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Chapter 3 Hardware

30 Reference Manual CoreModule 745

User GPIO Interface

The CoreModule 745 provides GPIO pins for customer use, routing the signals from the ICH8-M chipset to

the J18 header. An example test application and source code reside in each BSP directory of the

CoreModule 745 Support Software QuickDrive.

For instructions on using the example applications, refer to the GPIO Readme in each BSP directory of the

QuickDrive. For more information about the GPIO pin operation, refer to the ICH8-M datasheet at:

http://www.intel.com/assets/pdf/datasheet/313056.pdf

Table 3-12 describes the pin signals of the GPIO interface, which consists of a 10-pin header with 2 rows,

odd/even pin sequence (1, 2), and 0.079" (2mm) pitch.

Note: The shaded table cells denote ground.

Utility Interface

The Utility interface provides three I/O signals on the module and consists of a 5-pin, 0.100" (2.54mm),

single-row header (J23). The ICH8-M drives the Power Button and Speaker signals on the Utility interface.

A separate Power Management microprocessor drives the Reset Switch signal. Table 3-13 provides the

signal definitions.

• Power Button

• Reset Switch

• Speaker

Power Button

The Utility header provides a signal for an external Power Button through pins 1 and 2. The Power Button

allows the user to shut down and power on the system. To shut down the system, press and hold the Power

Button for four seconds. Press the Power Button for one second to power on the system.

Reset Switch

Pins 2 and 3 on the Utility header provide the signal for an external reset button which allows the user to re-

boot the system.

Speaker

The speaker signal provides sufficient signal strength to drive a 1W 8  “Beep” speaker at an audible level

through pins 4 and 5 on the Utility header. The speaker signal is driven from an on-board amplifier and the

ICH8-M.

Table 3-12. User GPIO Interface Pin Signal Descriptions (J18)

Pin # Signal from ICH8-M Description

1 - GPI1 GPIO1 User defined

2 - GPO1 GPIO17 User defined

3 - GPI2 GPIO6 User defined

4 - GPO2 GPIO18 User defined

5 - GPI3 GPIO7 User defined

6 - GPO3 GPIO20 User defined

7 - GPI4 GPIO8 User defined

8 - GPO4 GPIO27 User defined

GND Ground

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 55 56

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