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IMB-Q870-i2 microATX Motherboard

Page 199

D.1 Introduction

The DIO connector on the IMB-Q870-i2 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.

D.2 DIO Connector Pinouts

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

Table 6-1: Digital I/O Connector Pinouts

D.3 Assembly Language Samples

D.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

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Iei-integration IMB-Q870-i2 Manuale Utente Pagina 215