Owner manual

IMBA-XQ354 Motherboard
Page 196
C.1 Introduction
The DIO connector is interfaced to GPIO ports on the 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 Super I/O
chipset.
C.2 DIO Connector Pinouts
The Digital I/O port pins and their pin numbers are listed in the table below.
Pin Description Super I/O Pin No Super I/O Pin Description
1 Ground N/A N/A
2 VCC N/A N/A
3 Output 3 20 GP27
4 Output 2 21 GP26
5 Output 1 22 GP25
6 Output 0 23 GP24
7 Input 3 24 GP23
8 Input 2 25 GP22
9 Input 1 26 GP21
10 Input 0 27 GP20
Table C-1: Digital I/O Connector Pinouts
C.3 Assembly Language Samples
C.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.