Universal Serial Bus Revision 2.0 specification (.zip file format, size 9.80 MB) provides the technical details to understand USB requirements and design USB compatible products. Modifications to the USB specification are made through Engineering Change Notices (ECNs). Enclosed in this zip file are the following documents:

  1. The Original USB 2.0 specification released on April 27, 2000
  2. Errata to the USB 2.0 specification as of December 7, 2000
  3. Mini-B connector Engineering Change Notice to the USB 2.0 specification.
  4. Pull-up/pull-down Resistors Engineering Change Notice to the USB 2.0 specification.
  5. Errata to the USB 2.0 specification as of May 28, 2002
  6. Interface Association Descriptor Engineering Change Notice to the USB 2.0 specification.
  7. Rounded Chamfer Engineering Change Notice to the USB 2.0 specification as of October 8, 2003
  8. Unicode Engineering Change Notice to the USB 2.0 specification as of February 21, 2005
  9. Inter-Chip USB Supplement Revision 1.0 as of March 13, 2006
  10. USB On-The-Go Supplement Revision 1.3 as of December 5, 2006
  11. Micro-USB Cables and Connectors Specification Revision 1.01 as of April 4, 2007
  12. USB 2.0 Link Power Management Addendum Engineering Change Notice to the USB 2.0 specification as of July 16, 2007.
  13. High-Speed Inter-Chip USB Electrical Specification Revision 1.0 as of September 23, 2007
  14. Suspend Current Limit Changes ECN as of April 9, 2008

Please check this site for any future updates to the USB 2.0 specification.

LEGAL DISCLAIMER

THIS SPECIFICATION IS PROVIDED "AS IS" AND WITHOUT ANY WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED. WITHOUT LIMITATION, THERE IS NO WARRANTY OF NON-INFRINGEMENT, NO WARRANTY OF MERCHANTABILITY, AND NO WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. ALL WARRANTIES ARE EXPRESSLY DISCLAIMED.

USER ASSUMES THE FULL RISK OF USING THIS SPECIFICATION. IN NO EVENT SHALL USB-IF BE LIABLE FOR ANY ACTUAL, DIRECT, INDIRECT, PUNITIVE, OR CONSEQUENTIAL DAMAGES ARISING FROM SUCH USE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

USB 2.0 Adopters Agreement
USB 2.0 Adopters Agreement (.pdf file format, size 22k)
The USB 2.0 Adopters Agreement allows a signing company to participate in a reciprocal, royalty-free licensing arrangement for compliant products. Any USB 2.0 Adopters Agreement shall only be effective if received within one (1) year after first sale of products that include 'Compliant Products'. See the USB 2.0 Adopters Agreement for details.

USB 2.0 On-The-Go Specification Supplement Adopters Agreement
The USB 2.0 Promoters have voted to adopt an addendum to the USB 2.0 Specification designated “On-The-Go Supplement to the USB 2.0 Specification” (the “Specification Supplement”). A copy of the Specification Supplement is located at: www.usb.org/developers/onthego). This letter is to provide USB 2.0 Adopters the option of extending their Adopter Agreement to address this new Spec Supplement (the Spec Supplement exceeds the scope of your original USB 2.0 Adopters Agreement, which is specific to the USB 2.0 Specification).

Adopters are under no obligation to amend their Adopters Agreement. However, those Parties that are Adopters as of the date of this Amendment Letter wishing to amend their Adopters Agreement must have the Amendment Letter (.pdf file format, size 16k) executed by a duly authorized representative and return the original signed letter to the address below to expand the scope of their Adopters Agreement. Once you have signed the Amendment Letter, return the original to the USB 2.0 Promoter Group at:

USB 2.0 Promoter Group

3855 SW 153rd Drive

Beaverton, OR 97006

USA


Low Voltage Inter-Chip Adopters Agreement Amendment

The USB 2.0 Promoters have voted to adopt an addendum to the USB 2.0 Specification designated "Low Voltage Inter-Chip Supplement to the USB 2.0 Specification" ("Spec Supplement", posted with the USB 2.0 spec above) and to provide USB 2.0 Adopters the option of extending their Adopter Agreement to address this new Spec Supplement (the Spec Supplement exceeds the scope of your original USB 2.0 Adopters Agreement, which is specific to the USB 2.0 Specification).

Adopters are under no obligation to amend their Adopters Agreement. However, those Parties that are Adopters as of the date of this Amendment Letter wishing to amend their Adopters Agreement must have the Amendment Letter (.pdf file format, size 12k) executed by a duly authorized representative and return the original signed letter to the address below by no later than March 20, 2007 to expand the scope of their Adopters Agreement. Parties becoming Adopters after the date of this Amendment Letter may amend their Adopters Agreement by signing and returning this Amendment Letter to the address below within their Adoption Period. Responses from existing USB 2.0 Adopters post marked after the applicable deadline are considered null and void. Once you have signed the Amendment Letter, return the original to the USB 2.0 Promoter Group at:

USB 2.0 Promoter Group

3855 SW 153rd Drive

Beaverton, OR 97006

USA

High-Speed Inter-Chip Adopters Agreement Amendment

The USB 2.0 Promoters have voted to adopt an addendum to the USB 2.0 Specification designated "High-Speed Inter-Chip Supplement to the USB 2.0 Specification" ("Spec Supplement", posted with the USB 2.0 spec above) and to provide USB 2.0 Adopters the option of extending their Adopter Agreement to address this new Spec Supplement (the Spec Supplement exceeds the scope of your original USB 2.0 Adopters Agreement, which is specific to the USB 2.0 Specification).


Adopters are under no obligation to amend their Adopters Agreement. However, those Parties that are Adopters as of the date of this Amendment Letter wishing to amend their Adopters Agreement must have the Amendment Letter (.pdf file format, size 16k) executed by a duly authorized representative and return the original signed letter to the address below by no later than September 24, 2008 to expand the scope of their Adopters Agreement. Parties becoming Adopters after the date of this Amendment Letter may amend their Adopters Agreement by signing and returning this Amendment Letter to the address below within their Adoption Period. Responses from existing USB 2.0 Adopters post marked after the applicable deadline are considered null and void. Once you have signed the Amendment Letter, return the original to the USB 2.0 Promoter Group at:


USB 2.0 Promoter Group

3855 SW 153rd Drive

Beaverton, OR 97006

USA

Intellectual Property Rights Notices
This page contains links to a reproduction of letters received by the USB-IF from patent owners asserting intellectual property rights that may be pertinent to the implementation of a USB specification. For specific information regarding the licensing of intellectual property rights arising from a particular USB Specification, the reader should consult the appropriate USB Adopters Agreement for that specification.

Notice to all readers: The USB-IF is providing this information as a courtesy to our members 'AS IS' and without warranty of any kind. The USB-IF is not responsible for content of the individual postings. The USB-IF will not be responsible for identifying patents for which a license may be required by a USB Specification nor for conducting inquiries into the legal validity or scope of those patents that are brought to its attention.

Errata (.pdf file format, size 172k) to the USB 2.0 Specification (As of May 28, 2002) In case you only want to download only the most recent Errata to the USB 2.0 Specification, download it here. Check this site for any future updates to the USB 2.0 specification.

Pull-up/pull-down Resistors Engineering Change Notice (ECN) (.pdf file format, size 133k) In case you only want to download the Pull-up/pull-down Resistors ECN, download it here. Also available for download is a reproduction of a letter received by the USB-IF from patent owners asserting intellectual property rights that may be pertinent to implementation.

Errata (.pdf file format, size 136k) to the USB 2.0 Specification (As of December 7, 2000) In case you only want to download this Errata to the USB 2.0 Specification, download it here. Check this site for any future updates to the USB 2.0 specification.

Mini-B Connector Engineering Change Notice (ECN) (.pdf file format, size 959k) In case you only want to download the Mini-B Connector ECN, download it here. Check this site for any future updates to the USB 2.0 specification.

Interface Association Descriptor Engineering Change Notice (ECN) (.pdf file format, size 140k) In case you only want to download the Interface Association Descriptor ECN, download it here. Check this site for any future updates to the USB 2.0 specification. This ECN requires a device I implementation use a class code in its device descriptor. The USB Interface Association Descriptor Device Class Code and Use Model White Paper documents the required class code and provides an informative overview on how the Interface Association Descriptor (IAD) should be use.

Round Chamfer Engineering Change Notice (ECN) (.pdf file format, size 60.8k) In case you only want to download the Round Chamfer ECN, download it here. Check this site for any future updates to the USB 2.0 specification.

USB 2.0 Icon Design Guideline This design guideline provides a recommendation to PC OEMs on how to distinguish USB 2.0 ports to address the scenario where a high-speed device is plugged into a Original USB (full/low-speed) port.

USB Technical Documents

These are some resources useful to USB developers:

High Speed USB Platform Design Guidelines (.pdf file format, size 298k) This new document provides guidelines for integrating a high-speed USB host controller onto a 4-layer desktop motherboard. It covers board design, EMI/ESD, and front panel USB guidelines. USB Device Class Specifications. Building on top of the USB specifications, there are Device Class Specifications from the Device Working Group. These specifications recommend design targets for classes of devices. For HID related information, please go to the HID Web page.

Requirements and Recommendations for USB Products with Embedded Hosts and/or Multiple Receptacles (.pdf file format, size 289k) will assist developers of products that don't fall into the traditional categories of host, hub or peripheral. An ever-increasing number of USB peripherals are being designed with more than a single device port, some including host ports that are intended to support only a limited set of peripherals.

