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eXtensible Host Controller Interface for Universal Serial Bus (xHCI) Requirements Specification Revision 1.2b USB xHCI 规范， RV1.2 《USB eXtensible Host Controller Interface (xHCI) 要求规范修订版 1.2b》 USB xHCI规范是针对通用串行总线（Universal Serial Bus, USB）的一种扩展主机控制器接口，旨在提高USB设备的性能和效率。在RV1.2版本中，该规范对之前的标准进行了更新和优化，以满足不断发展的USB技术需求。 USB xHCI规范的核心目标是为系统设计者提供一个标准化的接口，使得主机控制器能够有效地管理和通信高速USB 3.0及后续版本的设备。这个接口引入了新的功能和改进，如增强的数据传输效率、更低的功耗管理以及更好的兼容性。文档编号625472的《USB xHCI要求规范》是2023年4月发布的一个修订版，强调了该接口在开发阶段的信息。需要注意的是，此文档中的信息可能会随时变化，因此不应基于这些信息进行最终设计决策。Intel公司对其产品在设计阶段的信息持有保密性，并提示用户在获取最新的产品规格和路线图时联系Intel代表。 Intel技术的特点和优势依赖于系统的配置，可能需要启用特定硬件、软件或服务激活。用户可以在intel.com网站，或通过原始设备制造商（OEM）或零售商了解更多详情。然而，任何计算机系统都无法绝对安全，Intel不承担因数据丢失或被盗以及由此造成的损失所导致的任何责任。文档中明确指出，用户不能将此文档用于与英特尔产品侵权或其他法律分析有关的用途。用户同意向Intel授予非排他性的、无版税的许可，以涵盖在此文档中披露的任何主题的专利权。此外，所有产品都可能包含已知的设计缺陷或错误（称为errata），这可能导致产品偏离发布的规格。如果需要当前已鉴定的errata信息，可以应要求提供。该文档还指出，其中包含处于开发阶段的产品、服务和/或过程的信息，所有信息都可能未经通知即发生变化。用户应联系Intel代表获取最新的Intel产品规格和路线图。 Intel否认所有明示和暗示的保修，包括但不限于对于适销性、特定目的的适用性以及不侵犯的暗示保修，以及任何基于交易习惯、交易过程或使用方式产生的保修。这意味着用户在使用该规范时，应自行承担风险。 USB xHCI规范修订版1.2b是USB技术发展的重要里程碑，它推动了USB设备与主机之间的高效交互，同时也为开发者提供了更稳定的接口标准，以适应快速演进的USB生态系统。

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Document Number: 625472

eXtensible Host Controller

Interface for Universal Serial

Bus (xHCI)

Requirements Specification

April 2023

Revision 1.2b

Intel Confidential

2 Document Number: 625472, Revision: 1.2b

Intel Confidential

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Document Number: 625472, Revision: 1.2b    3 
Contents 
Preface .............................................................................................. 21 
1  Objective of Specification ........................................................... 21 
2  Scope of Document .................................................................. 21 
3  Document Organization ............................................................. 21 
4  References .............................................................................. 22 
5  Index...................................................................................... 23 
6  Terms and Abbreviations ........................................................... 25 
7  Compliance ............................................................................. 36 
8  Documentation Conventions ....................................................... 37 
8.1  Capitalization .................................................................. 37 
8.2  Bold Text ........................................................................ 37 
8.3  Italic Text ....................................................................... 37 
8.4  Numbers and Number Bases ............................................. 37 
8.5  Implementation Notes ...................................................... 37 
8.6  Word Usage .................................................................... 37 
8.7  Pseudo Code ................................................................... 38 
8.8  Other Notation ................................................................ 38 
Introduction ...................................................................................... 40 
1  Motivation ............................................................................... 40 
2  Goals ...................................................................................... 40 
3  Key features ............................................................................ 41 
4  xHCI Product Compliance .......................................................... 42 
Architectural Overview ...................................................................... 43 
1  Interface Architecture ............................................................... 46 
2  xHCI Data Structures ................................................................ 48 
2.1  Device Context Base Address Array .................................... 48 
2.2  Device Context ................................................................ 48 
2.3  Slot Context ................................................................... 49 
2.4  Endpoint Context ............................................................. 50 
2.5  Input Context ................................................................. 51 
2.6  Rings ............................................................................. 52 
2.7  Transfer Request Block ..................................................... 53 
2.8  Scatter/Gather Transfers .................................................. 55 
2.9  Control Transfers ............................................................. 56 
2.10 Bulk and Interrupt Transfers ............................................. 58 
2.11 Isoch Transfers ............................................................... 58 
3  Command Interface .................................................................. 60 
3.1  No Op ............................................................................ 61 
3.2  Enable Slot ..................................................................... 61 
3.3  Disable Slot .................................................................... 61 
3.4  Address Device ............................................................... 62 
3.5  Configure Endpoint .......................................................... 62 
3.6  Evaluate Context ............................................................. 64 
3.7  Reset Endpoint ................................................................ 64 
3.8  Stop Endpoint ................................................................. 64 
3.9  Set TR Dequeue Pointer .................................................... 64 

