Intel ETX CD manual Connector X1 Signal Description, PCI Bus, Audio, Serial IRQ

4 ETX® connectors

4.3.2Connector 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.

Kontron User's Guide ETX CD 22