, for a minimum of 24 hours without degradation. It is recommended that transceivers be designed so as to withstand such short circuits indefinitely. The device must not be damaged under this short circuit condition when transmitting 50% of the time and receiving 50% of the time (in all supported speeds). The transmit phase consists of a symmetrical signal that toggles between drive high and drive low. This requirement must be met for max value of V BUS (5.25 V).It is recommended that these AC and short circuit stresses be used as qualification criteria against which the long-term reliability of each device is evaluated.To Text:Short Circuit WithstandA USB transceiver is required to withstand a continuous short circuit of D+ and/or D- to V BUS, GND, other data line, or the cable shield at the connector, for a minimum of 24 hours without degradation. It is recommended that transceivers be designed so as to withstand such short circuits indefinitely. The device must not be damaged under this short circuit condition when transmitting 50% of the time and receiving 50% of the time (in all supported speeds). The transmit phase consists of a symmetrical signal that toggles between drive high and drive low. This requirement must be met for max value of V BUS (5.50 V).It is recommended that these AC and short circuit stresses be used as qualification criteria against which the long-term reliability of each device is evaluated.(b) S ection 7.2.2 Voltage Drop BudgetFrom Text:The voltage drop budget is determined from the following:•The voltage supplied by high-powered hub ports is 4.75 V to 5.25 V.•The voltage supplied by low-powered hub ports is 4.4 V to 5.25 V.•Bus-powered hubs can have a maximum drop of 350 mV from their cable plug (where they attach to a source of power) to their output port connectors (where they supply power).•The maximum voltage drop (for detachable cables) between the A-series plug and B-series plug on VBUS is 125 mV (VBUSD).•The maximum voltage drop for all cables between upstream and downstream on GND is 125 mV (VGNDD).•All hubs and functions must be able to provide configuration information with as little as 4.40 V at the connector end of their upstream cables. Only low-power functions need to be operational with this minimum voltage.•Functions drawing more than one unit load must operate with a 4.75 V minimum input voltage at the connector end of their upstream cables.To Text:The voltage drop budget is determined from the following:•The voltage supplied by high-powered hub ports is 4.75 V to 5.50 V.•The voltage supplied by low-powered hub ports is 4.4 V to 5.50 V.•Bus-powered hubs can have a maximum drop of 350 mV from their cable plug (where they attach to a source of power) to their output port connectors (where they supply power).•The maximum voltage drop (for detachable cables) between the A-series plug and B-series plug on VBUS is 125 mV (VBUSD).•The maximum voltage drop for all cables between upstream and downstream on GND is 125 mV (VGNDD).•All hubs and functions must be able to provide configuration information with as little as 4.40 V at the connector end of their upstream cables. Only low-power functions need to be operational with this minimum voltage.•Functions drawing more than one unit load must operate with a 4.75 V minimum input voltage at the connector end of their upstream cables.c) Section 7.3.2 Bus Timing/Electrical Characteristics From Text/Table:Table 7-1. DC Electrical CharacteristicsTo Text/Table:Table 7-2. DC Electrical Characteristics。
USB1.1、USB2.0及USB3.0的区别
USB 2.0 Host
Email:cycloneriver@USB HOST 开发之我见由于usb的简便易用因而大量嵌入式设备开始使用usb，但是usb的开发并不是一帆风顺十分简单。
相反usb的开发是一件十分烦杂的事情，目前usb 的开发正如火如荼，但大多涉及的都是Device端的开发，基于Host的开发少之又少，究其原因就是因为开发难度太大，可用资源太少很多公司刚开始时雄心勃勃，可后来却偃旗息鼓，最后不得不放弃。
