USB Type-C SPEC

【核心代码】

CONTENTS
Specification Work Group Chairs / Specification Editors ....................................................16
Specification Work Group Contributors ....................................................................................16
Pre-Release Draft Industry Reviewing Companies That Provided Feedback .................22
Revision History ................................................................................................................................22
1 Introduction ...............................................................................................................................23
1.1 Purpose ............................................................................................................................23
1.2 Scope.................................................................................................................................23
1.3 Related Documents.......................................................................................................24
1.4 Conventions ....................................................................................................................24
1.4.1 Precedence ......................................................................................................24
1.4.2 Keywords .........................................................................................................24
1.4.3 Numbering .......................................................................................................25
1.5 Terms and Abbreviations ...........................................................................................25
2 Overview .....................................................................................................................................30
2.1 Introduction ...................................................................................................................30
2.2 USB Type-C Receptacles, Plugs and Cables ...........................................................31
2.3 Configuration Process .................................................................................................32
2.3.1 Source-to-Sink Attach/Detach Detection ...............................................33
2.3.2 Plug Orientation/Cable Twist Detection ................................................33
2.3.3 Initial Power (Source-to-Sink) Detection and Establishing the Data
(Host-to-Device) Relationship...................................................................33
2.3.4 USB Type-C VBUS Current Detection and Usage ...................................34
2.3.5 USB PD Communication...............................................................................35
2.3.6 Functional Extensions ..................................................................................35
2.4 VBUS ...................................................................................................................................35
2.5 VCONN ................................................................................................................................36
2.6 Hubs ..................................................................................................................................36
3 Mechanical ..................................................................................................................................37
3.1 Overview .........................................................................................................................37
3.1.1 Compliant Connectors ..................................................................................37
3.1.2 Compliant Cable Assemblies ......................................................................37
3.1.3 Compliant USB Type-C to Legacy Cable Assemblies ...........................37
3.1.4 Compliant USB Type-C to Legacy Adapter Assemblies ......................38
3.2 USB Type-C Connector Mating Interfaces .............................................................39
3.2.1 Interface Definition.......................................................................................39
3.2.2 Reference Designs .........................................................................................61
3.2.3 Pin Assignments and Descriptions ...........................................................68
3.3 Cable Construction and Wire Assignments ...........................................................69
3.3.1 Cable Construction (Informative) ............................................................69
3.3.2 Wire Assignments .........................................................................................71
3.3.3 Wire Gauges and Cable Diameters (Informative)................................72
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3.4 Standard USB Type-C Cable Assemblies ................................................................74
3.4.1 USB Full-Featured Type-C Cable Assembly ...........................................74
3.4.2 USB 2.0 Type-C Cable Assembly................................................................75
3.4.3 USB Type-C Captive Cable Assemblies ....................................................76
3.5 Legacy Cable Assemblies ............................................................................................76
3.5.1 USB Type-C to USB 3.1 Standard-A Cable Assembly ...........................77
3.5.2 USB Type-C to USB 2.0 Standard-A Cable Assembly ...........................78
3.5.3 USB Type-C to USB 3.1 Standard-B Cable Assembly ...........................79
3.5.4 USB Type-C to USB 2.0 Standard-B Cable Assembly ...........................80
3.5.5 USB Type-C to USB 2.0 Mini-B Cable Assembly ....................................81
3.5.6 USB Type-C to USB 3.1 Micro-B Cable Assembly..................................82
3.5.7 USB Type-C to USB 2.0 Micro-B Cable Assembly..................................84
3.6 Legacy Adapter Assemblies .......................................................................................85
3.6.1 USB Type-C to USB 3.1 Standard-A Receptacle Adapter Assembly 85
3.6.2 USB Type-C to USB 2.0 Micro-B Receptacle Adapter Assembly.......87
3.7 Electrical Characteristics ...........................................................................................88
3.7.1 Raw Cable (Informative).............................................................................88
3.7.2 USB Type-C to Type-C Passive Cable Assemblies (Normative) .......89
3.7.3 Mated Connector (Informative – USB 3.2 Gen2 and USB4 Gen2) 108
3.7.4 Mated Connector (Normative – USB4 Gen3)...................................... 112
3.7.5 USB Type-C to Legacy Cable Assemblies (Normative) .................... 113
