`Specification
`
`Compaq
`
`Hewlett-Packard
`
`Intel
`
`Lucent
`
`Microsoft
`
`NEC
`
`Philips
`
`Revision 2.0
`
`April 27, 2000
`
`ZTE/SAMSUNG 1008-0001
`IPR2018-00111
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`
`
`Universal Serial Bus Specification Revision 2.0
`
`Scope of this Revision
`The 2.0 revision of the specification is intended for product design. Every attempt has been made to ensure a
`consistent and implementable specification. Implementations should ensure compliance with this revision.
`
`Revision History
`
`Revision
`
`Issue Date
`
`Comments
`
`0.7
`
`0.8
`
`0.9
`
`0.99
`
`November 11, 1994
`
`Supersedes 0.6e.
`
`December 30, 1994
`
`Revisions to Chapters 3-8, 10, and 11 . Added
`appendixes.
`
`April 13, 1995
`
`Revisions to all the chapters.
`
`August 25, 1995
`
`Revisions to all the chapters.
`
`1.0 FDR
`
`November 13, 1995
`
`Revisions to Chapters 1, 2, 5-11.
`
`1.0
`
`1.1
`
`January 15, 1996
`
`Edits to Chapters 5, 6, 7, 8, 9, 10, and 11 for
`consistency.
`
`September 23, 1998
`
`Updates to all chapters to fix problems identified.
`
`2.0 (draft 0.79) October 5, 1999
`
`Revisions to chapters 5, 7, 8, 9, 11 to add high
`speed.
`
`2.0 (draft 0.9)
`
`December 21 , 1999
`
`Revisions to all chapters to add high speed.
`
`2.0
`
`April 27, 2000
`
`Revisions for high-speed mode.
`
`Universal Serial Bus Specification
`Copyright © 2000, Compaq Computer Corporation 1
`Hewlett-Packard Company, Intel Corporation, Lucent Technologies Inc,
`Microsoft Corporation, NEC Corporation, Koninklijke Philips Electronics N.V.
`All rights reserved.
`
`INTELLECTUAL PROPERTY DISCLAIMER
`THIS SPECIFICATION IS PROVLDED 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. Tiffi PROVISION OF THIS
`SPECIFICATION TO YOU DOES NOT PROVIDE YOU WITH ANY LICENSE, EXPRESS OR IMPLIED,
`BY ESTOPPEL OR OTlfERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS.
`
`All product names are trademarks, registered trademarks, or servicemarks of their respective owners.
`
`Please se11d comme11ts via e/ectro11ic mail to teclisup@µsb.org
`For industry i11formatio11, refer to the USB Imple111e11ters Forum web page at littp://111111111.usb.org
`
`ii
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`ZTE/SAMSUNG 1008-0002
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`Universal Serial Bus Specification Revision 2.0
`
`Acknowledgement of USS 2.0 Technical Contribution
`
`The authors of this specification would like to recognize the following people who participated in the USB
`2.0 Promoter Group technical working groups. We would also like to thank others in the USB 2.0
`Promoter companies and throughout the industry who contributed to the development of this specification.