本人做usb开发已有两年之余，幸运的是一开始接触的就是usb host端的开发，而且还成功了，本人的项目主要是使用usb host进行硬盘备份，本人的两个项目均在VxWorks下实现，第一个项目使用ISP1161，第二个项目使用ISP1561，为了不至于让我的工作成果湮没，本人愿意在收取一定费用的情况下将它共享出来。
本人提供的是c语言源代码，移植起来十分方便，因而我觉得它还是有一点价值的。
本人联系方式cycloneriver@一并贴上对本开发十分有用的一个文档嵌入式vxworks usb2.0主机软件设计文档Email:cycloneriver@Universal Serial Bus Revision 2.0(usb2.0)提供了一个通用的通道可以完成从低速到高速的通讯。
目前支持3种传输速度低速(1.5Mbps)，全速（12Mbps），高速（480Mbps）和4种数据传输类型1.控制传输2.块传输3.同步传输4.中断传输而且USB2.0综合支持电源管理和设备的即插即用我们可以设计出各种不同类的usb设备，各类设备需要他自己的设备驱动支持，而且他们之间互相独立1.环境软件环境：Tornado2.2 for ppcVxWorks5.5硬件环境：ppc405ep评估板第二板usb芯片: Isp1561 support EHCI and OHCI设计注意:由于usb 芯片内部以little_endian方式组织,CPU PowerPC系列以big_endian方式操作.所以对usb内部register的读取时,一定要进行endian 转换!B2.0结构usb软件包括设备驱动软件USBDD，USB总线驱动(USBD)，主控器驱动(HCD)设备驱动软件：支持某个特定设备或设备类的设备驱动，负责直接与对应的usb设备进行通信和读写控制，USB总线驱动：提供了对USB设备的抽象，负责上层软件对与usb设备间的数据传输。
USB 2 0
特点
（1）速度快：接口的传输速度高达480 Mbit／s，完全能满足高速数据交换的要求； （2）连接简单快捷：所有的 USB设备利用通用的连接器，无需打开主机机箱就可简单方便地连人计算 机，实现热拔插； （3）无需外接电源：USB电源向低压设备提供 5V电源； （4）有不同的带宽和连接距离：USB 2．0提供全速与高速 2种传输数率规格，使用户有足够的带宽供新 的外设使用； （5）良好的兼容性：系统检测到 1．1版本的接口类型时，会自动按照 12 Mbit／s的速度传输，而其他采 用 2．0版本的外设还是能以2．0所规定的速率传输。
2000年制定的USB 2.0标准是真正的USB 2.0，被称为USB 2.0的高速（High-speed）版本，理论传输速度 为480 Mbps，即60 MB/s，但实际传输速度一般不超过30 MB/s，采用这种标准的USB设备也比较多。
支持ห้องสมุดไป่ตู้统
USB接口定义Microsoft Windows 98 SE Microsoft Windows Me Microsoft Windows 2000（确保已安装Service Pack 4） Microsoft Windows XP Microsoft windows Vista Microsoft Windows 7 Microsoft Windows 8 Microsoft Windows Server 2003/2008/2008 R2/2012/2012 R2/2016 Microsoft Windows 10 Mac OS X Linux内核的各版本各品牌系统
规范
注意：本文所说的Mbps乃是“兆位每秒”，并不是我们日常用的“兆字节每秒”。一字节等于八位。
这里有必要先说清楚一下USB2.0规范的由来。USB2.0技术规范是有由Compaq、Hewlett Packard、Intel、 Lucent、Microsoft、NEC、Philips共同制定、发布的，规范把外设数据传输速度提高到了480Mbps，是USB 1.1设备的40倍！但按照原定计划新的USB 2.0标准只是准备把这个标准定在240Mbps，后来，经过努力将它提高 到了480Mbps。
解读USBIF电池充电规范
解读USBIF电池充电规范背景2009年4月，全球移动通信系统协会(GSMA)联合OTMP(手机开放组织联盟)17家移动运营商和制造商宣布实施跨行业的通用充电器标准，此标准采纳了USB-IF的micro-USB接口作为手机数据和充电的统一接口，并采纳USB-IF的Battery Charging 规范作为充电规范。
USB-IF公布了1.1版的Battery charging规范(以下简称为BC规范)，比起两年前公布的1. 0版本，这个新版本有了较大更新和补充。
同时，与之配套的测试规范也正在制定中，预计将在年内颁布和实施。
届时USB Battery Charging相关测试项目将纳入到USB兼容测试认证中。
电池充电规范原有USB2.0规范并没有考虑到使用USB接口为便携式设备的电池进行充电的需求，而这样的需求却越来越多。
BC规范要解决的就是这个问题，符合规范的设备和系统即向下兼容USB2.0标准，又针对充电做出了特别的优化。
实际上，BC规范的核心内容就是引入了充电端口识别机制。
一个符合BC规范的便携式USB设备或OTG设备通过这套机制可以识别出是插到了一个标准的USB下行接口(Standard Downstream Port );一个USB专用充电器(USB Charger);还是一个针对充电做过优化的USB 下行接口(Charging Downstream Port)。
然后，这些设备将根据不同的情况，按照BC规范的要求来获取不同的电流。
便携式设备和三种USB充电接口● Portable DevicePortable Device(以下简称PD)指电池供电的便携式USB外设或者OTG设备，可以通过USB接口来为自身的电池充电。
BC规范建议这些的PD应该具备相应的端口识别能力和对从USB总线获取电流的控制能力。
● Standard Downstream Port基本上，这个Standard Downstream Port指符合现有USB2.0规范的主机(HOST)或集线器(HUB)上的下行USB接口。
USB2.0与OTG规范及开发指南(全中文)(1)
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Company Foxconn Electronics – CCWG Chair Foxconn Electronics Foxconn Electronics Contech Research – Co-Editor ATL Technology – CCWG Scribe Acon Acon ELKA International Ltd. ETC (Electronic Test Center, Taiwan) FCI Foxlink International, Inc. Foxlink International, Inc. Fujikura Ltd Fujikura Ltd Fujikura Ltd Fujikura Ltd Fujikura Ltd Fujikura Ltd Hirose Electric Co. Ltd Hirose Electric Co. Ltd Hirose Electric Co. Ltd Hirose Electric Co. Ltd Hirose Electric Co. Ltd Honda Connectors Hosiden Hosiden Japan Aviation Electronics, Inc Japan Aviation Electronics, Inc Japan Aviation Electronics, Inc JST Mfg. Co. Ltd JST Mfg. Co. Ltd
CabConn Rev 2.0 CabConn Rev 2.0 CabConn Rev 2.0 CabConnRC2_02-06-07 CabConnRC2_12-06-06 CabConnRC2_7-11-06
2.0RC2
June 7, 2006
CabConnRC2_6-7-06
2.0RC2 2.0RC2 2.0RC1 2.0RC
August 2007
iii
Cables and Connectors Class Document
Revision 2.0
Contributors
Name James R. Koser Tsuneki Watanabe Jim Zhao George G. Olear II Jaremy Flake Glen Chandler George Yee Roy Ting Sophia Liu Bill Northey Jack Lu Wen Yang Yasuhiro Ishii Shigreu Ashida Marksuk Piyavit Hiromichi Kato Sathid Inthon Makoto Kikuchi Hiroshi Nakazawa Yousuke Takeuchi Shinya Tono Karl Kwiat Kazunori Ichikawa Toshi Sasaki Jim Eilers Tsuyoshi Kitagawa David Suryoutomo Ron Muir Kazuhiro Saito
