Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2
| ID | Date | Version | Classification |
|---|---|---|---|
| 834576 | 10/10/2024 | 001 | Public |
USB Legacy Support Capability (USBLEGSUP) – Offset 846c
This register is modified and maintained by BIOS
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31:25 | 0h | RO | Rsvd2 (RSVD2) Reserved |
| 24 | 0h | RW | HC OS Owned Semaphore (HCOSOS) Default = ‘0’. System software sets this bit to request ownership of the xHC. Ownership is obtained when this bit reads as ‘1’ and the HC BIOS Owned Semaphore bit reads as ‘0’. |
| 23:17 | 0h | RO | Rsvd1 (RSVD1) Reserved |
| 16 | 0h | RW | HC BIOS Owned Semaphore (HCBIOSOS) Default = ‘0’. The BIOS sets this bit to establish ownership of the xHC. System BIOS will set this bit to a ‘0’ in response to a request for ownership of the xHC by system software. |
| 15:8 | 22h | RW/L | Next Capability Pointer (NEXTCP) This field indicates the location of the next capability with respect to the effective address of this capability. |
| 7:0 | 1h | RW/L | Capability ID (CID) This field identifies the extended capability. Refer to Table 146 for the value that identifies the capability as Legacy Support. |