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 |
|---|---|---|---|
0x08E0
|
RW, R | Legacy support | |
0x08E4
|
W1C, R | System management interrupts (SMI) | |
|
|
R | Capabilities, revision | |
|
|
R | Name string | |
|
|
R | Hub, miscellaneous capabilities | |
|
|
R | Protocol slot (0h) |