E-mail Address jim.koser@ t.watanabe@ Jim.zhao@ ggo@ jaremyf@ glenc@ George.Yee@ roy@ scl@.tw William.northey@ Jack_lu@ wen@ Yishii@fujikura.co.jp Ashidas@fujikura.co.jp MPiyavit @ pakl@ isathid @ mkikuchi@fujikura.co.jp Hiroshi Nakazawa@hirose.co.jp Yousuke_Takeuchi@hirose.co.jp Shinya_tohno@hirose.co.jp kkwiat@ Kazunori_Ichikawa@hirose.co.jp t.sasaki@honda-connectors.co.jp eilersjm@ kitagawat@ suryoutomod@ muirr@ saitouk@jae.co.jp tdeguchi@ ymiya@
March 24, 2006 December 03,2003 October 29, 2002 August 13, 2002
CabConnRC2_3-23-06.doc CabConnRC2.doc CabConnRC1.doc
1.1 1.0 1.0RC 0.9a
September 1, 1999 May 22, 1999 March 27, 1999 January 19, 1999
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INTELLECTUAL PROPERTY DISCLAIMER
THIS SPECIFICATION IS PROVIDED TO YOU “AS IS” WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE. THE AUTHORS OF THIS SPECIFICATION DISCLAIM ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE OR IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. THE PROVISION OF THIS SPECIFICATION TO YOU DOES NOT PROVIDE YOU WITH ANY LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS.
2.0 RC5
June 5, 2007
CabConn20RC5_June5
2.0 RC4 2.0
May, 2007 April 4, 2007
CabConn20RC4_May07 CabConn20
2.0 2.0 2.0 2.02RC2 2.01RC2 2.0RC2
February 14, 2007 February 13, 2007 February 7, 2007 February 6, 2007 December 6, 2006 July 11, 2006
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USB Cables and Connectors Class Document © Copyright 2007, USB Implementers Forum All rights reserved.
Adds Addenda content Adds additional Application Specific USB Product Specification content. Supersedes segments of Chapter 6 Revision 1.1 Release Candidate 1.0c.
Universal Serial Bus Cables and Connectors Class Document
Revision 2.0 August 2007
Cables and Connectors Class Document
Revision 2.0
Revision History
Rev 2.0 RC 6 Date August 10, 2007 Filename CabConnRC6_Aug10.doc Comments Added Go/No-go & latch measurement for Micro series Added Drain wire inspection process Added pin contact visual inspection Added clarifying text to 4-axis test description Removed Shielding Effectiveness Replace Rotational Continuity with 4-Axis continuity Other miscellaneous minor changes Cable Construction inspection added Removed Shielding Effectiveness, Added power line resistance test Added cable rotation test Edits from Tsuyoshi YAMANE of Matsushita Edited by Jim Koser new chart from Hirose Edited draft Work group editorials Work group editorials Added durability requirements for Ruggedized Standard “A” receptacle and durability requirements for Micro series Added new critical dimensions drawings for standard “A” and “B” plugs and receptacles and changed the criteria for “mini” products to the use of go – no go gages in Appendix B Added new IP agreement Final edit during USB DWG meeting in Austin prior to posting the document to Web site Adjust formatting in technical edit pass Rewrite of test program to reflect current practice and general updates to reflect changes in the USB Specification. Editorial Update for improved use. Add Appendices ‘A’ and ‘B.’ Accepted unanimously by USB-IF DWG after 30-day posting without negative comment. Release for industry comment Moved to Revision 0.9 by consensus of the Cable & Connector Work Group. Pending final editorial cleanup RRs to be voted on at a special Cable & Connector Work Group meeting February 21, 1999. Moves Document to 0.9RC by consensus of the Cable & Connector Group to Version 0.9 without Appendices Drawings and Lab Listings. Special dispensation by the DWG to move to Revision 1.0 for use at the January 1999 Plug Fest. Release for industry comment