"USB 3.2规范与产品开发要求"

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USB 3.2 Specification是由USB 3.0推广组（USB 3.0 Promoter Group）于2022年发布的一项规范。该规范是关于Universal Serial Bus（通用串行总线）的技术标准，旨在提供更快的数据传输速度和更强大的功能。 USB 3.2规范要求产品开发人员必须了解和理解USB 2.0规范，因为USB 3.x设备必须实现USB 2.0规范中定义的设备框架命令和描述符。换言之，USB 3.2兼容USB 2.0，并且可以与USB 2.0设备进行互操作。这使得用户可以在USB 3.2设备上使用USB 2.0设备，无需添加额外的适配器或转换器。根据USB 3.2规范，以10Gbps运行的设备（也称为Gen 2）必须实现SuperSpeedPlus增强功能。这些增强功能包括更高的数据传输速率、更低的延迟和更大的带宽。这使得USB 3.2设备比USB 2.0设备更适合处理大容量文件传输、高清视频流媒体和其他高带宽应用。 USB 3.2规范由USB 3.0推广组的成员共同制定，其中包括著名的公司如Apple Inc.、Hewlett-Packard Inc.、Intel Corporation、Microsoft Corporation、Renesas Corporation、STMicroelectronics和Texas Instruments。这些公司的专业知识和经验对于制定一个全面且实用的规范至关重要。 USB 3.2规范的发行日期为2022年6月，此前于2017年9月发布了1.1版。规范的修订历史表明，该规范经过了多次修改和改进，以确保其与最新的技术趋势和需求保持一致。这表明USB 3.2规范是一个不断演进的标准，以适应日益增长的数据传输和设备连接需求。总之，USB 3.2规范是一个为USB技术提供指导和标准的文档。它要求USB 3.x设备兼容USB 2.0，并具有SuperSpeedPlus增强功能。该规范由多家知名公司共同制定，并经过多次修订以确保其与最新的技术趋势保持一致。通过遵循USB 3.2规范，产品开发人员和用户可以获得更快的数据传输速度和更强大的功能，从而提高工作效率和用户体验。

Revision 1.1  - xvi -  Universal Serial Bus 3.2 
June 2022    Specification 
Copyright © 2022 USB 3.0 Promoter Group.  All rights reserved. 
12.6.2  Host Flexibility in Performing SuperSpeed Isochronous Transactions
 .......................................................................................................................................... 310 
12.6.3  SuperSpeedPlus Isochronous Transactions ................................................. 311 
12.6.4  Host Flexibility in Performing SuperSpeedPlus Isochronous 
Transactions ............................................................................................................... 312 
12.6.5  Device Response to Isochronous IN Transactions..................................... 313 
12.6.6  Host Processing of Isochronous IN Transactions ...................................... 313 
12.6.7  Device Response to an Isochronous OUT Data Packet ............................ 314 
13  Timing Parameters ................................................................................................................... 314 
Device Framework ............................................................................................................................... 318 
1  USB Device States ..................................................................................................................... 318 
1.1  Visible Device States................................................................................................. 318 
1.1.1  Attached ........................................................................................................................ 321 
1.1.2  Powered ........................................................................................................................ 321 
1.1.3  Default ........................................................................................................................... 322 
1.1.4  Address ......................................................................................................................... 322 
1.1.5  Configured ................................................................................................................... 322 
1.1.6  Suspended ................................................................................................................... 323 
1.1.7  Error ............................................................................................................................... 323 
1.2  Bus Enumeration ....................................................................................................... 323 
2  Generic Device Operations ..................................................................................................... 324 
2.1  Dynamic Attachment and Removal ...................................................................... 324 
2.2  Address Assignment ................................................................................................. 324 
2.3  Configuration .............................................................................................................. 324 
2.4  Data Transfer .............................................................................................................. 325 
2.5  Power Management .................................................................................................. 325 
2.5.1  Power Budgeting ...................................................................................................... 325 
2.5.2  Changing Device Suspend State ......................................................................... 326 
2.5.3  Function Suspend ..................................................................................................... 327 
2.5.4  Changing Function Suspend State ..................................................................... 327 
2.6  Request Processing ................................................................................................... 327 
2.6.1  Request Processing Timing .................................................................................. 328 
2.6.2  Reset/Resume Recovery Time ........................................................................... 328 
2.6.3  Set Address Processing .......................................................................................... 328 
2.6.4  Standard Device Requests .................................................................................... 328 
2.6.5  Class-specific Requests .......................................................................................... 328 
2.6.6  Speed Dependent Descriptors ............................................................................ 329 
2.7  Request Error ............................................................................................................. 329 
3  USB Device Requests ............................................................................................................... 329 