`Hub Working Group
`John Garney
`Ken Stufflebeam
`David Wooten
`Matt Nieberger
`John Howard
`Venkat Iyer
`Steve McGowan
`Geert Knapen
`Zong Liang Wu
`Jim Clee
`Jim Guziak
`Dave Thompson
`John Fuller
`Nathan Sherman
`Mark Williams
`Nobuo Furuya
`Toshimi Sakurai
`Moto Sato
`Katsuya Suzuki
`
`Intel Corporation (Chair/Editor)
`Compaq Computer Corporation
`Compaq Computer Corporation
`Hewlett-Packard Company
`Intel Corporation
`Intel Corporation
`Intel Corporation
`Royal Philips Electronics
`Royal Philips Electronics
`Lucent Technologies Inc
`Lucent Technologies Inc
`Lucent Technologies Inc
`Microsoft Corporation
`Microsoft Corporation
`Microsoft Corporation
`NEC Corporation
`NEC Corporation
`NEC Corporation
`NEC Corporation
`
`Electrical Working Group
`Jon Lueker
`Intel Corporation (Chair/Editor)
`Compaq Computer Corporation
`David Wooten
`Hewlett-Packard Company
`Matt Nieberger
`Hewlett-Packard Company
`Larry laugher
`Venkat Iyer
`Intel Corporation
`Steve McGowan
`Intel Corporation
`Mike Pennell
`Intel Corporation
`Todd West
`Intel Corporation
`Gerrit den Besten
`Royal Philips Electronics
`Marq Kole
`Royal Philips Electronics
`Zong Liang Wu
`Royal Philips Electronics
`Jim Clee
`Lucent Technologies Inc
`Jim Guziak
`Lucent Technologies Inc
`Par Parikh
`Lucent Technologies Inc
`Dave Thompson
`Lucent Technologies Inc
`Ed Giaimo
`Microsoft Corporation
`Mark Williams
`Microsoft Corporation
`Toshihiko Ohtani
`NEC Corporation
`NEC Corporation
`Kugao Ouchi
`Katsuya Suzuki
`NEC Corporation
`Toshio Tasaki
`NEC Corporation
`
`iii
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`ZTE/SAMSUNG 1008-0003
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`Universal Serial Bus Specification Revision 2.0
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`iv
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`ZTE/SAMSUNG 1008-0004
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`Universal Serial Bus Specification Revision 2.0
`
`Contents
`
`CHAPTER 1 INTRODUCTION
`
`1.1 Motivation .............................................................................................................................................. I
`
`1.2 Objective of the Specification ............................................................................................................... 1
`
`1.3
`
`Scope of the Document .......................................................................................................................... 2
`
`1.4 USB Product Compliance .................................... ,. ................................................................................ 2
`
`1.5 Document Organization ........................................................................................................................ 2
`
`CHAPTER 2 TERMS AND ABBREVIATIONS
`
`CHAPTER 3 BACKGROUND
`
`3.1 Goals for the Universal Serial Bus ..................................................................................................... 11
`
`3.2 Taxonomy of Application Space ......................................................................................................... 12
`
`3.3
`
`Feature List .......................................................................................................................................... 13
`
`CHAPTER 4 ARCHITECTURAL OVERVIEW
`
`4.1 USB System Description ..................................................................................................................... 15
`4.1.1
`Bus Topology .. .... ........................................................................................................................... 16
`
`Physical Interface ................................................................................................................................ 17
`4.2
`4.2.1
`Electrical.. ....................................................................................................................................... 17
`4.2.2 Mechanical ..................................................................................................................................... 18
`
`Power .................................................................................................................................................... 18
`4.3
`4.3.1
`Power Distribution ............................... ............. ............................................................................. 18
`4.3 .2
`Power Management ........................................................................................................................ 18
`
`4.4 Bus Protocol ......................................................................................................................................... 18
`
`4.5 Robustness ............................................................................................................................................ 19
`4.5.1
`Error Detection ........................................................................................ ....................................... 19
`4.5.2 Error Handling ................................................................................................................................ 19
`
`4.6 System Configuration .......................................................................................................................... 19
`4.6.1 Attachment ofUSB Devices ........................................................................................ .. ................. 20
`4.6.2 Removal ofUSB Devices ..................................................................... .......................................... 20
`4.6.3 Bus Enumeration .................................................................................... .... .................................... 20
`
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`4. 7 Data Flow Types ....................................•.............................................................................................. 20
`4.7.1 Control Transfers ............................................................................................................................. 21
`4.7.2 Bulk Transfers ................................................................................................................................. 21
`4.7.3
`Interrupt Transfers ........................................................................................................................... 21
`4.7.4
`Isochronous Transfers ..................................................................................................................... 21
`4.7.5 Allocating USB Bandwidth ............................................................................................................. 21
`
`4.8 USB Devices .......................................................................................................................................... 22
`4.8.1 Device Characterizations ................................................................................................................. 22
`4.8.2 Device Descriptions ....................................................................................................................... .22
`
`4.9 USB Host: Hardware and Software ................................................................................................... 24
`
`4.10 Architectural Extensions ...................................................................................................................... 24
