USB 3.2 规范详解

USB

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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
 .......................................................................................................................................... 309 
12.6.3  SuperSpeedPlus Isochronous Transactions ................................................. 310 
12.6.4  Host Flexibility in Performing SuperSpeedPlus Isochronous 
Transactions ............................................................................................................... 311 
12.6.5  Device Response to Isochronous IN Transactions..................................... 312 
12.6.6  Host Processing of Isochronous IN Transactions ...................................... 312 
12.6.7  Device Response to an Isochronous OUT Data Packet ............................ 313 
13  Timing Parameters ................................................................................................................... 313 
Device Framework ............................................................................................................................... 317 
1  USB Device States ..................................................................................................................... 317 
1.1  Visible Device States................................................................................................. 317 
1.1.1  Attached ........................................................................................................................ 320 
1.1.2  Powered ........................................................................................................................ 320 
1.1.3  Default ........................................................................................................................... 321 
1.1.4  Address ......................................................................................................................... 321 
1.1.5  Configured ................................................................................................................... 321 
1.1.6  Suspended ................................................................................................................... 322 
1.1.7  Error ............................................................................................................................... 322 
1.2  Bus Enumeration ....................................................................................................... 322 
2  Generic Device Operations ..................................................................................................... 323 
2.1  Dynamic Attachment and Removal ...................................................................... 323 
2.2  Address Assignment ................................................................................................. 323 
2.3  Configuration .............................................................................................................. 323 
2.4  Data Transfer .............................................................................................................. 324 
2.5  Power Management .................................................................................................. 324 
2.5.1  Power Budgeting ...................................................................................................... 324 
2.5.2  Changing Device Suspend State ......................................................................... 325 
2.5.3  Function Suspend ..................................................................................................... 326 
2.5.4  Changing Function Suspend State ..................................................................... 326 
2.6  Request Processing ................................................................................................... 326 
2.6.1  Request Processing Timing .................................................................................. 327 
2.6.2  Reset/Resume Recovery Time ........................................................................... 327 
2.6.3  Set Address Processing .......................................................................................... 327 
2.6.4  Standard Device Requests .................................................................................... 327 
2.6.5  Class-specific Requests .......................................................................................... 327 
2.6.6  Speed Dependent Descriptors ............................................................................ 328 
2.7  Request Error ............................................................................................................. 328 
3  USB Device Requests ............................................................................................................... 328 

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 ......................................................................................................... 329 
3.2  bRequest....................................................................................................................... 329 
3.3  wValue .......................................................................................................................... 329 
3.4  wIndex .......................................................................................................................... 330 
3.5  wLength ........................................................................................................................ 330 
4  Standard Device Requests ...................................................................................................... 330 
4.1  Clear Feature .............................................................................................................. 333 
4.2  Get Configuration ...................................................................................................... 334 
4.3  Get Descriptor ............................................................................................................ 334 
4.4  Get Interface ............................................................................................................... 335 
4.5  Get Status ..................................................................................................................... 336 
4.6  Set Address .................................................................................................................. 339 
4.7  Set Configuration ....................................................................................................... 341 
4.8  Set Descriptor ............................................................................................................. 341 
4.9  Set Feature................................................................................................................... 342 
4.10  Set Interface ................................................................................................................ 343 
4.11  Set Isochronous Delay .............................................................................................. 344 
4.12  Set SEL .......................................................................................................................... 344 
4.13  Synch Frame ................................................................................................................ 345 
4.14  Set Firmware Status ................................................................................................. 345 
4.15  Get Firmware Status ................................................................................................. 345 
4.16  Events and Their Effect on Device Parameters ................................................ 346 
5  Descriptors ................................................................................................................................. 348 
6  Standard USB Descriptor Definitions ................................................................................. 348 
6.1  Device ............................................................................................................................ 348 
6.2  Binary Device Object Store (BOS) ........................................................................ 350 
6.2.1  USB 2.0 Extension .................................................................................................... 353 
6.2.2  SuperSpeed USB Device Capability .................................................................. 354 
6.2.3  Container ID ................................................................................................................ 356 
6.2.4  Platform Descriptor ................................................................................................. 356 
6.2.5  SuperSpeedPlus USB Device Capability.......................................................... 357 
6.2.6  Precision Time Measurement ............................................................................. 359 
6.2.7  Configuration Summary Descriptor ................................................................. 359 
6.2.8  FWStatus Capability ................................................................................................ 359 
6.3  Configuration .............................................................................................................. 360 
6.4  Interface Association ................................................................................................ 361 
6.5  Interface ....................................................................................................................... 362 
6.6  Endpoint ....................................................................................................................... 364 
6.7  SuperSpeed Endpoint Companion ........................................................................ 367 
6.8  SuperSpeedPlus Isochronous Endpoint Companion ....................................... 369 
6.9  String ............................................................................................................................. 370 
7  Device Class Definitions ......................................................................................................... 371 

