307013-003 Datasheet, PDF (112/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

Functional Description
5.3.1.6
Wake on LAN* (Preboot Wake-Up)
The LAN controller enters Wake on LAN mode after reset if the Wake on LAN bit in the
EEPROM is set. At this point, the LAN controller is in the D0u state. When the LAN
controller is in Wake on LAN mode:
• The LAN controller scans incoming packets for a Magic Packet and asserts the
PME# signal for 52 ms when a 1 is detected in Wake on LAN mode.
• The Activity LED changes its functionality to indicates that the received frame
passed Individual Address (IA) filtering or broadcast filtering.
• The PCI Configuration registers are accessible to the host.
The LAN controller switches from Wake on LAN mode to the D0a power state following
a setup of the Memory or I/O Base Address Registers in the PCI configuration space.
5.3.2 Serial EEPROM Interface
The serial EEPROM stores configuration data for the ICH7 integrated LAN controller and
is a serial in/serial out device. The LAN controller supports a 64-register or 256-register
size EEPROM and automatically detects the EEPROM’s size. The EEPROM should operate
at a frequency of at least 1 MHz.
All accesses, either read or write, are preceded by a command instruction to the
device. The address field is six bits for a 64-register EEPROM or eight bits for a 256-
register EEPROM. The end of the address field is indicated by a dummy 0 bit from the
EEPROM that indicates the entire address field has been transferred to the device. An
EEPROM read instruction waveform is shown in Figure 5-2.
Figure 5-2. 64-Word EEPROM Read Instruction Waveform
EE_SHCLKK
EE_CS
EE_DIN
EE_DOUT
A₅
A₄
A₃
A₂
AA₁₀ A₀
READ OP code
D₁₅
D₀
The LAN controller performs an automatic read of seven words (0h, 1h, 2h, Ah, Bh, Ch,
and Dh) of the EEPROM after the deassertion of Reset.
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Intel ^® ICH7 Family Datasheet