Intel GD82559ER, Datasheet

Page: 61 / 94

Datasheet 55
Networking Silicon — GD82559ER
7.1.19 Power 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.
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 D3
cold
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.
Table 8. Power Management Capability Register
Bits Default Read/Write Description
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