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Computer Peripherals 02 .pdf



Original filename: Computer Peripherals 02.pdf
Title: Chapter 4 Interfacing I/O Devices
Author: Bassel Soudan

This PDF 1.5 document has been generated by Microsoft® PowerPoint® 2010, and has been sent on pdf-archive.com on 05/11/2015 at 22:47, from IP address 41.176.x.x. The current document download page has been viewed 359 times.
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Communication Ports
LECTURE 02:PARALLEL PORTS

Communication Ports
INTRODUCTION

 There are two basic data transmission methods modern computes employ:

parallel data transmission and serial data transmission. In a serial data
transmission scheme one device sends data to another a single bit at a time
across one wire. In a parallel transmission scheme, one device sends data
to another several bits at a time (in parallel) on several different wires.

01010100100011111010101011001010101010101010
Serial transmission
Parallel port

0
1
1
0
1
1
0
1

Parallel transmission

2

Communication Ports

3

Communication Ports
PARALLEL PORTS

4

UNDERSTANDING THE PARALLEL PORT

Understanding the Parallel Port
Data Lines (D) used for output

13 12 11 10 9

8

7

6

5

4

3

2

1

25 24 23 22 21 20 19 18 17 16 15 14

Grounds
Status Lines (S) used for
input.

Control Lines (C) may be used
for input / output

Parallel Port - Output
Data Lines (D) used for output

13

25

12

24

11

23

10

22

D7

D6

D5

D4

D3

D2

D1

D0

9

8

7

6

5

4

3

2

21

20

19

18

17

16

15

14

Ground

1

Parallel Port - Output

D7

D6

D5

D4

D3

D2

D1

D0

128

64

32

16

8

4

2

1

27

26

25

24

23

22

21

20

Parallel Port
MODES OF OPERATIONS

 Compatibility Mode: "Centronics" or standard mode




It is commonly called the "Centronics" mode and is the method utilized with the
SPP (Standard Parallel Port).
This mode defines the protocol used by most PCs to transfer data to a printer.

 Nibble Mode:.


Transfers 4 bits at a time (a nibble) using Status Lines for data.

 Byte Mode: 8 bits at a time using data lines.


Added the capability to disable the drivers used for driving the data lines, and
allowed the data port to become an input read data port.

9


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