MXGC Series
CyberResearch
®
Motherboards
CyberResearch, Inc
.
211
25 Business Park Drive
P: (203) 483-8815; F: (203) 483-9024
Branford, CT USA
www.cyberresearch.com
B.1 DIO Interface Introduction
The DIO connector on the MXGC Series is interfaced to GIO ports on the iTE Super I/O
chipset. The DIO has both 4-bit digital inputs and 4-bit digital outputs. The digital inputs
and digital outputs are generally control signals that control the on/off circuit of external
devices or TTL devices. Data can be read or written to the selected address to enable the
DIO functions.
NOTE:
For further information, please refer to the datasheet for the iTE Super
I/O chipset.
B.2 DIO Connector Pinouts
The following table describes how the DIO connector pins are connected to the Super I/O
GPIO port 1.
PIN NO. DESCRIPTION
PIN NO. DESCRIPTION
1 GND
2 VCC
3 Output
3 4 Output
2
5 Output
1 6 Output
0
7 Input
3 8 Input
2
9 Input
1 10
Input
0
B.3 Assembly Language Samples
B.3.1 Enable the DIO Input Function
The BIOS interrupt call INT 15H controls the digital I/O. An assembly program to enable
digital I/O input functions is listed below.
MOV AX,
6F08H
Sets the digital port as input
INT 15H
Initiates the INT 15H BIOS call
Summary of Contents for MXGC Series
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