82NM10 Datasheet, PDF (88/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Functional Description
5.3.1.4
5.3.1.5
Note:
providing the system wake-up capabilities. In the D3_COLD state, the LAN controller can
provide wake-up capabilities. Wake-up indications from the LAN controller are provided
by the Power Management Event (PME#) signal.
PCI Reset Signal
The PCIRST# signal may be activated in one of the following cases:
• During S3–S5 states
• Due to a CF9h reset
If PME is enabled (in the PCI power management registers), PCIRST# assertion does
not affect any PME related circuits (in other words, PCI power management registers
and the wake-up packet would not be affected). While PCIRST# is active, the LAN
controller ignores other PCI signals. The configuration of the LAN controller registers
associated with ACPI wake events is not affected by PCIRST#.
The integrated LAN controller uses the PCIRST# or the PWROK signal as an indication
to ignore the PCI interface. Following the deassertion of PCIRST#, the LAN controller
PCI Configuration Space, MAC configuration, and memory structure are initialized while
preserving the PME# signal and its context.
Wake-Up Events
There are two types of wake-up events: “Interesting” Packets and Link Status Change.
These two events are detailed below.
If the Wake on LAN bit in the EEPROM is not set, wake-up events are supported only if
the PME Enable bit in the Power Management Control/Status Register (PMCSR) is set.
However, if the Wake on LAN bit in the EEPROM is set, and Wake on Magic Packet* or
Wake on Link Status Change are enabled, the Power Management Enable bit is ignored
with respect to these events. In the latter case, PME# would be asserted by these
events.
“Interesting” Packet Event
In the power-down state, the LAN controller is capable of recognizing “interesting”
packets. The LAN controller supports predefined and programmable packets that can
be defined as any of the following:
• ARP Packets (with Multiple IP addresses)
• Direct Packets (with or without type qualification)
• Magic Packet
• Neighbor Discovery Multicast Address Packet (‘ARP’ in IPv6 environment)
• NetBIOS over TCP/IP (NBT) Query Packet (under IPv4)
• Internetwork Package Exchange* (IPX) Diagnostic Packet
This allows the LAN controller to handle various packet types. In general, the LAN
controller supports programmable filtering of any packet in the first 128 bytes.
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