Revision 1.1  - xvii -  Universal Serial Bus 3.2 
June 2022    Specification 
Copyright © 2022 USB 3.0 Promoter Group.  All rights reserved. 
3.1  bmRequestType ......................................................................................................... 330 
3.2  bRequest....................................................................................................................... 330 
3.3  wValue .......................................................................................................................... 330 
3.4  wIndex .......................................................................................................................... 331 
3.5  wLength ........................................................................................................................ 331 
4  Standard Device Requests ...................................................................................................... 331 
4.1  Clear Feature .............................................................................................................. 334 
4.2  Get Configuration ...................................................................................................... 335 
4.3  Get Descriptor ............................................................................................................ 335 
4.4  Get Interface ............................................................................................................... 336 
4.5  Get Status ..................................................................................................................... 337 
4.6  Set Address .................................................................................................................. 340 
4.7  Set Configuration ....................................................................................................... 342 
4.8  Set Descriptor ............................................................................................................. 342 
4.9  Set Feature................................................................................................................... 343 
4.10  Set Interface ................................................................................................................ 344 
4.11  Set Isochronous Delay .............................................................................................. 345 
4.12  Set SEL .......................................................................................................................... 345 
4.13  Synch Frame ................................................................................................................ 346 
4.14  Set Firmware Status ................................................................................................. 346 
4.15  Get Firmware Status ................................................................................................. 346 
4.16  Events and Their Effect on Device Parameters ................................................ 347 
5  Descriptors ................................................................................................................................. 349 
6  Standard USB Descriptor Definitions ................................................................................. 349 
6.1  Device ............................................................................................................................ 349 
6.2  Binary Device Object Store (BOS) ........................................................................ 351 
6.2.1  USB 2.0 Extension .................................................................................................... 354 
6.2.2  SuperSpeed USB Device Capability .................................................................. 355 
6.2.3  Container ID ................................................................................................................ 357 
6.2.4  Platform Descriptor ................................................................................................. 357 
6.2.5  SuperSpeedPlus USB Device Capability.......................................................... 358 
6.2.6  Precision Time Measurement ............................................................................. 360 
6.2.7  Configuration Summary Descriptor ................................................................. 360 
6.2.8  FWStatus Capability ................................................................................................ 360 
6.3  Configuration .............................................................................................................. 361 
6.4  Interface Association ................................................................................................ 362 
6.5  Interface ....................................................................................................................... 363 
6.6  Endpoint ....................................................................................................................... 365 
6.7  SuperSpeed Endpoint Companion ........................................................................ 368 
6.8  SuperSpeedPlus Isochronous Endpoint Companion ....................................... 370 
6.9  String ............................................................................................................................. 371 
7  Device Class Definitions ......................................................................................................... 372 

