Kontron ETX-CD - Manual (Page 41)

ETX®-CD / ETX® Connectors
6.3.2 Connector X1 Signal Description
PCI Bus
The implementation of this subsystem complies with the ETX® Specification. Implementation information is provided in
the ETX® Design Guide. Refer to the documentation for additional information.
USB
Three USB host controllers (two 1.1 UHCI and one EHCI high-speed 2.0 controller) are on the Intel® 82801GB south
bridge device. The USB controllers comply with both versions 1.1 and 2.0 of the USB standard and are backward
compatible. The three controllers implement a root hub, which have two USB ports each.
Configuration
The USB controllers are PCI bus devices. The BIOS allocates required system resources during configuration of the PCI bus.
Audio
The ETX®-CD PCI audio controller is integrated in the Intel® 82801GB southbridge. The audio codec is compatible with
AC97.
Configuration
The audio controller is a PCI bus device. The BIOS allocates required system resources during configuration of the PCI
device.
Serial IRQ
The serial IRQ pin offers a standardized interface to link interrupt request lines to a single wire.
Configuration
The serial IRQ machine is in “Continuous Mode” per default and can be changed in the BIOS setup, the frame size is 21
frames and the start frame pulse width is 4 clocks.
3.3V Power Supply for External Components
The ETX®-CD offers the ability to connect external 3.3V devices to the onboard-generated supply voltage. Pin 12 and Pin
16 of Connector X1 are used to connect to the +3.3V ±5% power supply. The maximum external load is 500mA. Contact
Kontron Embedded Systems Technical Support for help with this feature.
Do not connect 3.3 V pins to external 3.3 V supply.
For additional information, refer to the ETX® Design Guide, I2C application notes, and JIDA specifications, all of which are
available on the Kontron Embedded Systems Web site.
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