`
`CHAPTER 5 USB DAT A FLOW MODEL
`
`5.1
`
`Implementer Viewpoints ...................................................................................................................... 25
`
`5.2 Bus Topology ........................................................................................................................................ 27
`5.2.J USB Host ........................................................................................................................................ 27
`5.2.2 USB Devices ................................................................................................................................... 28
`5.2.3
`Physical Bus Topology .................................................................................................................... 29
`5.2.4 Logical Bus Topology ..................................................................................................................... 30
`5.2.5 Client Software-to-function Relationship ....................................................................................... .31
`
`5.3 USB Communication Flow .................................................................................................................. 31
`5.3.1 Device Endpoints ............................................................................................................................ 33
`5.3.2
`Pipes ................................................................................................................................................ 34
`5.3.3
`Frames and Microframes ................................................................................................................ .36
`
`5.4 Transfer Types ...................................................................................................................................... 36
`5.4.1
`Table Calculation Examples ........................................................................................................... .37
`
`5.5 Control Transfers ................................................................................................................................. 38
`5.5.1 Control Transfer Data Format ......................................................................................................... 38
`5.5.2 Control Transfer Direction ............................................................................................................. .39
`5.5.3 Control Transfer Packet Size Constraints ....................................................................................... .39
`5.5.4 Control Transfer Bus Access Constraints ....................................................................................... .40
`5.5.5 Control Transfer Data Sequences ................................................................................................... .43
`
`Isochronous Transfers .......................................................................................................................... 44
`5.6
`5.6.1
`Isochronous Transfer Data Format ................................................................................................. .44
`5.6.2
`Isochronous Transfer Direction ...................................................................................................... .44
`5.6.3
`Isochronous Transfer Packet Size Constraints ............................................................................... .44
`Isochronous Transfer Bus Access Constraints ............................................................................... .47
`5.6.4
`5.6.5
`Isochronous Transfer Data Sequences ............................................................................................. 47
`
`Interrupt Transfers .............................................................................................................................. 48
`5. 7
`5.7.1
`Interrupt Transfer Data Format ...................................................................................................... .48
`5. 7.2
`Interrupt Transfer Direction ............................................................................................................ 48
`Interrupt Transfer Packet Size Constraints ..................................................................................... .48
`5.7.3
`Interrupt Transfer Bus Access Constraints ..................................................................................... .49
`5.7.4
`5.7.5
`Interrupt Transfer Data Sequences .................................................................................................. 52
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`5.8 Bulk Transfers ..................................................................................................................................... 52
`5.8.1 Bulk Transfer Data Format ............................................................................................................. 52
`5.8.2 Bulk Transfer Direction ................................................................. ................................................. 52
`5.8.3 Bulk Transfer Packet Size Constraints ........................................................................................... 53
`5.8.4 Bulk Transfer Bus Access Constraints ..................................................................................... ...... 53
`5.8.5 Bulk Transfer Data Sequences ....................................................................................................... 55
`
`5.9 High-Speed, High Bandwidth Endpoints ........................................................................................... 56
`5.9.1 High Bandwidth Interrupt Endpo ints ........ ..................................................................................... 56
`5.9.2 High Bandwidth Isochronous Endpoints ........................................................................................ 57
`
`5.10 Split Transactions ................................................................................................................................ 58
`
`5.11 Bus Access for Transfers ..................................................................................................................... 58
`5.11.1 Transfer Management. .................................................................................................................... 59
`5.11.2 Transaction Tracking ...................................................................................................................... 61
`5.11 .3 Calculating Bus Transaction Times ................... .... ............................... .......................................... 63
`5.11.4 Calculating Buffer Sizes in Functions and Software ...................................................................... 65
`5.11 .5 Bus Bandwidth Reclamation .............. .................................................. ............ .............................. 65
`
`5.12 Special Considerations for Isochronous Transfers ........................................................................... 65
`5.1 2.1 Example Non-USB Isochronous Application ................................................................................. 66
`5.1 2.2 USB Clock Model ................................. .................................................................................. ....... 69
`5 .12.3 Clock Synchronization ............................................................................................................ ....... 71
