4.4 Connector X4
The following subsystems can be found on connector X4. The implementation of all the
subsystems comply with ETX
®
specification 2.7. The different subsystems require I/O
and IRQ resources. The necessary resources are allocated by the BIOS during the
POST routine and are configured to be compatible to common PC/AT settings. You can
use the BIOS setup to configure some of the parameters that relate to the specific
subsystems. Check the BIOS Setup Description section for more information about how
to configure a particular subsystem.
4.4.1 IDE
The IDE host adapter is capable of UDMA-100 operation. Only the Primary IDE channel
is supported.
4.4.2 Ethernet
Ethernet interface is provided by an Intel
®
82562 integrated Fast Ethernet NIC
controller. The controller is IEEE 802.3u, 10/100Base-Tx fast Ethernet compatible. The
interface provides single-ended differential signals that have to be routed through an
Ethernet transformer.
4.4.3 I
²
C Bus 400kHz
The I²C bus is implemented through the use of ATMEL ATmega88 microcontroller. It
provides a Fast Mode (400kHz max.) multi-master I²C Bus that has maximum I²C
bandwidth.
4.4.4 Power Control
PWGIN
PWGIN (pin 4 on the X4 connector) can be connected to an external power good circuit
or it may also be utilized as a manual reset input. In order to use PWGIN as a manual
reset the pin must be grounded through the use of a momentary-contact pushbutton
switch. When external circuitry asserts this signal, it's necessary that an open-drain
driver drives this signal causing it to be held low for a minimum of 15ms to initiate a
reset. Using this input is optional. Through the use of an internal monitor on the +5V
input voltage and/or the internal power supplies the conga-X945/XA945 module is
capable of generating its own power-on reset.
The conga-X945/XA945 provides support for controlling ATX-style power supplies. In
order to do this the power supply must provide a constant source of 5V power. When
not using an ATX power supply then the conga-X945/XA945's pins PS_ON, 5V_SB, and
PWRBTN# should be left unconnected.
PS_ON#
The PS_ON (pin 5 on the X4 connector) signal is an active-low output that turns on the
main outputs of an ATX-style power supply. This open-collector signal can be pulled up
Copyright © 2006 congatec AG
X945m13
28/102
