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Proposed DisplayPort Alt Mode on USB Type-C

V1, d3

Page 1 of 83

DISTRIBUTION TO NON-MEMBERS IS PROHIBITED

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5127

URL:

www.vesa.org

Proposed DisplayPort Alt

Mode on USB Type-C

Standard

Version 1, Draft 3

28 July,

2014

Purpose

The purpose of this document is to specify the use of DisplayPort as an Alternate Mode for the USB

Type-C connector.

Summary

This standard describes the use of the DisplayPort protocol between devices that support the USB Type-

C connector using USB Type-C to USB Type-C Cable Assemblies. It describes cable assemblies that

adapt the USB Type-C connector to Legacy DisplayPort connectors. It describes cable assemblies and

adapters to adapt DisplayPort on USB Type-C to other video protocols. It describes the simultaneous use

of USB Enhanced SuperSpeed and the DisplayPort protocol on the USB Type-C connector for docking

applications.

This standard describes the USB Type-C connector pin assignments and DisplayPort signaling rates to

be used in various scenarios when using the above cable assemblies and adapters. It describes how the

USB-PD Alternate Mode Discovery and Entry Processes are applied to DisplayPort on the USB Type-C

connector.

Proposed DisplayPort Alt Mode on USB Type-C

V1, d3

Page 2 of 83

DISTRIBUTION TO NON-MEMBERS IS PROHIBITED

Contents

Purpose .......................................................................................................................................................... 1

Summary ........................................................................................................................................................ 1

Contents ........................................................................................................................................................ 2

Figures .......................................................................................................................................................... 5

Tables ............................................................................................................................................................ 6

Preface .......................................................................................................................................................... 7

Intellectual Property ................................................................................................................................. 7

Trademarks .............................................................................................................................................. 7

Patents ..................................................................................................................................................... 8

Support for this Standard ........................................................................................................................... 8

Acknowledgements ................................................................................................................................... 8

Revision History ..................................................................................................................................... 10

1 Introduction ........................................................................................................................................... 11

1.1 Purpose ........................................................................................................................................ 11

1.2 Scope ........................................................................................................................................... 11

1.3 Related Documents ...................................................................................................................... 12

1.4 Conventions ................................................................................................................................. 12

1.4.1 Precedence ...................................................................................................................... 12

1.4.2 Keywords ........................................................................................................................ 12

1.4.3 Numbering ...................................................................................................................... 13

1.5 Terms and Abbreviations ............................................................................................................. 13

2 Overview ............................................................................................................................................... 15

2.1 Introduction ................................................................................................................................. 15

2.2 USB Type-C Receptacles, Plugs and Cables ................................................................................. 15

2.3 Signaling and cable types ............................................................................................................. 15

2.4 Multi-Function systems ................................................................................................................ 16

3 Pin Assignments and Descriptions .......................................................................................................... 17

3.1 Pin Assignments Overview ........................................................................................................... 17

3.2 USB Type-C DisplayPort Pin Assignments ................................................................................... 18

3.2.1 Pinout Assignment support requirements ......................................................................... 19

3.3 DFP_D Pin Assignment A ............................................................................................................ 21

3.4 DFP_D Pin Assignment B ............................................................................................................ 21

3.5 DFP_D Pin Assignment C ............................................................................................................ 22

3.6 DFP_D Pin Assignment D ............................................................................................................ 23

3.7 DFP_D Pin Assignment E ............................................................................................................ 24

3.8 DFP_D Pin Assignment F............................................................................................................. 26

3.9 UFP_D Pin Assignment A ............................................................................................................ 27

3.10 UFP_D Pin Assignment B ........................................................................................................... 28

3.11 UFP_D Pin Assignment C ........................................................................................................... 28

3.12 UFP_D Pin Assignment D ........................................................................................................... 29

3.13 UFP_D Pin Assignment E ........................................................................................................... 30

3.14 USB Gen 2 PHY signaling for DisplayPort (GEN2_BR) .............................................................. 31

3.15 AUX and HPD signaling ............................................................................................................. 31