`5.12.4
`Isochronous Devices ....................................................................................................................... 71
`5.12.5 Data Prebuffering ................................ ........................................................................................... 80
`5.12.6 SOFTracking ................................................................................................................................. 81
`5.12.7 Error Handling ................................................................................................................................ 81
`5.12.8 Buffering for Rate Matching ................................................................................................... ....... 82
`
`CHAPTER 6 MECHANICAL
`
`6.1 Architectural Overview ....................................................................................................................... 85
`
`6.2 Keyed Connector Protocol .................................................................................................................. 85
`
`6.3 Cable ..................................................................................................................................................... 86
`
`6.4 Cable Assembly .................................................................................................................................... 86
`6.4.1 Standard Detachable Cable Assemblies ......................................................................................... 86
`6.4.2 High-/full -speed Captive Cable Assemblies ................................................................................... 88
`6.4.3
`Low-speed Captive Cable Assemblies .......................................................................................... . 90
`6.4.4 Prohibited Cable Assemblies ..................................... ..... ................................................................ 92
`
`6.5 Connector Mechanical Configuration and Material Requirements ................................................ 93
`6.5.1 USB Icon Location ......................................................................................................................... 93
`6.5.2 USB Connector Termination Data ................................................................................................. 94
`6.5.3
`Series "A" and Series "B" Receptacles .......................................................................................... 94
`6.5.4 Series "A" and Series " B" .Plugs .................................................................................................... 98
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`6.6 Cable Mechanical Configuration and Material Requirements ...................................................... 102
`6.6.1 Description .................................................................................................................................... 102
`6.6.2 Construction .................................................................................................................................. 103
`6.6.3
`Electrical Characteristics ......................................................... .. ............................................ ........ 105
`6.1.4 Cable Environmental Characteristics ....................................................................................... ..... 106
`6.1.5 L isting ................................................................... ......................... ....................... ........................ 106
`
`6.7 Electrical, Mechanical, and Environmental Compliance Standards ............................................ .106
`6.7.1 Applicable Documents .................................................................................................................. 114
`
`6.8 USB Grounding .................................................................................................................................. 114
`
`6.9
`
`PCB Reference Drawings ................................................................................................................... 114
`
`CHAPTER 7 ELECTRICAL
`
`Signaling .............................................................................................................................................. 119
`7.1
`7.1. l USB Driver Characteristics ............................................................ ............................................... 123
`7 .1.2 Data Signal Rjse and Fall, Eye Patterns ........................................................................................ 129
`7.1.3 Cable Skew ................. ...................... ..................... .... .............................................................. ...... 139
`7.1.4 Receiver Characteristics ................................... .............................. ............................................... 139
`7 .1.5 Device Speed Identification .......................................................................................................... 141
`7. 1.6
`[nput Characteristics ............................................... ....................................................................... 142
`7. 1.7
`SignalingLevels ........................................................ ..... ............................................................... 144
`7 .1.8 Data Encoding/Decoding ................. ................................................ ......................... .................... 157
`7.1.9 Bit Stuffing .................................................................................................................................... 157
`7.1.10 SyncPattern ... ............................................................................................................................... 159
`7.1.11 Data Signaling Rate .......................................................................... ............................................. 159
`7.1.12 Frame Interval ................................. ................................................ ........................ ...................... 159
`7 .1 .13 Data Source Signal ing .................... ............................................................................................... 160
`7 .1 .14 Hub Signaling Timings ................................................................................................................. 162
`7 .1 .15 Receiver Data Jitter ......................................................................................... .............................. 164
`7.1 .16 CableDelay ................... ............... ................................................... .............................................. 165
`7. 1.17 Cable Attenuation .......................................................................................................................... 167
`7.1.18 Bus Turn-around Time and Inter-packet Delay ........ ............................................................ ......... 168
`7 .1.19 Maximum End-to-end Signal Delay .............................................................................................. 168
`7 .1.20 Test Mode Support ........................................................................................................................ 169
`
`7.2