USB-IF Compliance is expanding its coverage to ensure more complete testing of these types of products.

USB-IF Compliance Test Procedures

Compliance Test Procedures for High-Speed USB Products

There are two categories of electrical test procedures developed for high-speed USB products. One set is developed for use with Tektronix's digital sampling oscilloscopes and DG2040 digital data generator. The other set is developed for use with Agilent's Infiniium 54846A digital storage oscilloscope and 81130A Pulse/Pattern Generator. Each set documents the high-speed electrical tests required for the compliance program. Within each set, there is one document outlining the test process for high-speed device, one document outlining the test process for high-speed hub, and one document outlining the test process for high-speed host controllers. Please determine which set of procedures meet your need based on your test equipment choice.

High-Speed Electrical Test Procedures for Tektronix Test Equipment TDS7404, TDS7254, TDS6604, TDS6404 and DG2040 (Version 1.2).

High-Speed Electrical Test Procedures for Tektronix Test Equipment TDS 694C, DG2040 (Version 1.0)

High-Speed Electrical Test Procedures for Agilent Test Equipment 54853, 54854, and 54855 (Version 1.2)

High-Speed Electrical Test Procedures for Agilent Test Equipment 54846 and 1131 (Version 1.1)

High-Speed Electrical Test Procedures for Agilent Test Equipment (Version 1.0)

High-Speed Electrical Test Procedures for Agilent Test Equipment DSO80000A/B series, and 548XXA series using the N5416A USB 2.0 Compliance Test SW.

High-Speed Electrical Test Procedures for LeCroy Test Equipment WaveMaster and SDA (Version 1.0)

High-Speed Electrical Test Procedures for Yokogawa Test Equipment DL9240/DL9240L (Version 1.0)

High-Speed Electrical Test Specification (Version 1.03)

The High-Speed Electrical Test Specification (pdf, 194k) defines a set of electrical test criteria for USB 2.0 products. The compliance criteria are provided as a list of test assertions that describe specific characteristics or behaviors that must be met for USB 2.0 new silicons. Many though not all of the assertions are verified in the high-speed electrical test procedures.

USB High-Speed Electrical Test Tool

The USB High-Speed Electrical Test Tool is a test utility designed to facilitate the high-speed electrical tests. This test utility is required to perform each of the high-speed electrical test procedures. The USB High Speed Electrical Test Tool is a part of the USB High-Speed Electrical Test Tool Kit installation USBHSET.MSI which also including the setup instruction for configuring a High-Speed Signal Quality Analysis Computer and a High-Speed Electrical Test Bed Computer. Included in this installation are also GPIB-DAQ and the Matlab USB analysis script. This tool kit is provided in courtesy of Intel® Corporation.

USB-IF Full and Low Speed Electrical and Interoperability Compliance Test Procedure

This USB-IF Compliance Test Procedure (pdf, 1.3MB) was developed for all USB products before the advent of high-speed USB products. It documents the required compliance test of full-speed and low-speed signal quality, power delivery. Full speed electrical tests still apply to high speed devices. It documents interoperability tests for all device speeds. These tests are required for high-speed, full-speed, and low-speed USB products. The high speed electrical tests are documented in the USBHSET installation package. This document was updated on February 9, 2004.

USB-IF Embedded Host Compliance Procedures

Embedded hosts may be certified provided they meet specific criteria. The document, "USB-IF Embedded Host Compliance Plan, Revision 1.0, August 2006" defines the test criteria and rules for embedded hosts.

Compliance Updates

Please review the USB-IF Compliance Updates webpage frequently and subscribe to the news feed for the latest information regarding the USB-IF Compliance Program.

USB Current Adapters

As announced at the USB-IF compliance workshop in April, the USB-IF is providing a limited number of USB current adapters to USB-IF member companies.

LANGID Codes

A USB device can store strings in multiple languages. i.e. the string index defines which word or phrase should be communicated to the user (like "Format" or "Insert Disk") and the LANGID code identifies to a device, which language (German, Chinese, etc.) to retrieve that word or phase for. Here is a list of LANGIDs (.pdf file format, size 34k) defined for USB devices.

Note: To support forward compatibility, system software must allow the enumeration and selection of LANGIDs that are not currently on this list. And system software should never request a LANGID not defined in the LANGID code array (string index = 0) presented by a device.

Presentations

Presentations from our past conferences (1998 to 2002) are downloadable from this page in case you have not been able to attend one or in case you would like an electronic version of the binder contents which you received at a conference. If you were missing a segment in your binder these will also be useful to you.

White Papers

There are USB technical "White Papers" on various topics written by the Spec authors and other industry experts. These are provided as additional guidance and do not constitute official USB-IF collateral.

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