The USB miscellaneous control, status, and capabilities registers are
located in the USB_XHCI register set at base address 0xFE20_0000. They are summarized in the following table.
| Register Name | Offset Address | Access Type | Description |
|---|---|---|---|
| USBLEGSUP |
0x08E0
|
RW, R | Legacy support |
| USBLEGCTLSTS |
0x08E4
|
W1C, R | System management interrupts (SMI) |
| IMPL_USB2_DW0 |
|
R | Capabilities, revision |
| IMPL_USB2_DW1 |
|
R | Name string |
| IMPL_USB2_DW2 |
|
R | Hub, miscellaneous capabilities |
| IMPL_USB2_DW3 |
|
R | Protocol slot (0h) |