`Power Distribution ............................................................................................................................. 171
`7.2. 1 Classes ofDevices .............. .............. ................................................ ............................................. 171
`7.2.2 Voltage Drop Budget .................................................................................................................... 175
`7.2.3
`Power Control During Suspend/Resume ....................................................................................... 176
`7.2.4 Dynamic Attach and Detach .................................. ............................. ........................................... 177
`
`Physical Layer ..................................................................................................................................... 178
`7.3
`7.3.1
`Regulatory Requirements .................................................. .............. .................. ............................ 178
`7.3.2 Bus Timing/Electrical Characteristics ........................................................................................... 178
`7 .3 .3 Timing Waveforms ....................................................................................................................... 191
`
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`CHAPTER 8 PROTOCOL LA YER
`
`8.1 Byte/Bit Ordering .............................................................................................................................. 195
`
`8.2
`
`SYNC Field ......................................................................................................................................... 195
`
`8.3
`Packet Field Formats ......................................................................................................................... 195
`8.3.1
`Packet Identifier Field .................................... .............................................................................. 195
`8.3.2 Address Fields ............................................................................................. ................................. 197
`8.3.3 Frame Number Field .. ..... ............................................................................. ................................. 197
`8.3.4 Data Field .................................................................................................... ................................. 197
`8.3.5 Cyclic Redundancy Checks .................................................................................................. ........ 198
`
`8.4 Packet Formats .................................................................................................................................. 199
`Token Packets ............................................................................................................................... 199
`8.4. l
`8 .4.2
`Split Transaction Special Token Packets ...................................................................................... 199
`8.4.3
`Start-of-Frame Packets ................................................................................................................. 204
`8.4.4 Data Packets ................................................................................................................................. 206
`8.4.5 Handshake Packets ............................................................................................. ................. ......... 206
`8.4.6 Handshake Responses .................................................................................................................. 207
`
`8.5 Transaction Packet Sequences .......................................................................................................... 209
`8.5.l NAK Limiting via Ping Flow Control ...................... .................................................................... 217
`8.5.2 Bulk Transactions ...................................................... .. .. ............................................................... 221
`8.5.3 Control Transfers .............. .............. .................................................................. .. .......................... 225
`Interrupt Transactions ..................................................... ............... ............................................... 228
`8.5.4
`Isochronous Transactions ............................................................................................................. 229
`8.5.5
`
`8.6 Data Toggle Synchronization and Retry ......................................................................................... 232
`8.6.1
`Initialization via SETUP Token ................................................................................................... 233
`8.6.2
`Successful Data Transactions ................................................. ...................................................... 233
`8.6.3 Data Corrupted or Not Accepted .................................................................................................. 233
`8.6.4 Corrupted ACK Handshake .......................................................................................................... 234
`8.6.5 Low-speed Transactions ............................................................................................................... 235
`
`8.7 Error Detection and Recovery .......................................................................................................... 236
`8.7.1
`Packet Error Categories ................................................................ ................................................ 236
`8.7.2 Bus Tum-around Timing ............................................................. ................................................. 237
`8.7.3
`False EOPs ................................................................................................................................... 237
`8. 7.4 Babble and Loss of Activity Recovery ......................................................................................... 23 8
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`Universal Serial Bus Specification Revision 2.0
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`CHAPTER 9 USB DEVICE FRAMEWORK
`
`9.1 USB Device States ............................................................................................................................... 239
`9.1.1 Visible Device States ............. ...... .. .................................................................................... .. .......... 239
`9.1.2 Bus Enumeration ........................................................................................................................... 243
`
`9.2 Generic USB Device Operations ....................................................................................................... 244
`9.2.1 Dynamic Attachment and Removal ......... .......................................................................... ............ 244
`9.2.2 Address Assignment ................................................................ ...................................................... 244
`Configuration ........................................................................... ....................................... .............. 244
`9.2.3
`9.2.4 Data Transfer .............................................................................................................................