Datasheet 875
Intel® Management Engine Interface (MEI) Subsystem Registers (D22:F0)
23.1.19 PMCS—PCI Power Management Control and Status
Register (MEI—D22:F0)
Address Offset: 54h–55h Attribute: R/WC, R/W, RO
Default Value: 0008h Size: 16 bits
23.1.20 MID—Message Signaled Interrupt Identifiers Register
(MEI—D22:F0)
Address Offset: 8Ch-8Dh Attribute: RO
Default Value: 0005h Size: 16 bits
Bit Description
15
PME Status (PMES) — R/WC. Bit is set by Intel ME Firmware. Host software clears bit
by writing ‘1’ to bit.
This bit is reset when CL_RST1# asserted.
14:9 Reserved
8
PME Enable (PMEE) — R/W. This bit is read/write and is under the control of host SW.
It does not directly have an effect on PME events. However, this bit is shadowed so ME
FW can monitor it. ME FW will not cause the PMES bit to transition to 1 while the PMEE
bit is 0, indicating that host SW had disabled PME.
This bit is reset when PLTRST# asserted.
7:4 Reserved
3
No_Soft_Reset (NSR) — RO. This bit indicates that when the Intel MEI host controller
is transitioning from D3
hot
to D0 due to a power state command, it does not perform an
internal reset. Configuration context is preserved.
2 Reserved
1:0
Power State (PS) — R/W. This field is used both to determine the current power state
of the Intel MEI host controller and to set a new power state. The values are:
00 = D0 state (default)
11 = D3
hot
state
The D1 and D2 states are not supported for the Intel MEI host controller. When in the
D3
hot
state, the Intel ME’s configuration space is available, but the register memory
spaces are not. Additionally, interrupts are blocked.
Bit Description
15:8 Next Pointer (NEXT) — RO. Value of 00h indicates that this is the last item in the list.
7:0 Capability ID (CID) — RO. Capabilities ID indicates MSI.
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