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4 ETX® connectors
Kontron User's Guide ETX CD 22
4.3.2 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.
Warning: 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.