82541ER_13 Datasheet, PDF (17/51 Pages) Intel Corporation – 82541ER Gigabit Ethernet Controller

82541ER Gigabit Ethernet Controller
3.4
3.4.1
3.4.2
Miscellaneous Signals
LED Signals (4)
Symbol
LINK_LED#
ACTIVITY#
LINK100#
LINK1000#
Type
Name and Function
O
LED0 / LINK Up. Programmable LED indication. Defaults to indicate link
connectivity.
O
LED1 / Activity. Programmable LED indication. Defaults to flash to indicate
transmit or receive activity.
O
LED2 / LINK 100. Programmable LED indication. Defaults to indicate link at
100 Mbps.
O
LED3 / LINK 1000. Programmable LED indication. Defaults to indicate link at
1000 Mbps.
Other Signals (4)
Symbol
SDP[3:0]
Type
Name and Function
Software Defined Pin. The Software Defined Pins are reserved and programmable
TS
with respect to input and output capability. These default to input signals upon power-
up but may be configured differently by the EEPROM. The upper four bits may be
mapped to the General Purpose Interrupt bits if they are configured as input signals.
3.5
3.5.1
PHY Signals
Crystal Signals (2)
Symbol
XTAL1
XTAL2
Type
Name and Function
I
Crystal One. The Crystal One pin is a 25 MHz +/- 50 ppm input signal. It should be
connected to a crystal, and the other end of the crystal should connect to XTAL2.
O
Crystal Two. Crystal Two is the output of an internal oscillator circuit used to drive a
crystal into oscillation.
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