Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2
ID | Date | Version | Classification |
---|---|---|---|
834576 | 10/10/2024 | 001 | Public |
HBA Capabilities Extended (GHC_CAP2) – Offset 24
This register indicates basic capabilities of the HBA to driver software. The RWO bits in this register are only cleared upon PLTRST#.
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:6 | 0h | RO | RSVD0 (RSVD0) Reserved |
5 | 1h | RW/O | DEVSLP Entrance from Slumber Only (DESO) This field specifies that the HBA shall only assert DEVSLP if the interface is in Slumber. When this bit is set to 1, the HBA shall ignore software directed entrance to DEVSLP via PxCMD.ICC unless PxSSTS.IPM = 6h. When this bit is cleared to 0, the HBA may enter DEVSLP from any link state (active, Partial, or Slumber). BIOS is required to program this field to 1. |
4 | 1h | RW/O/V | Supports Aggressive DEVSLP Management (SADM) When set to 1, the HBA supports hardware assertion of the DEVSLP signal after the idle timeout expires. When cleared to 0, this function is not supported and software shall treat the PxDEVSLP.ADSE field as reserved. |
3 | 1h | RW/O/V | Supports DEVSLP (SDS) When set to 1, the HBA supports the DEVSLP feature. When cleared to 0, DEVSLP is not supported. |
2 | 1h | RW/O/V | Automatic Partial to Slumber Transitions (APST) When set to 1, the HBA supports Automatic Partial to Slumber Transitions. When cleared to 0, Automatic Partial to Slumber Transition is not supported. |
1 | 0h | RO | RSVD1 (RSVD1) Reserved |
0 | 0h | RO | BIOS/OS Handoff (BOH) Not supported. |