Revision 1.1  - xviii -  Universal Serial Bus 3.2 
June 2022    Specification 
Copyright © 2022 USB 3.0 Promoter Group.  All rights reserved. 
7.1  Descriptors .................................................................................................................. 372 
7.2  Interface(s) .................................................................................................................. 372 
7.3  Requests ....................................................................................................................... 372 
8  Constants ..................................................................................................................................... 372 
Hub, Host Downstream Port, and Device Upstream Port Specification ............................... 373 
1  Hub Feature Summary............................................................................................................. 373 
1.1  Connecting to an Enhanced SuperSpeed Capable Host .................................. 376 
1.2  Connecting to a USB 2.0 Host ................................................................................. 377 
1.3  Hub Connectivity ....................................................................................................... 377 
1.3.1  Routing Information................................................................................................ 377 
1.3.2  SuperSpeed Hub Packet Signaling Connectivity ......................................... 379 
1.3.3  SuperSpeedPlus Hub Packet Routing .............................................................. 379 
1.4  Resume Connectivity ................................................................................................ 380 
1.5  Hub Fault Recovery Mechanisms .......................................................................... 380 
1.6  Hub Buffer Architecture .......................................................................................... 381 
1.6.1  SuperSpeed Hub Buffer Architecture .............................................................. 381 
1.6.2  SuperSpeedPlus Hub Buffer Architecture ..................................................... 382 
2  Hub Power Management ......................................................................................................... 382 
2.1  Link States ................................................................................................................... 382 
2.2  Hub Downstream Port U1/U2 Timers ................................................................. 382 
2.3  Downstream/Upstream Port Link State Transitions ...................................... 383 
3  Hub Downstream Facing Ports ............................................................................................. 383 
3.1  Hub Downstream Facing Port State Descriptions ........................................... 386 
3.1.1  DSPORT.Powered-off .............................................................................................. 386 
3.1.2  DSPORT.Disconnected (Waiting for eSS Connect) ..................................... 387 
3.1.3  DSPORT.Training ...................................................................................................... 388 
3.1.4  DSPORT.ERROR ......................................................................................................... 388 
3.1.5  DSPORT.Enabled ....................................................................................................... 389 
3.1.6  DSPORT.Resetting .................................................................................................... 389 
3.1.7  DSPORT.Compliance ............................................................................................... 390 
3.1.8  DSPORT.Loopback ................................................................................................... 390 
3.1.9  DSPORT.Disabled ...................................................................................................... 390 
3.1.10  DSPORT.Powered-off-detect ............................................................................... 390 
3.1.11  DSPORT.Powered-off-reset .................................................................................. 391 
3.2  Disconnect Detect Mechanism ............................................................................... 391 
3.3  Labeling ........................................................................................................................ 391 
4  Hub Downstream Facing Port Power Management ........................................................ 392 
4.1  Downstream Facing Port PM Timers ................................................................... 392 
4.2  Hub Downstream Facing Port State Descriptions ........................................... 394 
4.2.1  Enabled U0 States ..................................................................................................... 394 

Revision 1.1  - xix -  Universal Serial Bus 3.2 
June 2022    Specification 
Copyright © 2022 USB 3.0 Promoter Group.  All rights reserved. 
4.2.2  Attempt U0 – U1 Transition ................................................................................. 395 
4.2.3  Attempt U0 – U2 Transition ................................................................................. 395 
4.2.4  Link in U1 ..................................................................................................................... 396 
4.2.5  Link in U2 ..................................................................................................................... 396 
4.2.6  Link in U3 ..................................................................................................................... 397 
5  Hub Upstream Facing Ports ................................................................................................... 397 
5.1  Upstream Facing Port State Descriptions .......................................................... 398 
5.1.1  USPORT.Powered-off .............................................................................................. 398 
5.1.2  USPORT.Powered-on .............................................................................................. 399 
5.1.3  USPORT.Training ...................................................................................................... 399 
5.1.4  USPORT.Connected/Enabled .............................................................................. 399 
5.1.5  USPORT.Error ............................................................................................................ 399 
5.2  Hub Connect State Machine .................................................................................... 400 
5.2.1  Hub Connect State Descriptions ........................................................................ 400 
5.2.2  HCONNECT.Powered-off ....................................................................................... 400 
5.2.3  HCONNECT.Attempt ESS Connect ..................................................................... 400 
5.2.4  HCONNECT.Connected on ESS ............................................................................ 401 
6  Upstream Facing Port Power Management ....................................................................... 401 
6.1  Upstream Facing Port PM Timer ........................................................................... 403 
6.2  Hub Upstream Facing Port State Descriptions ................................................. 403 
6.2.1  Enabled U0 States ..................................................................................................... 403 
6.2.2  Attempt U0 – U1 Transition ................................................................................. 404 
6.2.3  Attempt U0 – U2 Transition ................................................................................. 405 
6.2.4  Link in U1 ..................................................................................................................... 405 
6.2.5  Link in U2 ..................................................................................................................... 405 
6.2.6  Link in U3 ..................................................................................................................... 405 
7  SuperSpeed Hub Header Packet Forwarding and Data Repeater  .............................. 406 
7.1  SuperSpeed Hub Elasticity Buffer ........................................................................ 406 
7.2  SKP Ordered Sets ....................................................................................................... 406 
7.3  Interpacket Spacing .................................................................................................. 406 
7.4  SuperSpeed Header Packet Buffer Architecture .............................................. 406 
7.5  SuperSpeed Packet Connectivity .......................................................................... 408 
8  SuperSpeedPlus Store and Forward Behavior ................................................................. 408 
8.1  Hub Elasticity Buffer ................................................................................................ 408 
8.2  SKP Ordered Sets ....................................................................................................... 409 
8.3  Interpacket Spacing .................................................................................................. 409 
8.4  Upstream Flowing Buffering .................................................................................. 409 
8.5  Downstream Flowing Buffering ............................................................................ 409 
8.6  SuperSpeedPlus Hub Arbitration of Packets ..................................................... 410 
8.6.1  Arbitration Weight ................................................................................................... 410 