 
  Document Number: 625472, Revision: 1.2b 
Intel Confidential 
3.10 Reset Device ................................................................... 65 
3.11 Force Event .................................................................... 65 
3.12 Negotiate Bandwidth ........................................................ 65 
3.13 Set Latency Tolerance Value ............................................. 65 
3.14 Get Port Bandwidth .......................................................... 65 
3.15 Force Header .................................................................. 66 
4  General Information .................................................................. 66 
5  Root Hub Management .............................................................. 66 
6  xHCI Device Enumeration .......................................................... 67 
Operational Model ............................................................................. 68 
1  Command Operation ................................................................. 68 
2  Host Controller Initialization ....................................................... 68 
3  USB Device Initialization ............................................................ 71 
3.1  Resetting a Root Hub Port ................................................. 74 
3.2  Device Slot Assignment .................................................... 75 
3.3  Device Slot Initialization ................................................... 75 
3.4  Address Assignment ......................................................... 76 
3.5  Device Configuration ........................................................ 77 
3.6  Setting Alternate Interfaces .............................................. 78 
3.7  Low-Speed/Full-Speed Device Support ................................ 80 
3.8  Bandwidth Management ................................................... 80 
4  Device Detach .......................................................................... 81 
5  Device Slot Management ........................................................... 81 
5.1  Device Context Index ....................................................... 83 
5.2  Slot Context Initialization .................................................. 83 
5.3  Slot States ..................................................................... 84 
5.4  USB Standard Device Request to xHCI Command Mapping .... 89 
6  Command Interface .................................................................. 90 
6.1  Command Ring Operation ................................................. 91 
6.2  No Op ............................................................................ 93 
6.3  Enable Slot ..................................................................... 94 
6.4  Disable Slot .................................................................... 96 
6.5  Address Device ............................................................... 97 
6.6  Configure Endpoint ........................................................ 102 
6.7  Evaluate Context ........................................................... 112 
6.8  Reset Endpoint .............................................................. 114 
6.9  Stop Endpoint ............................................................... 118 
6.10 Set TR Dequeue Pointer .................................................. 125 
6.11 Reset Device ................................................................. 128 
6.12 Force Event (Optional Normative) .................................... 130 
6.13 Negotiate Bandwidth (Optional Normative) ........................ 131 
6.14 Set Latency Tolerance Value (LTV) (Optional Normative) ..... 133 
6.15 Get Port Bandwidth (Optional Normative) .......................... 135 
6.16 Force Header ................................................................ 138 
6.17 Get Extended Property (Optional Normative) ..................... 139 
6.18 Set Extended Property (Optional Normative) ..................... 141 
7  Doorbells ............................................................................... 142 
8  Endpoint ................................................................................ 143 
8.1  Endpoint Addressing ...................................................... 144 
8.2  Endpoint Context Initialization ......................................... 144 

 
Document Number: 625472, Revision: 1.2b    5 
8.3  Endpoint Context State................................................... 146 
9  TRB Ring ................................................................................ 149 
9.1  Transfer Descriptors ....................................................... 151 
9.2  Transfer Ring Management ............................................. 152 
9.3  Command Ring Management ........................................... 160 
9.4  Event Ring Management ................................................. 161 
10  Host Controller TRB Handling .................................................... 170 
10.1 Transfer TRBs ............................................................... 170 
10.2 Errors .......................................................................... 175 
10.3 Events ......................................................................... 184 
10.4 IOC Flag ....................................................................... 187 
11  TRBs ..................................................................................... 188 
11.1 TRB Template ............................................................... 188 
11.2 Transfer TRBs ............................................................... 190 
11.3 Event TRBs ................................................................... 200 
11.4 Command TRBs ............................................................. 202 
11.5 Other TRBs ................................................................... 206 
11.6 Vendor Defined TRB Types .............................................. 210 
11.7 TD Usage Rules ............................................................. 211 
12  Streams ................................................................................. 218 
12.1 xHCI Stream Protocol ..................................................... 219 
12.2 Stream ID Management .................................................. 223 
12.3 Evaluate Next TRB (ENT) ................................................ 227 
13  Device Notifications ................................................................. 229 
13.1 Latency Tolerance Message Handling ................................ 229 
13.2 Function Wake .............................................................. 231 
14  Managing Transfer Rings .......................................................... 232 
14.1 General Scheduling Model ............................................... 233 
14.2 Periodic Transfer Ring Scheduling .................................... 235 
14.3 Interrupt Transfer Ring Scheduling ................................... 243 
14.4 Asynchronous Transfer Ring Scheduling ............................ 245 
15  Suspend-Resume .................................................................... 252 
15.1 Port Suspend ................................................................ 253 
15.2 Port Resume ................................................................. 254 
16  Bandwidth Management ........................................................... 258 
16.1 Bandwidth Negotiation ................................................... 259 
16.2 Bandwidth Domains ....................................................... 260 
17  Interrupters ............................................................................ 261 
17.1 Interrupter Mapping ....................................................... 263 
17.2 Interrupt Moderation ...................................................... 263 
17.3 Interrupt Pin Support ..................................................... 267 
17.4 Interrupter Target Identification ...................................... 267 
17.5 Interrupt Blocking .......................................................... 268 
18  Transfer Definition and Attributes .............................................. 270 
18.1 No snoop ...................................................................... 270 
18.2 No Snoop and Relaxed Ordering for USB Traffic ................. 270 
19  Root Hub ................................................................................ 272 
19.1 Root Hub Port State Machines ......................................... 272 
19.2 Port Status Change Generation ........................................ 291 
19.3 Connect Status Change Reporting .................................... 294 
19.4 Port Power .................................................................... 294 