Proposed DisplayPort Alt Mode on USB Type-C

V1, d3

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DISTRIBUTION TO NON-MEMBERS IS PROHIBITED

3.15.1 AUX signaling ............................................................................................................... 31

3.15.2 HPD signaling ................................................................................................................ 32

3.15.3 AUX and HPD schematics .............................................................................................. 32

3.16 Legacy DisplayPort Connector CONFIG1 and CONFIG2 pins ..................................................... 35

4 USB Type-C Cable Assemblies used for DisplayPort ............................................................................. 36

4.1 Scenario 1 USB Type-C Full-Featured Cable Assembly ................................................................ 36

100

4.1.1 Scenario 1 USB Type-C Full-Featured cable Assembly using GEN2_BR ......................... 36

101

4.1.2 Scenario 1 USB Type-C Full-Featured cable Assembly using DP_BR .............................. 38

102

4.2 Scenarios 2a and 2b USB Type-C to Legacy DisplayPort Cable Assemblies ................................. 39

103

4.2.1 Scenario 2a USB Type-C DFP_D to Legacy DisplayPort UFP_D ..................................... 39

104

4.2.2 Scenario 2b Legacy DisplayPort DFP_D to USB Type-C UFP_D ..................................... 41

105

4.2.3 USB Type-C to Legacy DisplayPort Cable Assembly electrical properties ....................... 43

106

4.2.4 USB Type-C to Legacy DisplayPort Cable Assembly functionality .................................. 46

107

4.3 Scenarios 3a and 3c USB Type-C DFP_D to Protocol Converter ................................................... 48

108

4.3.1 HDMI Protocol Converter Adapters ................................................................................. 48

109

4.3.2 VGA Protocol Converter Adapters ................................................................................... 49

110

4.3.3 DVI Protocol Converter Adapters .................................................................................... 49

111

4.4 Scenario 4a USB Type-C DFP_D to a Multi-Function Dock (MF Dock) ....................................... 49

112

4.4.1 Scenario 4a USB Type-C Full-Featured Cable Assembly using GEN2_BR Multi-Function49

113

4.4.2 Scenario 4a USB Type-C Full-Featured Cable Assembly using DP_BR Multi-Function ... 50

114

4.5 Scenario 4b USB Type-C DFP_D to a VESA DockPort adapter .................................................... 52

115

4.6 Scenarios 4c/d USB Type-C DFP_D to Multi-Function cradle/captive cable dock ......................... 54

116

4.6.1 Scenarios 4c/d USB Type-C DFP_D to Multi-Function cradle dock using GEN2_BR

117

Multi-Function ............................................................................................................... 54

118

4.6.2 Scenario 4c/d USB Type-C DFP_D to Multi-Function cradle/captive cable dock using

119

DP_BR Multi-Function ................................................................................................... 56

120

5 Discovery and USB-PD .......................................................................................................................... 57

121

5.1 Connection discovery ................................................................................................................... 57

122

5.2 DisplayPort Mode discovery and entry/exit .................................................................................. 57

123

5.2.1 Structured VDM Header .................................................................................................. 57

124

5.2.2 DisplayPort Enter Mode .................................................................................................. 60

125

5.2.3 DisplayPort Status Update ............................................................................................... 60

126

5.2.4 DisplayPort Configure ..................................................................................................... 61

127

5.2.5 Attention ......................................................................................................................... 63

128

5.2.6 DisplayPort Exit Mode .................................................................................................... 63

129

5.3 VDM Message flows .................................................................................................................... 64

130

6 Miscellaneous ........................................................................................................................................ 75

131

6.1 VCONN and VBUS ........................................................................................................................ 75

132

6.2 Low power operation ................................................................................................................... 75

133

6.3 Equivalent USB Functionality ...................................................................................................... 75

134

A DisplayPort Alternate Mode Examples .................................................................................................. 76

135

A.1. Purpose ....................................................................................................................................... 76

136

A.1.1. DisplayPort Alternate Mode Examples ........................................................................... 76

137

A.2. USB Type-C USB Host to DisplayPort Video Adapter Example .................................................. 76

138

A.2.1. DisplayPort Video Adapter Assumptions ........................................................................ 76