Revision 1.1  - xx -  Universal Serial Bus 3.2 
June 2022    Specification 
Copyright © 2022 USB 3.0 Promoter Group.  All rights reserved. 
8.6.2  Direction Independent Packet Selection ........................................................ 411 
8.6.3  Downstream Flowing Packet Reception and Selection ........................... 411 
8.6.4  Upstream Flowing Packet Reception and Selection .................................. 411 
8.7  SuperSpeedPlus Upstream Flowing Packet Modifications............................ 413 
8.8  SuperSpeedPlus Downstream Controller ........................................................... 414 
9  Port State Machines ................................................................................................................. 414 
9.1  Port Transmit State Machine ................................................................................. 414 
9.2  Port Transmit State Descriptions ......................................................................... 416 
9.2.1  Tx IDLE .......................................................................................................................... 416 
9.2.2  Tx Header ..................................................................................................................... 416 
9.2.3  Tx Data .......................................................................................................................... 416 
9.2.4  Tx Data Abort ............................................................................................................. 416 
9.2.5  Tx Link Command .................................................................................................... 416 
9.3  Port Receive State Machine .................................................................................... 417 
9.4  Port Receive State Descriptions ............................................................................ 417 
9.4.1  Rx Default ..................................................................................................................... 417 
9.4.2  Rx Data .......................................................................................................................... 418 
9.4.3  Rx Header ..................................................................................................................... 418 
9.4.4  Process Header Packet ........................................................................................... 418 
9.4.5  Rx Link Command .................................................................................................... 423 
9.4.6  Process Link Command ......................................................................................... 423 
10 Suspend and Resume ............................................................................................................... 424 
11 Hub Upstream Port Reset Behavior .................................................................................... 424 
12 Hub Port Power Control ......................................................................................................... 425 
12.1 Multiple Gangs (Only supported for downstream USB Standard-A ports)
 ......................................................................................................................................... 425 
13 Hub Controller ........................................................................................................................... 426 
13.1 Endpoint Organization ............................................................................................. 426 
13.2 Hub Information Architecture and Operation .................................................. 427 
13.3 Port Change Information Processing ................................................................... 428 
13.4 Hub and Port Status Change Bitmap .................................................................... 428 
13.5 Over-current Reporting and Recovery ................................................................ 429 
13.6 Enumeration Handling ............................................................................................. 430 
14 Hub Configuration .................................................................................................................... 430 
15 Descriptors ................................................................................................................................. 432 
15.1 Standard Descriptors for Hub Class..................................................................... 433 
15.2 Class-specific Descriptors ....................................................................................... 438 
15.2.1  Hub Descriptor .......................................................................................................... 438 
16 Requests ...................................................................................................................................... 440 
16.1 Standard Requests .................................................................................................... 440 
16.2 Class-specific Requests ............................................................................................ 440 

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