Intel MPCBL0001 manual IDE Drive Activity LED, User Programmable LEDs, Gpio Pin Connections

Hardware Management Overview

3.14.4IDE Drive Activity LED

Table 28. IDE Drive Activity LED

LED Status	Meaning
Off	Normal/No disk access
Green (Blinking)	Disk access (read/write activity)

3.14.5User Programmable LEDs

The MPCBL0001 SBC provides two bicolor LEDs for user-programmable functions. The LEDs can be driven to display a red, green or amber color. When these LEDs are lit, they indicate a status of a user-defined function.

Table 29.	User Programmable LEDs
	LED Status (left)	LED Status (right)			Meaning
	Off	Off		No Status
	Red	Red/Green		Active Status of user defined function
	The user-programmable LEDs are connected to the GPIO pins on the ICH3 device as follows:
Table 30.	GPIO Pin Connections
	LED		Pin
	User_Prog_LED1_Red#		GPIO21
	User_Prog_LED1_GRN#		GPIO20
	User_Prog_LED2_Red#		GPIO28
	User_Prog_LED2_GRN#		GPIO23

By programming the ICH3 GPIO registers as outputs, then selecting the appropriate state (low for illumination, high for off), the user enables the LEDs as required. Refer to the ICH3 datasheet in appendix B for specific GPIO 20, 21, 23, 28 register information.

Intel NetStructure® MPCBL0001 High Performance Single Board Computer 65

Technical Product Specification