This presentation discusses the major functions of input/output (I/O) modules. An I/O module connects peripheral devices like keyboards and printers to a computer system, interfacing both with the system bus and tailored data links. The main functions of an I/O module are to provide control and timing for data transfer, facilitate communication between the processor and connected devices, buffer input and output data, and detect errors. I/O devices are necessary for a computer system to allow interaction and data transfer with external hardware used by humans and other systems.

1. PUNDRA UNIVERSITY OF
SCIENCE & TECHNOLOGY
PRESENTATION ON:
MAJOR FUNCTION OF I/O MODULE
1
Name: Md.Delowar
Hossain Dolon
ID: 00817206031
Batch: 2nd
Semester: 6th
Department of CSE
Name: Sabrina Nasrin
Designation: Lecturer in
CSE
Department of CSE
Submitted By Submitted To

2. WHAT IS AN I/O MODULE?
 A device which is connected to an I/O module of
computer is called a peripheral device.
 The input/output module (I/O module) is
normally connected to the computer system on
one end and one or more input/output devices on
the other.
2

3. MAJOR FUNCTION OF I/O MODULE :
 This module has two major functions:
 Interface to the processor and memory via the system bus
or central switch .
 Interface to one or more peripheral devices by tailored data
links.
 The major functions or requirements for an i/o
module fall into the following catagories:
 ►Control and Timing
 ► Processor communication
 ► Device communication
 ► Data buffering
 ► Error detection
3

4. GENERIC MODEL OF I/O MODULE
 Fig: Generic Model of an I/O Module 4

5. WHY ARE I/O DEVICES NECESSARY
FOR A COMPUTER SYSTEM?
 I/O devices are the pieces of hardware used by a
human (or other system) to communicate with
a computer.
 The CPU and its supporting circuitry may
provide memory-mapped I/O that is used in low-
level computer programming, such as in the
implementation of device drivers, or may
provide access to I/O channels.
5

6. .
6

7. .
6