GD82541PI Datasheet, PDF (15/46 Pages) Intel Corporation – 82541 Family of Gigabit Ethernet Controllers

Networking Silicon — 82541(PI/GI/EI)
3.3
3.4
3.4.1
EEPROM and Serial FLASH Interface Signals (9)
Symbol
Type
Name and Function
EEMODE
I
EEDI
O
EEDO
I
EECS
O
EESK
O
FLSH_CE#
O
FLSH_SCK
O
FLSH_SI
O
FLSH_SO/
LAN_DISABLE#
I
EEPROM Mode. The EEPROM Mode pin is used to select the interface and
source of the EEPROM used to initialize the device. For a MIcrowire* EEPROM on
the standard EEPROM pins, tie this pin to ground with a 1 KΩ pull-down resistor
(for the 82541PI, use a 100 Ω pull-down resistor instead). For an Serial Peripheral
Interface (SPI*) EEPROM attached to the Flash memory pins, leave this pin
unconnected.
EEPROM Data Input. The EEPROM Data Input pin is used for output to the
memory device.
EEPROM Data Output. The EEPROM Data Output pin is used for input from the
memory device. EEDO includes an internal pull-up resistor.
EEPROM Chip Select. The EEPROM Chip Select signal is used to enable the
device.
EEPROM Serial Clock. The EEPROM Shift Clock provides the clock rate for the
EEPROM interface, which is approximately 1 MHz for Microwire* and 2 MHz for
SPI.
FLASH Chip Enable Output. Used to enable FLASH device.
FLASH Serial Clock Output. The clock rate of the serial FLASH interface is
approximately 1 MHz.
FLASH Serial Data Input. This pin is an output to the memory device.
FLASH Serial Data Output / LAN Disable. This pin is an input from the FLASH
memory. Alternatively, the pin can be used to disable the LAN port from a system
GP (General Purpose) port. If the 82541(PI/GI/EI) is not using Flash functionality,
the pin should be connected to external pull-up resistor.
If this pin is used as LAN_DISABLE#, the device goes to low power state and the
LAN port is disabled when the pin is sampled low on rising edge of PCI reset.
Miscellaneous Signals
LED Signals (4)
Symbol
Type
Name and Function
LED0 / LINK_UP# O
LED0 / LINK Up. Programmable LED indication. Defaults to indicate link
connectivity.
LED1 / ACTIVITY# O
LED1 / Activity. Programmable LED indication. Defaults to flash to indicate
transmit or receive activity.
LED2 / LINK100# O
LED2 / LINK 100. Programmable LED indication. Defaults to indicate link at
100 Mbps.
LED3 / LINK1000# O
LED3 / LINK 1000. Programmable LED indication. Defaults to indicate link at
1000 Mbps.
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