4
3.3.6 Evaluate Context ........................................................................................................................... 73
3.3.7 Reset Endpoint .............................................................................................................................. 73
3.3.8 Stop Endpoint ................................................................................................................................ 74
3.3.9 Set TR Dequeue Pointer ............................................................................................................ 74
3.3.10 Reset Device ................................................................................................................................... 74
3.3.11 Force Event ..................................................................................................................................... 74
3.3.12 Negotiate Bandwidth .................................................................................................................. 74
3.3.13 Set Latency Tolerance Value .................................................................................................. 75
3.3.14 Get Port Bandwidth ..................................................................................................................... 75
3.3.15 Force Header .................................................................................................................................. 75
3.4 General Information .......................................................................................................................................... 75
3.5 Root Hub Management .................................................................................................................................... 76
3.6 xHCI Device Enumeration ............................................................................................................................... 76
4 Operational Model ............................................................................................................................................................... 77
4.1 Command Operation ........................................................................................................................................ 77
4.2 Host Controller Initialization ......................................................................................................................... 77
4.3 USB Device Initialization .................................................................................................................................. 79
4.3.1 Resetting a Root Hub Port ........................................................................................................ 84
4.3.2 Device Slot Assignment ............................................................................................................. 84
4.3.3 Device Slot Initialization ............................................................................................................ 85
4.3.4 Address Assignment ................................................................................................................... 86
4.3.5 Device Configuration .................................................................................................................. 86
4.3.6 Setting Alternate Interfaces ..................................................................................................... 87
4.3.7 Low-Speed/Full-Speed Device Support ............................................................................ 90
4.3.8 Bandwidth Management ........................................................................................................... 90
4.4 Device Detach ....................................................................................................................................................... 90
4.5 Device Slot Management ................................................................................................................................ 91
4.5.1 Device Context Index .................................................................................................................. 92
4.5.2 Slot Context Initialization ......................................................................................................... 93
4.5.3 Slot States ........................................................................................................................................ 94
4.5.4 USB Standard Device Request to xHCI Command Mapping .................................... 99
4.6 Command Interface ........................................................................................................................................ 100
4.6.1 Command Ring Operation .................................................................................................... 100
4.6.2 No Op .............................................................................................................................................. 103
4.6.3 Enable Slot ................................................................................................................................... 104
4.6.4 Disable Slot .................................................................................................................................. 105
4.6.5 Address Device ........................................................................................................................... 107
4.6.6 Configure Endpoint .................................................................................................................. 111
4.6.7 Evaluate Context ........................................................................................................................ 123
4.6.8 Reset Endpoint ........................................................................................................................... 125
4.6.9 Stop Endpoint ............................................................................................................................. 129
4.6.10 Set TR Dequeue Pointer ......................................................................................................... 137
4.6.11 Reset Device ................................................................................................................................ 140
4.6.12 Force Event (Optional Normative) ..................................................................................... 142
4.6.13 Negotiate Bandwidth (Optional Normative) ................................................................. 144
4.6.14 Set Latency Tolerance Value (LTV) (Optional Normative) ...................................... 146
4.6.15 Get Port Bandwidth .................................................................................................................. 147
4.6.16 Force Header ............................................................................................................................... 150
4.7 Doorbells ............................................................................................................................................................. 151
4.8 Endpoint .............................................................................................................................................................. 153