3.7.6 USB Type-C to USB Legacy Adapter Assemblies (Normative) ...... 117
3.7.7 Shielding Effectiveness Requirements (Normative)........................ 119
3.7.8 DC Electrical Requirements (Normative) ........................................... 122
3.8 Mechanical and Environmental Requirements (Normative)........................ 125
3.8.1 Mechanical Requirements........................................................................ 126
3.8.2 Environmental Requirements................................................................. 131
3.9 Docking Applications (Informative) .................................................................... 132
3.10 Implementation Notes and Design Guides ......................................................... 133
3.10.1 EMC Management (Informative)............................................................ 133
3.10.2 Stacked and Side-by-Side Connector Physical Spacing (Informative)
.......................................................................................................................... 136
3.10.3 Cable Mating Considerations (Informative)....................................... 136
4 Functional ................................................................................................................................ 138
4.1 Signal Summary.......................................................................................................... 138
4.2 Signal Pin Descriptions ............................................................................................ 138
4.2.1 SuperSpeed USB Pins ................................................................................ 138
4.2.2 USB 2.0 Pins ................................................................................................. 139
4.2.3 Auxiliary Signal Pins.................................................................................. 139
4.2.4 Power and Ground Pins ............................................................................ 139
4.2.5 Configuration Pins ..................................................................................... 139
4.3 Sideband Use (SBU)................................................................................................... 139
4.4 Power and Ground..................................................................................................... 140
4.4.1 IR Drop........................................................................................................... 140
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4.4.2 VBUS................................................................................................................. 141
4.4.3 VCONN.............................................................................................................. 143
4.5 Configuration Channel (CC).................................................................................... 147
4.5.1 Architectural Overview ............................................................................ 147
4.5.2 CC Functional and Behavioral Requirements .................................... 161
4.5.3 USB Port Interoperability Behavior ...................................................... 197
4.6 Power............................................................................................................................. 216
4.6.1 Power Requirements during USB Suspend ......................................... 217
4.6.2 VBUS Power Provided Over a USB Type-C Cable ............................... 218
4.7 USB Hubs ...................................................................................................................... 224
4.8 Power Sourcing and Charging ................................................................................ 224
4.8.1 DFP as a Power Source ............................................................................. 224
4.8.2 Non-USB Charging Methods .................................................................... 227
4.8.3 Sinking Host ................................................................................................. 227
4.8.4 Sourcing Device........................................................................................... 227
4.8.5 Charging a System with a Dead Battery .............................................. 227
4.8.6 USB Type-C Multi-Port Chargers ........................................................... 228
4.9 Electronically Marked Cables ................................................................................. 231
4.9.1 Parameter Values ....................................................................................... 232
4.9.2 Active Cables ................................................................................................ 232
4.10 VCONN-Powered Accessories (VPAs) and VCONN-Powered USB Devices
(VPDs) ........................................................................................................................... 232
4.10.1 VCONN-Powered Accessories (VPAs)..................................................... 233
4.10.2 VCONN-Powered USB Devices (VPDs) ................................................... 233
4.11 Parameter Values ....................................................................................................... 235
4.11.1 Termination Parameters .......................................................................... 235
4.11.2 Timing Parameters..................................................................................... 237
4.11.3 Voltage Parameters.................................................................................... 240
5 USB4 Discovery and Entry .................................................................................................. 242
5.1 Overview of the Discovery and Entry Process .................................................. 242
5.2 USB4 Functional Requirements ............................................................................. 243
5.2.1 USB4 Host Functional Requirements ................................................... 243
5.2.2 USB4 Device Functional Requirements ............................................... 243
5.2.3 USB4 Alternate Mode Support................................................................ 243
5.2.3.1 USB4 Alternate Mode Support on Hosts .............................................. 243
5.2.3.2 USB4 Alternate Mode Support on Hubs and USB4-based Docks.. 243
5.3 USB4 Power Requirements ..................................................................................... 244
5.3.1 Source Power Requirements ................................................................... 244
