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CEGB Series
B.1 DIO Interface Introduction
The DIO connector on the CEGB 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.
172
MOV
AX, 6F08H
Sets the digital port as input
INT
15H
Initiates the INT 15H BIOS call
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