139

A.2.2. Block Diagrams .............................................................................................................. 77

140

A.2.3. Solution ......................................................................................................................... 78

141

Proposed DisplayPort Alt Mode on USB Type-C

V1, d3

Page 5 of 83

DISTRIBUTION TO NON-MEMBERS IS PROHIBITED

Figures

147

Figure 2-1 USB Type-C Full-Feature Receptacle Interface (Front View) (Informative) ................................................... 15

148

Figure 2-2 USB Type-C Full-Feature Plug Interface (Front View) (Informative) ............................................................. 15

149

Figure 3-1 AUX and HPD Signaling using USB Type-C to USB Type-C cable assemblies ............................................ 33

150

Figure 3-2 AUX and HPD Signaling using USB Type-C to Legacy DisplayPort Adapters .............................................. 34

151

Figure 3-3 AUX and HPD Signaling using Legacy DisplayPort to USB Type-C Adapters .............................................. 35

152

Figure 4-1 Scenario 1 ......................................................................................................................................................... 36

153

Figure 4-2 Scenario 1 GEN2_BR Cable Assembly Wiring ............................................................................................... 37

154

Figure 4-3 Scenario 1 DP_BR Cable Assembly Wiring .................................................................................................... 38

155

Figure 4-4 Scenario 2a ....................................................................................................................................................... 39

156

Figure 4-6 Scenario 2b ....................................................................................................................................................... 41

157

Figure 4-8 ILfit at HBR, HBR2 and HBR3 ....................................................................................................................... 43

158

Figure 4-9 IMR versus ILfit at HBR3 ................................................................................................................................ 44

159

Figure 4-10 IRL versus ILfit at HBR3 ............................................................................................................................... 45

160

Figure 4-11 Scenario 3a ..................................................................................................................................................... 48

161

Figure 4-13 Scenario 4a ..................................................................................................................................................... 49

162

Figure 4-14 Scenario 4a GEN2_BR MF Cable Assembly Wiring ..................................................................................... 50

163

Figure 4-15 Scenario 4a DP_BR MF Cable Assembly Wiring .......................................................................................... 51

164

Figure 4-16 Scenario 4b ..................................................................................................................................................... 52

165

Figure 4-18 Scenario 4c ..................................................................................................................................................... 54

166

Figure 5-1 Connect Initial Actions ...................................................................................................................................... 64

167

Figure 5-2 DFP_U DisplayPort Alternate Mode Discovery and Entry ............................................................................... 65

168

Figure 5-3 DFP_U DisplayPort Configuration .................................................................................................................. 66

169

Figure 5-4 DFP_U DisplayPort Operation and Reconfiguration ....................................................................................... 67

170

Figure 5-5 DFP_U Reconfigure to USB Configuration ..................................................................................................... 68

171

Figure 5-6 DFP_U Exit Mode ............................................................................................................................................. 69

172

Figure 5-7 UFP_U DisplayPort Alternate Mode Discovery and Entry .............................................................................. 70

173

Figure 5-8 UFP_U USB Configuration Wait State ............................................................................................................ 71

174

Figure 5-9 UFP_U DisplayPort Configuration ................................................................................................................... 72

175

Figure 5-10 UFP_U DisplayPort Operation ....................................................................................................................... 73

176

Figure 5-11 UFP_U Exit Mode ........................................................................................................................................... 74

177

Figure 5-12 Hard Reset and Disconnection ....................................................................................................................... 74

178

Figure A-1 Host System Block Diagram ............................................................................................................................ 77

179

Figure A-2 DisplayPort Video Adapter Cable Assembly .................................................................................................. 78

180

Figure A-3 Example USB Dock with DisplayPort ............................................................................................................ 81

181

182

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雪夜不寒

2020-05-11

这个是Proposed DisplayPort Alt Mode on USB Type-C Standard， Version 1, Draft 3， 28 July, 2014。不是正式的，还非常老，有些地方写的并不清楚，并不是那么值得看。

DisplayPort-Alt-Mode-on-USB-C.pdf

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DisplayPort-Alt-Mode-on-USB-C.pdf

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