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3.14.4
IDE Drive Activity LED
Table 28.
IDE Drive Activity LED
LED Status
Off
Green (Blinking)
3.14.5
User 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)
Off
Red
The user-programmable LEDs are connected to the GPIO pins on the ICH3 device as follows:
Table 30.
GPIO Pin Connections
User_Prog_LED1_Red#
User_Prog_LED1_GRN#
User_Prog_LED2_Red#
User_Prog_LED2_GRN#
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.
Technical Product Specification
Order #273817
®
Intel NetStructure
MPCBL0001 High Performance Single Board Computer
Normal/No disk access
Disk access (read/write activity)
LED Status (right)
Off
Red/Green
PIN
Meaning
No Status
Active Status of user defined function
GPIO Pin
Default Value
GPIO21
1
GPIO20
1
GPIO28
1
GPIO23
0
Contents
Meaning
LED Color
Off
Off
Off
Green
67
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