Download presentation

Presentation is loading. Please wait.

Published byGerard Hallmark Modified over 2 years ago

1
ECE 3110: Introduction to Digital Systems Chapter 6 Combinational Logic Design Practices XOR, Parity Circuits, Comparators

2
2 Exclusive OR and Exclusive NOR Gates XOR : XNOR : Truth Table : XOR X Y XOR XNOR 0 0 0 1 0 1 1 0 1 0 1 0 1 1 0 1 XOR X Y F X Y F

3
3 XOR and XNOR Symbols Equivalent Symbols of XOR gate Equivalent Symbols of XNOR gate Any 2 signals (inputs or outputs) may be complemented without changing the resulting logic function

4
4 SSI XOR and XNOR 74x86 : 4 XOR gates 74x266: 4 XNOR gates with “open collector” or “open drain” output

5
5 XOR Application: Parity Circuit Odd Parity Circuit : The output is 1 if odd number of inputs are 1 Even Parity Circuit : The output is 1 if even number of inputs are 1 Example : 4-bit Parity Circuit Daisy-Chain Structure Tree structure Input : 1101 Odd Parity output : 1 Even Parity output : 0 I0 I1 I2 I3 ODD EVEN I0 I1 I2 I3 ODD EVEN

6
6 MSI Parity Circuit : 74x280

7
7 Parity-Checking Application: memory

8
8 Comparators Compares Two binary words and indicate if they are equal Magnitude Comparators : A Comparator A=B? B A Comparator A=B B A>B A**
{
"@context": "http://schema.org",
"@type": "ImageObject",
"contentUrl": "http://images.slideplayer.com/12/3378286/slides/slide_8.jpg",
"name": "8 Comparators Compares Two binary words and indicate if they are equal Magnitude Comparators : A Comparator A=B.",
"description": "B A Comparator A=B B A>B A
**

9
9 Equality Comparators 1-bit comparator 4-bit comparator EQ_L

10
10 Iterative Comparator

11
11 Multi-bit Iterative Comparator

12
12 MSI Comparator : 74x85 4 bit comparator 3 outputs : A=B, A B 3 Cascading inputs Functional Output equations : (A>B OUT)= (A>B)+(A=B).(A>B IN) (A**B IN) =0 (A BIN A**

13
13 8 bit Comparator B0 A1 B1 A2 B2 A3 A0 B3 74x85 A**B Most Significant bitsLeast Significant bits
**

14
14 8-bit Magnitude Comparator

15
15 Other conditions

16
16 Next… Adders, subtractors, ALUs Reading Wakerly CH-6.10-6.11

Similar presentations

OK

Chapter 33 Basic Logic Gates. 2 Objectives –After completing this chapter, the student should be able to: Identify and explain the function of the basic.

Chapter 33 Basic Logic Gates. 2 Objectives –After completing this chapter, the student should be able to: Identify and explain the function of the basic.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on purchase order Ppt on natural and artificial satellites images Ppt on retail marketing in india Ppt on bing search engine Ppt on water cycle in hindi Ppt on sources of water pollution Ppt on omission of articles Ppt on non biodegradable waste materials Ppt online viewership Ppt on chapter human eye and the colourful world