11
GETTING TO KNOW YOUR MTC-2021
2.2.9 Audio Connector
The MTC-2021 offers stereo audio connector of Mic-in and Line-out. The
audio chip controller is by Realtek ALC892 which is compliant with the Intel
Azalia standard. To utilize the audio function in Windows, you need to install
corresponding drivers for Realtek ALC892 code.
2.2.10 8-bit GPIO
The MTC-2021 offers an 8-bit GPIO connector. Each bit internal pull up a weak
resistor to +V3.3_SB. Each bit can be configured for GPI or GPO. You can find
the setting in BIOS.
Pin No.
Definition
Mapping to SIO
GPIO Function
1
GPIO 0
SIO_GPI70
2
GPIO 1
SIO_GPI71
3
GPIO 2
SIO_GPI72
4
GPIO 3
SIO_GPI73
5
GND
GND
6
GPIO 4
SIO_GPI74
7
GPIO 5
SIO_GPI75
8
GPIO 6
SIO_GPI76
9
GPIO 7
SIO_GPI76
1
5
6
9
