12th Generation Intel® Core™ Processors Datasheet Volume 2 of 2
ID | Date | Version | Classification |
---|---|---|---|
767625 | 07/13/2023 | Public |
PCI Power Management Control (PMCS) – Offset A4
PCI Power Management Control
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
31:24 | 0x0 | RO | Data (DTA) Reserved. |
23 | 0x0 | RO | Bus Power / Clock Control Enable (BPCE) Reserved per PCI Express specification |
22 | 0x0 | RO | B2/B3 Support (B23S) Reserved per PCI Express specification. |
21:16 | 0h | RO | Reserved |
15 | 0x0 | RO | PME Status (PMES) Indicates a PME was received on the downstream link. |
14:13 | 0x0 | RO | Data Scale (DSC) Reserved. |
12:9 | 0x0 | RO | Data Select (DSEL) Reserved. |
8 | 0x0 | RW/P | PME Enable (PMEE) Indicates PME is enabled. The root port takes no action on this bit, but it must be RW for legacy Windows operating systems to enable PME# on devices connected to this root port. |
7:4 | 0h | RO | Reserved |
3 | 0x1 | RW/O | No Soft Reset (NSR) When set to 1 this bit indicates that devices transitioning from D3hot to D0 because of Power State commands do not perform an internal reset. Configuration context is preserved. Upon transition from D3hot to D0 Initialized state, no additional operating system intervention is required to preserve Configuration Context beyond writing the Power State bits. |
2 | 0h | RO | Reserved |
1:0 | 0x0 | RW | Power State (PS) This field is used both to determine the current power state of the root port and to set a new power state. The values are: |