USB Power Delivery Specification Revision 3.1, Version 1.3 Page 15
6.1 Overview ................................................................................................................................................................................ 121
6.2 Messages ................................................................................................................................................................................ 121
6.2.1 Message Construction.................................................................................................................................................. 121
6.2.1.1 Message Header ......................................................................................................................................................................... 122
6.2.1.1.1 Extended ................................................................................................................................................................................. 122
6.2.1.1.2 Number of Data Objects ................................................................................................................................................... 123
6.2.1.1.3 MessageID .............................................................................................................................................................................. 123
6.2.1.1.4 Port Power Role ................................................................................................................................................................... 123
6.2.1.1.5 Specification Revision ....................................................................................................................................................... 124
6.2.1.1.6 Port Data Role ....................................................................................................................................................................... 125
6.2.1.1.7 Cable Plug ............................................................................................................................................................................... 125
6.2.1.1.8 Message Type ....................................................................................................................................................................... 126
6.2.1.2 Extended Message Header .................................................................................................................................................... 126
6.2.1.2.1 Chunked .................................................................................................................................................................................. 126
6.2.1.2.2 Chunk Number ..................................................................................................................................................................... 127
6.2.1.2.3 Request Chunk ..................................................................................................................................................................... 127
6.2.1.2.4 Data Size .................................................................................................................................................................................. 127
6.2.1.2.5 Extended Message Examples ......................................................................................................................................... 127
6.3 Control Message .................................................................................................................................................................. 132
6.3.1 GoodCRC Message ......................................................................................................................................................... 133
6.3.2 GotoMin Message........................................................................................................................................................... 133
6.3.3 Accept Message .............................................................................................................................................................. 134
6.3.4 Reject Message ............................................................................................................................................................... 134
6.3.5 Ping Message ................................................................................................................................................................... 135
6.3.6 PS_RDY Message ............................................................................................................................................................ 135
6.3.7 Get_Source_Cap Message ............................................................................................................................................ 135
6.3.8 Get_Sink_Cap Message ................................................................................................................................................. 135
6.3.9 DR_Swap Message ......................................................................................................................................................... 135
6.3.10 PR_Swap Message ......................................................................................................................................................... 136
6.3.11 VCONN_Swap Message ................................................................................................................................................ 136
6.3.12 Wait Message .................................................................................................................................................................. 137
6.3.12.1 Wait in response to a Request Message .......................................................................................................................... 137
6.3.12.2 Wait in response to a PR_Swap Message ........................................................................................................................ 138
6.3.12.3 Wait in response to a DR_Swap Message ....................................................................................................................... 138
6.3.12.4 Wait in response to a VCONN_Swap Message .............................................................................................................. 138
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