Intel® 400 Series Chipset On-Package Platform Controller Hub
Online Register Database
ID | Date | Version | Classification |
---|---|---|---|
615146 | 08/09/2019 | 1.2 | Public |
Power Management Capabilities (PM_CAP) – Offset 72
Normally, this register is read-only to report capabilities to the power management software. In order to report different power management capabilities depending on the system in which the Intel PCH is used, the write access to this register is controlled by the Access Control bit (ACCTRL). The value written to this register does not affect the hardware other than changing the value returned during a read.This register is modified and maintained by BIOS
Bit Range | Default | Access | Field Name and Description |
---|---|---|---|
15:11 | 11000b | RW/L | PME_Support (PME_Support) This 5-bit field indicates the power states in which the function may assert PME#. The Intel PCH XHC does not support the D1 or D2 states. For all other states, the Intel PCH XHC is capable of generating PME#. Software should never need to modify this field. |
10 | 0b | RW/L | D2_Support (D2_Support) The D2 state is not supported. |
9 | 0b | RW/L | D1_Support (D1_Support) The D1 state is not supported. |
8:6 | 111b | RW/L | Aux_Current (Aux_Current) The Intel PCH XHC reports 375mA maximum Suspend well current required when in the D3cold state. This value can be written by BIOS when a more accurate value is known. |
5 | 0b | RW/L | DSI (DSI) The Intel PCH reports 0, indicating that no device-specific initialization is required. |
4 | - | - | Reserved
|
3 | 0b | RW/L | PME Clock (PMEClock) The Intel PCH reports 0, indicating that no PCI clock is required to generate PME#. |
2:0 | 010b | RW/L | Version (Version) The Intel PCH reports 010, indicating that it complies with Revision 1.1 of the PCI Power Management Specification. |