82801FB Datasheet, PDF (108/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Functional Description
5.3.1.4
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 de-assertion of PCIRST#, the LAN controller PCI Configuration
Space, MAC configuration, and memory structure are initialized while preserving the PME# signal
and its context.
5.3.1.5
Wake-Up Events
There are two types of wake-up events: “Interesting” Packets and Link Status Change. These two
events are detailed below.
Note:
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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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet