Intel GD82559ER manual 4.4 D3 Power State, Understanding Power Requirements, Pci Clk

GD82559ER — Networkin g Silicon

4.2.4.4D3 Power State

In the D3 power state, the 82559ER has the same capabilities and consumes the same amount of power as it does in the D2 state. However, it enables the PCI system to be in the B3 state. If the PCI system is in the B3 state (in other words, no PCI power is present), the 82559ER provides wake-up capabilities if it is connected to an auxiliary power source in the system. If PME is disabled, the 82559ER does not provide wake-up capability or maintain link integrity. In this mode the 82559ER consumes its minimal power.

The 82559ER enables a system to be in a sub-5 watt state (low power state) and still be virtually connected. More specifically, the 82559ER supports full wake-up capabilities while it is in the

D3cold state. The 82559ER can be connected to an auxiliary power source (VAUX), which enables it to provide wake-up functionality while the PCI power is off. The typical current consumption of the 82559ER is 125 mA at 3.3 V. Thus, a dual power plane is not required. If connected to an auxiliary power source, the 82559ER receives all of its power from the auxiliary source in all power states.

4.2.4.5Understanding Power Requirements

When running the 82559ER off a 3.3V_standby power source, the actual power consumption will scale with network traffic. In other words, if the 82559ER is monitoring the network for ACPI “Interesting Packets” only the PCI bus specific circuitry will be disabled. As an a example the 8259ER will typically draw approximately 120mA, in D1-D3 under a full Ethernet load. In the D0 state, the 82559ER will typically consume 125mA under the same load conditions.

The tables below summarizes the 82559ER’s functionality and power consumption at the different power states

Power State	Conditions	100 Mbs	10 Mbs
D0	Maximum	175 mA	140 mA
D0	Average (5 Mbs)	125 mA	115 mA
D0	Dynamic standby	120 mA	55 mA
	(With Network Load)
D2/D3 (link	PCI CLK	10 mA	10 mA
down)	w/o PCI CLK	3 mA	3 mA
Dx (x>0 with	PCI CLK	10 mA	10 mA
PME# disabled)	w/o PCI CLK	3 mA	3 mA

NOTE: All values shown for the D3 state assume the availability of 3.3 V Standby available to the device.

1.For a topology of two 82559ER devices connected by a crossed twisted-pair Ethernet cable, the deep power-down mode should be disabled. If it is enabled, the two devices may not detect each other if the operating system places them into a low power state before both nodes become active.

24 Datasheet