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 .................................................................................................................. 371 
7.2  Interface(s) .................................................................................................................. 371 
7.3  Requests ....................................................................................................................... 371 
8  Constants ..................................................................................................................................... 371 
Hub, Host Downstream Port, and Device Upstream Port Specification ............................... 372 
1  Hub Feature Summary............................................................................................................. 372 
1.1  Connecting to an Enhanced SuperSpeed Capable Host .................................. 375 
1.2  Connecting to a USB 2.0 Host ................................................................................. 376 
1.3  Hub Connectivity ....................................................................................................... 376 
1.3.1  Routing Information................................................................................................ 376 
1.3.2  SuperSpeed Hub Packet Signaling Connectivity ......................................... 378 
1.3.3  SuperSpeedPlus Hub Packet Routing .............................................................. 378 
1.4  Resume Connectivity ................................................................................................ 379 
1.5  Hub Fault Recovery Mechanisms .......................................................................... 379 
1.6  Hub Buffer Architecture .......................................................................................... 380 
1.6.1  SuperSpeed Hub Buffer Architecture .............................................................. 380 
1.6.2  SuperSpeedPlus Hub Buffer Architecture ..................................................... 381 
2  Hub Power Management ......................................................................................................... 381 
2.1  Link States ................................................................................................................... 381 
2.2  Hub Downstream Port U1/U2 Timers ................................................................. 381 
2.3  Downstream/Upstream Port Link State Transitions ...................................... 382 
3  Hub Downstream Facing Ports ............................................................................................. 382 
3.1  Hub Downstream Facing Port State Descriptions ........................................... 385 
3.1.1  DSPORT.Powered-off .............................................................................................. 385 
3.1.2  DSPORT.Disconnected (Waiting for eSS Connect) ..................................... 386 
3.1.3  DSPORT.Training ...................................................................................................... 387 
3.1.4  DSPORT.ERROR ......................................................................................................... 387 
3.1.5  DSPORT.Enabled ....................................................................................................... 388 
3.1.6  DSPORT.Resetting .................................................................................................... 388 
3.1.7  DSPORT.Compliance ............................................................................................... 389 
3.1.8  DSPORT.Loopback ................................................................................................... 389 
3.1.9  DSPORT.Disabled ...................................................................................................... 389 
3.1.10  DSPORT.Powered-off-detect ............................................................................... 389 
3.1.11  DSPORT.Powered-off-reset .................................................................................. 390 
3.2  Disconnect Detect Mechanism ............................................................................... 390 
3.3  Labeling ........................................................................................................................ 390 
4  Hub Downstream Facing Port Power Management ........................................................ 391 
4.1  Downstream Facing Port PM Timers ................................................................... 391 
4.2  Hub Downstream Facing Port State Descriptions ........................................... 393 
4.2.1  Enabled U0 States ..................................................................................................... 393 

