SLLSE76Q March 2011 – March 2024 TUSB7320 , TUSB7340
PRODUCTION DATA
This register is used to coordinate the ownership of the host controller between BIOS and the operating system.
xHCI Extended Capabilities Base register offset: 00h
Register type: Read-Only, Read/Write
Default value: 0000 0201h
Bit No. | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
Reset State | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit No. | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Reset State | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
BIT | FIELD NAME | ACCESS | DESCRIPTION |
---|---|---|---|
31:25 | RSVD | r | Reserved. Returns zeros when read. |
24 | HC_OS_SEMA | rw | HC OS Owned Semaphore. |
23:17 | RSVD | r | Reserved. Returns zeros when read. |
16 | HC_BIOS_SEMA | rw | HC BIOS Owned Semaphore. |
15:8 | NEXT_CAP | r | Next Capability Pointer. This field is 04h, indicating that the xHCI Supported Protocol Capability for USB 2.0 starts at offset 10h from the xHCI Extended Capabilities Base. |
7:0 | CAPABILITY_ID | r | Capability ID. This field is 01h, identifying this capability as a USB Legacy Support Capability. |