5.3.2 Sink Power Requirements ....................................................................... 244
5.3.3 Device Power Management Requirements ......................................... 245
5.4 USB4 Discovery and Entry Flow Requirements ............................................... 245
5.4.1 USB Type-C Initial Connection ............................................................... 245
5.4.2 USB Power Delivery Contract ................................................................. 245
5.4.3 USB4 Discovery and Entry Flow ............................................................ 246
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5.4.3.1 USB4 Device Discovery (SOP)................................................................. 246
5.4.3.2 USB4 Cable Discovery (SOP’).................................................................. 247
5.4.3.3 USB4 Operational Entry ........................................................................... 249
5.4.4 USB4 Post-Entry Operation ..................................................................... 249
5.4.4.1 During USB4 Operation ............................................................................ 249
5.4.4.2 Exiting USB4 Operation ............................................................................ 250
5.5 USB4 Hub Connection Requirements .................................................................. 250
5.5.1 USB4 Hub Port Initial Connection Requirements ............................. 250
5.5.2 USB4 Hub UFP and Host Capabilities Discovery ............................... 250
5.5.3 Hub DFP Connection Requirements...................................................... 251
5.5.3.1 Speculative Connections .......................................................................... 251
5.5.3.2 Operational Connections .......................................................................... 251
5.5.4 Hub Ports Connection Behavior Flow Model ..................................... 252
5.5.5 Connecting to Downstream USB4 Hubs ............................................... 258
5.5.6 Fallback Functional Requirements for USB4 Hubs .......................... 258
5.6 USB4 Device Connection Requirements ............................................................. 259
5.6.1 Fallback Mapping of USB4 Peripheral Functions to USB Device
Class Types ................................................................................................... 259
5.7 Parameter Values ....................................................................................................... 260
5.7.1 Timing Parameters..................................................................................... 260
6 Active Cables ........................................................................................................................... 261
6.1 USB Type-C State Machine ...................................................................................... 262
6.2 USB PD Requirements .............................................................................................. 263
6.2.1 Active Cable USB PD Requirements ...................................................... 264
6.2.2 USB PD Messages for OIAC ...................................................................... 264
6.2.3 Short Active Cable Behaviors in Response to Power Delivery
Events............................................................................................................. 276
6.3 OIAC Connection Flow and State Diagrams ....................................................... 276
6.3.1 OIAC Connection Flow – Discovery – Phase 1 ................................... 277
6.3.2 OIAC Connection Flow – Reboot – Phase 2 ......................................... 278
6.3.3 OIAC Connection Flow – Configuration – Phase 3 ............................ 279
6.3.4 OIAC Connection State Diagram Master .............................................. 282
6.3.5 OIAC Connection State Diagram Slave ................................................. 290
6.4 Active Cable Power Requirements ....................................................................... 295
6.4.1 VBUS Requirements .................................................................................... 295
6.4.2 OIAC VBUS Requirements.......................................................................... 295
6.4.3 USB PD Rules in Active State .................................................................. 297
6.4.4 VCONN Requirements ................................................................................. 298
6.5 Mechanical ................................................................................................................... 298
6.5.1 Thermal ......................................................................................................... 298
6.5.2 Plug Spacing ................................................................................................. 299
6.6 Electrical Requirements .......................................................................................... 299
6.6.1 Shielding Effectiveness Requirement................................................... 299
6.6.2 Low Speed Signal Requirement.............................................................. 299
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6.6.3 USB 2.0........................................................................................................... 300
6.6.4 USB 3.2........................................................................................................... 301
6.6.5 Return Loss .................................................................................................. 308
6.7 Active Cables That Support Alternate Modes .................................................... 308
6.7.1 Discover SVIDs ............................................................................................ 308
6.7.2 Discover Modes ........................................................................................... 308
6.7.3 Enter/Exit Modes ....................................................................................... 308
6.7.4 Power in Alternate Modes ....................................................................... 308
A Audio Adapter Accessory Mode ........................................................................................ 309
A.1 Overview ...................................................................................................................... 309
A.2 Detail ............................................................................................................................. 309
A.3 Electrical Requirements .......................................................................................... 310