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 ................................................................................. 394 
4.2.3  Attempt U0 – U2 Transition ................................................................................. 394 
4.2.4  Link in U1 ..................................................................................................................... 395 
4.2.5  Link in U2 ..................................................................................................................... 395 
4.2.6  Link in U3 ..................................................................................................................... 396 
5  Hub Upstream Facing Ports ................................................................................................... 396 
5.1  Upstream Facing Port State Descriptions .......................................................... 397 
5.1.1  USPORT.Powered-off .............................................................................................. 397 
5.1.2  USPORT.Powered-on .............................................................................................. 398 
5.1.3  USPORT.Training ...................................................................................................... 398 
5.1.4  USPORT.Connected/Enabled .............................................................................. 398 
5.1.5  USPORT.Error ............................................................................................................ 398 
5.2  Hub Connect State Machine .................................................................................... 399 
5.2.1  Hub Connect State Descriptions ........................................................................ 399 
5.2.2  HCONNECT.Powered-off ....................................................................................... 399 
5.2.3  HCONNECT.Attempt ESS Connect ..................................................................... 399 
5.2.4  HCONNECT.Connected on ESS ............................................................................ 400 
6  Upstream Facing Port Power Management ....................................................................... 400 
6.1  Upstream Facing Port PM Timer ........................................................................... 402 
6.2  Hub Upstream Facing Port State Descriptions ................................................. 402 
6.2.1  Enabled U0 States ..................................................................................................... 402 
6.2.2  Attempt U0 – U1 Transition ................................................................................. 403 
6.2.3  Attempt U0 – U2 Transition ................................................................................. 404 
6.2.4  Link in U1 ..................................................................................................................... 404 
6.2.5  Link in U2 ..................................................................................................................... 404 
6.2.6  Link in U3 ..................................................................................................................... 404 
7  SuperSpeed Hub Header Packet Forwarding and Data Repeater  .............................. 405 
7.1  SuperSpeed Hub Elasticity Buffer ........................................................................ 405 
7.2  SKP Ordered Sets ....................................................................................................... 405 
7.3  Interpacket Spacing .................................................................................................. 405 
7.4  SuperSpeed Header Packet Buffer Architecture .............................................. 405 
7.5  SuperSpeed Packet Connectivity .......................................................................... 407 
8  SuperSpeedPlus Store and Forward Behavior ................................................................. 407 
8.1  Hub Elasticity Buffer ................................................................................................ 407 
8.2  SKP Ordered Sets ....................................................................................................... 408 
8.3  Interpacket Spacing .................................................................................................. 408 
8.4  Upstream Flowing Buffering .................................................................................. 408 
8.5  Downstream Flowing Buffering ............................................................................ 408 
8.6  SuperSpeedPlus Hub Arbitration of Packets ..................................................... 409 
8.6.1  Arbitration Weight ................................................................................................... 409 

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 ........................................................ 410 
8.6.3  Downstream Flowing Packet Reception and Selection ........................... 410 
8.6.4  Upstream Flowing Packet Reception and Selection .................................. 410 
8.7  SuperSpeedPlus Upstream Flowing Packet Modifications............................ 412 
8.8  SuperSpeedPlus Downstream Controller ........................................................... 413 
9  Port State Machines ................................................................................................................. 413 
9.1  Port Transmit State Machine ................................................................................. 413 
9.2  Port Transmit State Descriptions ......................................................................... 415 
9.2.1  Tx IDLE .......................................................................................................................... 415 
9.2.2  Tx Header ..................................................................................................................... 415 
9.2.3  Tx Data .......................................................................................................................... 415 
9.2.4  Tx Data Abort ............................................................................................................. 415 
9.2.5  Tx Link Command .................................................................................................... 415 
9.3  Port Receive State Machine .................................................................................... 416 
9.4  Port Receive State Descriptions ............................................................................ 416 
9.4.1  Rx Default ..................................................................................................................... 416 
9.4.2  Rx Data .......................................................................................................................... 417 
9.4.3  Rx Header ..................................................................................................................... 417 
9.4.4  Process Header Packet ........................................................................................... 417 
9.4.5  Rx Link Command .................................................................................................... 422 
9.4.6  Process Link Command ......................................................................................... 422 
10 Suspend and Resume ............................................................................................................... 423 
11 Hub Upstream Port Reset Behavior .................................................................................... 423 
12 Hub Port Power Control ......................................................................................................... 424 
12.1 Multiple Gangs (Only supported for downstream USB Standard-A ports)
 ......................................................................................................................................... 424 
13 Hub Controller ........................................................................................................................... 425 
13.1 Endpoint Organization ............................................................................................. 425 
13.2 Hub Information Architecture and Operation .................................................. 426 
13.3 Port Change Information Processing ................................................................... 427 
13.4 Hub and Port Status Change Bitmap .................................................................... 427 
13.5 Over-current Reporting and Recovery ................................................................ 428 
13.6 Enumeration Handling ............................................................................................. 429 
14 Hub Configuration .................................................................................................................... 429 
15 Descriptors ................................................................................................................................. 431 
15.1 Standard Descriptors for Hub Class..................................................................... 432 
15.2 Class-specific Descriptors ....................................................................................... 437 
15.2.1  Hub Descriptor .......................................................................................................... 437 
16 Requests ...................................................................................................................................... 439 
16.1 Standard Requests .................................................................................................... 439 
16.2 Class-specific Requests ............................................................................................ 439 