876784 Intel, 876784 Datasheet - Page 112
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876784
Manufacturer Part Number
876784
Description
Manufacturer
Intel
Datasheet
1.876784.pdf
(848 pages)
Specifications of 876784
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5.3.1.6
5.3.2
Figure 5-2.
112
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 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.
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
64-Word EEPROM Read Instruction Waveform
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.
• The LAN controller scans incoming packets for a Magic Packet and asserts the
• The Activity LED changes its functionality to indicates that the received frame
• The PCI Configuration registers are accessible to the host.
PME# signal for 52 ms when a 1 is detected in Wake on LAN mode.
passed Individual Address (IA) filtering or broadcast filtering.
EE_DOUT
EE_SHCLKK
EE_CS
EE_DIN
READ OP code
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ICH7 Family Datasheet
Functional Description
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