A.4 Example Implementations ...................................................................................... 312
A.4.1 Passive 3.5 mm to USB Type-C Adapter – Single Pole Detection
Switch............................................................................................................. 312
A.4.2 3.5 mm to USB Type-C Adapter Supporting 500 mA ChargeThrough ......................................................................................................... 312
B Debug Accessory Mode ........................................................................................................ 314
B.1 Overview ...................................................................................................................... 314
B.2 Functional .................................................................................................................... 314
B.2.1 Signal Summary .......................................................................................... 315
B.2.2 Port Interoperability ................................................................................. 315
B.2.3 Debug Accessory Mode Entry ................................................................. 315
B.2.4 Connection State Diagrams ..................................................................... 316
B.2.5 DTS Port Interoperability Behavior ...................................................... 325
B.2.6 Orientation Detection ............................................................................... 334
B.3 Security/Privacy Requirements: ........................................................................... 335
C USB Type-C Digital Audio.................................................................................................... 336
C.1 Overview ...................................................................................................................... 336
C.2 USB Type-C Digital Audio Specifications ............................................................ 336
D Thermal Design Considerations for Active Cables ...................................................... 338
D.1 Introduction ................................................................................................................ 338
D.2 Model ............................................................................................................................. 338
D.2.1 Assumptions................................................................................................. 338
D.2.2 Model Architecture .................................................................................... 339
D.2.3 Heat Sources ................................................................................................ 340
D.2.4 Heat Flow ...................................................................................................... 340
D.3 USB 3.2 Single Lane Active Cable .......................................................................... 341
D.3.1 USB 3.2 Single-Lane Active Cable Design Considerations .............. 341
D.4 Dual-Lane Active Cables .......................................................................................... 344
D.4.1 USB 3.2 Dual-Lane Active Cable Design Considerations ................ 344
D.4.2 USB 3.2 Dual-Lane Active Cable in a Multi-Port Configuration.... 346
D.5 USB 3.2 Host and Device Design Considerations ............................................. 348
D.5.1 Heat Spreading or Heat Sinking from Host or Device ..................... 348
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D.5.2 Motherboard Temperature Control ...................................................... 349
D.5.3 Wider Port Spacing for Multi-Port Applications ............................... 349
D.5.4 Power Policies ............................................................................................. 349
E Alternate Modes ..................................................................................................................... 350
E.1 Alternate Mode Architecture.................................................................................. 350
E.2 Alternate Mode Requirements ............................................................................... 350
E.2.1 Alternate Mode Pin Reassignment ........................................................ 351
E.2.2 Alternate Mode Electrical Requirements ............................................ 352
E.3 Parameter Values ....................................................................................................... 354
E.4 Example Alternate Mode – USB DisplayPort™ Dock ....................................... 355
E.4.1 USB DisplayPort Dock Example ............................................................. 355
E.4.2 Functional Overview ................................................................................. 356
E.4.3 Operational Summary ............................................................................... 357
F Thunderbolt 3 Compatibility Discovery and Entry ..................................................... 359
F.1 TBT3 Compatibility Mode Functional Requirements ..................................... 359
F.1.1 TBT3-Compatible Power Requirements .............................................. 359
F.1.2 TBT3-Compatible Host Requirements ................................................. 359
F.1.3 TBT3-Compatible Device Upstream Requirements ......................... 359
F.1.4 TBT3-Compatible Device Downstream Requirements.................... 359
F.1.5 TBT3-Compatible Self-Powered Device Without Predefined
Upstream Port Rules.................................................................................. 360
F.1.6 TBT3-Compatible Devices with a Captive Cable ............................... 360
F.2 TBT3 Discovery and Entry Flow ........................................................................... 360
F.2.1 TBT3 Passive Cable Discover Identity Responses ............................ 362
F.2.2 TBT3 Active Cable Discover Identity Responses .............................. 364
F.2.3 TBT3 Device Discover Identity Responses ......................................... 367
F.2.4 TBT3 Discover SVID Responses ............................................................. 368
F.2.5 TBT3 Device Discover Mode Responses .............................................. 369
F.2.6 TBT3 Cable Discover Mode Responses ................................................ 370
F.2.7 TBT3 Cable Enter Mode Command ....................................................... 371
F.2.8 TBT3 Device Enter Mode Command ..................................................... 372
F.2.9 TBT3 Cable Functional Difference Summary ..................................... 373