Intel GD82559ER manual Power Management Control/Status Register Pmcsr

			Networking Silicon — GD82559ER
		Table 8. Power Management Capability Register
Bits	Default	Read/Write	Description
24:22	000b	Read Only	Auxiliary Current. This field reports whether the 82559ER
			implements the Data registers. The auxiliary power consumption is
			the same as the current consumption reported in the D3 state in the
			Data register.
21	1b	Read Only	Device Specific Initialization (DSI). The DSI bit indicates whether
			special initialization of this function is required (beyond the standard
			PCI configuration header) before the generic class device driver is
			able to use it. DSI is required for the 82559ER after D3-to-D0 reset.
20	0b (PCI)	Read Only	Reserved (PCI). When this bit is set to ‘1’, it indicates that the
			82559ER requires auxiliary power supplied by the system for wake-
			up from the D3cold state.
19	0b	Read Only	PME Clock. The 82559ER does not require a clock to generate a
			power management event.
18:16	010b	Read Only	Version. A value of indicates that the 82559ER complies with the PCI
			Power Management Specification, Revision 2.2.

7.1.19Power Management Control/Status Register (PMCSR)

The Power Management Control/Status is a word register. It is used to determine and change the current power state of the 82559ER and control the power management interrupts in a standard manner.

Table 9. Power Management Control and Status Register

Bits	Default	Read/Write	Description
15	0b	Read/Clear	PME Status. This bit is set upon a wake-up event. It is independent of
			the state of the PME Enable bit. If 1b is written to this bit, the bit will be
			cleared. It also de-asserts the PME# signal and clears the PME status
			bit in the Power Management Driver Register. When the PME# signal
			is enabled, the PME# signal reflects the state of the PME status bit.
14:13	00b	Read Only	Data Scale. This field indicates the data register scaling factor. It
			equals 10b for registers zero through eight and 00b for registers nine
			through fifteen.
12:9	0000b	Read Only	Data Select. This field is used to select which data is reported through
			the Data register and Data Scale field.
8	0b	Read Clear	PME Enable. This bit enables the 82559ER to assert PME#.
7:5	000b	Read Only	Reserved. These bits are reserved and should be set to 000b.
4	0b	Read Only	Dynamic Data. The 82559ER does not support the ability to monitor
			the power consumption dynamically.
3:2	00b	Read Only	Reserved. These bits are reserved and should be set to 00b.
1:0	00b	Read/Write	Power State. This 2-bit field is used to determine the current power
			state of the 82559ER and to set the 82559ER into a new power state.
			The definition of the field values is as follows.
			00 - D0
			01 - D1
			10 - D2
			11 - D3

Datasheet 55