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extensible-host-controler-interface-usb-xhci-1.1（解密有书签）.pdf
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xHCI1.1协议，解密板，有书签。eXtensible Host Controller Interface for Universal Serial Bus (xHCI)
Requirements Specification November 2017 Revision 1.1
eXtensible Host Controller Interface for
Universal Serial Bus
(xHCI)
Requirements Specification
November 2017
Revision 1.1
2
NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS
DOCUMENT. CONTACT INTEL ON FURTHER LICENSING AGREEMENTS AND REQUIREMENTS.
INTEL ASSUMES NO LIABILITY WHATSOEVER AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE
OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR
INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or
characteristics of any features or instructions marked “reserved” or “undefined.” Intel reserves these for future definition and shall have no
responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
Copyright © 2008-2017 Intel Corporation. All rights reserved.
3
Contents
1 Preface ....................................................................................................................................................................................... 22
1.1 Objective of Specification ............................................................................................................................... 22
1.2 Scope of Document ........................................................................................................................................... 22
1.3 Document Organization .................................................................................................................................. 22
1.4 References ............................................................................................................................................................. 23
1.5 Index ......................................................................................................................................................................... 24
1.6 Terms and Abbreviations ................................................................................................................................ 26
1.7 Compliance ............................................................................................................................................................ 43
1.8 Documentation Conventions ........................................................................................................................ 43
1.8.1 Capitalization.................................................................................................................................. 43
1.8.2 Bold Text .......................................................................................................................................... 43
1.8.3 Italic Text .......................................................................................................................................... 43
1.8.4 Numbers and Number Bases .................................................................................................. 43
1.8.5 Implementation Notes ............................................................................................................... 44
1.8.6 Word Usage .................................................................................................................................... 44
1.8.7 Pseudo Code .................................................................................................................................. 44
1.8.8 Other Notation ............................................................................................................................... 45
2 Introduction ............................................................................................................................................................................. 46
2.1 Motivation .............................................................................................................................................................. 46
2.2 Goals ......................................................................................................................................................................... 47
2.3 Key features........................................................................................................................................................... 47
2.4 xHCI Product Compliance ............................................................................................................................... 49
3 Architectural Overview ....................................................................................................................................................... 50
3.1 Interface Architecture ....................................................................................................................................... 53
3.2 xHCI Data Structures ......................................................................................................................................... 56
3.2.1 Device Context Base Address Array .................................................................................... 56
3.2.2 Device Context ............................................................................................................................... 56
3.2.3 Slot Context .................................................................................................................................... 57
3.2.4 Endpoint Context ......................................................................................................................... 57
3.2.5 Input Context .................................................................................................................................. 59
3.2.6 Rings ................................................................................................................................................... 60
3.2.7 Transfer Request Block ............................................................................................................. 61
3.2.8 Scatter/Gather Transfers .......................................................................................................... 63
3.2.9 Control Transfers ......................................................................................................................... 65
3.2.10 Bulk and Interrupt Transfers ................................................................................................... 66
3.2.11 Isoch Transfers .............................................................................................................................. 66
3.3 Command Interface ........................................................................................................................................... 69
3.3.1 No Op ................................................................................................................................................. 70
3.3.2 Enable Slot ...................................................................................................................................... 70
3.3.3 Disable Slot ..................................................................................................................................... 71
3.3.4 Address Device .............................................................................................................................. 71
3.3.5 Configure Endpoint ..................................................................................................................... 72
4
3.3.6 Evaluate Context ........................................................................................................................... 73
3.3.7 Reset Endpoint .............................................................................................................................. 73
3.3.8 Stop Endpoint ................................................................................................................................ 74
3.3.9 Set TR Dequeue Pointer ............................................................................................................ 74
3.3.10 Reset Device ................................................................................................................................... 74
3.3.11 Force Event ..................................................................................................................................... 74
3.3.12 Negotiate Bandwidth .................................................................................................................. 74
3.3.13 Set Latency Tolerance Value .................................................................................................. 75
3.3.14 Get Port Bandwidth ..................................................................................................................... 75
3.3.15 Force Header .................................................................................................................................. 75
3.4 General Information .......................................................................................................................................... 75
3.5 Root Hub Management .................................................................................................................................... 76
3.6 xHCI Device Enumeration ............................................................................................................................... 76
4 Operational Model ............................................................................................................................................................... 77
4.1 Command Operation ........................................................................................................................................ 77
4.2 Host Controller Initialization ......................................................................................................................... 77
4.3 USB Device Initialization .................................................................................................................................. 79
4.3.1 Resetting a Root Hub Port ........................................................................................................ 84
4.3.2 Device Slot Assignment ............................................................................................................. 84
4.3.3 Device Slot Initialization ............................................................................................................ 85
4.3.4 Address Assignment ................................................................................................................... 86
4.3.5 Device Configuration .................................................................................................................. 86
4.3.6 Setting Alternate Interfaces ..................................................................................................... 87
4.3.7 Low-Speed/Full-Speed Device Support ............................................................................ 90
