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3.2.5.11
Ethernet signals (Connector X4 - CN7)
The Ethernet interface is realised, on ETX-A61 module, using an Intel
#0.
®
Since ETX
specifications doesn't support Gigabit Ethernet interface, only signals related to 10/100Mbps interface are carried out on connector X4 (CN7)
Here following the signals involved in Gigabit Ethernet management
RXD-/RXD+: Ethernet receiving differential pair.
TXD-/TXD+: Ethernet Transmitting differential pair.
ACTLED#: Ethernet controller activity indicator, Active Low Output signal, electrical level +3.3V_A.
LILED#: Ethernet controller link indicator, Active Low Output signal, electrical level +3.3V_A.
SPEEDLED#: Ethernet controller 100Mbps link indicator, Active Low Output signal, electrical level +3.3V_A.
These signals can be connected, on the Carrier board, directly to an RJ-45 connector, in order to complete the Ethernet interface.
LED signals, if not necessary, can be left floating on the carrier board.
3.2.5.12
Power Control and Management signals (Connector X4 - CN7)
®
According to ETX
specifications, on the connector X4 (CN7) there is a set of signals that are used to manage the power rails and power states.
The signals involved are:
PWGIN: Power Good Input, active high +3.3V_S input. This signal is used by the carrier board to report to the module that the power supply is good.
PS_ON#: Power On Signal, active low +5V_A output with 100KΩ pull-up resistor. This signal is used to turn on an external ATX power supply unit. For proper
working, it is necessary that external +5V_A voltage is supplied to the module through pin 3 of ETX connector X4 (CN7).
PWRBTN#. Power Button Input, active low +3.3V_A input with 10KΩ pull-up resistor. When working in ATX mode, this signal can be connected to a momentary
push-button: a pulse to GND of this signal will switch power supply On or Off.
RSMRST#: Resume Reset, active low +3.3V_A input with 10KΩ pull-up resistor. This signal is needed internally for correct power sequencing of the board. It can
be externally driven to command a reset of the power management logic.
SMBALERT#: System Management Bus Alert, active low +3.3V_A input with 10KΩ pull-up resistor. Any device placed on the SM Bus can drive this signal low to
signal an event on the bus itself.
BATLOW#: Battery Low, active low +3.3V_A input with 10KΩ pull-up resistor. This signal is driven by external circuitry to report that the system battery is going out
of charge, or other power related events.
GPE1#: General Purpose Event #1, active low +3.3V_A input with 10KΩ pull-up resistor. According to ETX
ETX-A61
ETX-A61 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.2 - Author: S.B. - Reviewed by G.G. Copyright © 2017 SECO S.r.l.
®
I211 Gigabit Ethernet controller, which is interfaced to the SOC through PCI-express lane
®
specifications, this signal can be used as a LID#
41
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