4.3.8 Bandwidth Management ........................................................................................................... 90
4.4 Device Detach ....................................................................................................................................................... 90
4.5 Device Slot Management ................................................................................................................................ 91
4.5.1 Device Context Index .................................................................................................................. 92
4.5.2 Slot Context Initialization ......................................................................................................... 93
4.5.3 Slot States ........................................................................................................................................ 94
4.5.4 USB Standard Device Request to xHCI Command Mapping .................................... 99
4.6 Command Interface ........................................................................................................................................ 100
4.6.1 Command Ring Operation .................................................................................................... 100
4.6.2 No Op .............................................................................................................................................. 103
4.6.3 Enable Slot ................................................................................................................................... 104
4.6.4 Disable Slot .................................................................................................................................. 105
4.6.5 Address Device ........................................................................................................................... 107
4.6.6 Configure Endpoint .................................................................................................................. 111
4.6.7 Evaluate Context ........................................................................................................................ 123
4.6.8 Reset Endpoint ........................................................................................................................... 125
4.6.9 Stop Endpoint ............................................................................................................................. 129
4.6.10 Set TR Dequeue Pointer ......................................................................................................... 137
4.6.11 Reset Device ................................................................................................................................ 140
4.6.12 Force Event (Optional Normative) ..................................................................................... 142
4.6.13 Negotiate Bandwidth (Optional Normative) ................................................................. 144
4.6.14 Set Latency Tolerance Value (LTV) (Optional Normative) ...................................... 146
4.6.15 Get Port Bandwidth .................................................................................................................. 147
4.6.16 Force Header ............................................................................................................................... 150
4.7 Doorbells ............................................................................................................................................................. 151
4.8 Endpoint .............................................................................................................................................................. 153
5
4.8.1 Endpoint Addressing ............................................................................................................... 153
4.8.2 Endpoint Context Initialization ........................................................................................... 154
4.8.3 Endpoint Context State .......................................................................................................... 155
4.9 TRB Ring ............................................................................................................................................................... 159
4.9.1 Transfer Descriptors ................................................................................................................ 161
4.9.2 Transfer Ring Management .................................................................................................. 162
4.9.3 Command Ring Management .............................................................................................. 171
4.9.4 Event Ring Management ........................................................................................................ 172
4.10 Host Controller TRB Handling ................................................................................................................... 181
4.10.1 Transfer TRBs .............................................................................................................................. 181
4.10.2 Errors ............................................................................................................................................... 186
4.10.3 Events ............................................................................................................................................. 196
4.10.4 IOC Flag .......................................................................................................................................... 199
4.11 TRBs ....................................................................................................................................................................... 200
4.11.1 TRB Template ............................................................................................................................. 200
4.11.2 Transfer TRBs .............................................................................................................................. 202
4.11.3 Event TRBs.................................................................................................................................... 214
4.11.4 Command TRBs.......................................................................................................................... 215
4.11.5 Other TRBs ................................................................................................................................... 219
4.11.6 Vendor Defined TRB Types .................................................................................................. 223
4.11.7 TD Usage Rules .......................................................................................................................... 224
4.12 Streams ................................................................................................................................................................ 231
4.12.1 xHCI Stream Protocol .............................................................................................................. 232
4.12.2 Stream ID Management .......................................................................................................... 237
4.12.3 Evaluate Next TRB (ENT) ........................................................................................................ 241
4.13 Device Notifications ........................................................................................................................................ 242
4.13.1 Latency Tolerance Message Handling ............................................................................. 243
4.13.2 Function Wake ............................................................................................................................ 245
4.14 Managing Transfer Rings .............................................................................................................................. 246
4.14.1 General Scheduling Model .................................................................................................... 247
4.14.2 Periodic Transfer Ring Scheduling .................................................................................... 249
4.14.3 Interrupt Transfer Ring Scheduling .................................................................................. 257
4.14.4 Asynchronous Transfer Ring Scheduling ....................................................................... 260
4.15 Suspend-Resume ............................................................................................................................................ 267
4.15.1 Port Suspend ............................................................................................................................... 269
4.15.2 Port Resume ................................................................................................................................ 270
4.16 Bandwidth Management .............................................................................................................................. 274
4.16.1 Bandwidth Negotiation ........................................................................................................... 275
4.16.2 Bandwidth Domains ................................................................................................................. 277
4.17 Interrupters......................................................................................................................................................... 278
4.17.1 Interrupter Mapping ................................................................................................................. 279
4.17.2 Interrupt Moderation ............................................................................................................... 280
4.17.3 Interrupt Pin Support .............................................................................................................. 284
4.17.4 Interrupter Target Identification ........................................................................................ 285
4.17.5 Interrupt Blocking ..................................................................................................................... 286
4.18 Transfer Definition and Attributes ........................................................................................................... 287
4.18.1 No snoop ....................................................................................................................................... 287
4.18.2 No Snoop and Relaxed Ordering for USB Traffic ....................................................... 288
4.19 Root Hub .............................................................................................................................................................. 289
4.19.1 Root Hub Port State Machines ............................................................................................ 289
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