Logic Design I (17.341) Fall Lecture Outline

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1 Logic Design I (17.341) Fall 2011 Lecture Outline Class # 06 October 24, 2011 Dohn Bowden 1

2 Today s Lecture Administrative Main Logic Topic Homework 2

3 Course Admin 3

4 Administrative Admin for tonight Syllabus Review 4

5 Syllabus Syllabus Moved the Lab Lecture to next week 5

6 Syllabus Review Week Date Topics Chapter Lab Report Due 1 09/12/11 Introduction to digital systems and number systems /19/11 Binary Codes and Boolean Algebra /26/11 Boolean Algebra (continued) /03/11 Examination 1 X 10/10/11 No Class - Holiday 5 10/17/11 Application of Boolean Algebra /24/11 Karnaugh Maps and Lab lecture /31/11 Multi-Level Gate Circuits. NAND and NOR Gates /07/11 Examination /14/11 Combinational Circuit Design and Simulation Using Gates 10 11/23/11 Multiplexers, Decoders. Encoder, and PLD /28/11 Introduction to VHDL /05/11 Examination /12/11 Review /19/11 Final Exam 6

7 Exam #1 Exam #1 Will be passed back 7

8 Exam #2 Will be in two weeks November 07,

9 Questions? 9

10 Chapter 5 KARNAUGH MAPS 10

11 Introduction Switching functions can generally be simplified by using Algebraic techniques Two problems arise when algebraic procedures are used The procedures are difficult to apply in a systematic way It is difficult to tell when you have arrived at a minimum solution The Karnaugh map aka K-Map method is Generally faster and easier to apply than other simplification methods 11

12 Minimum Forms of Switching Functions 12

13 Minimum Forms of Switching Functions Given a minterm expansion the minimum sum-of-products format can often be obtained by the following procedure 1. Combine terms by using XY + XY = X Do this repeatedly to eliminate as many literals as possible A given term may be used more than once because X + X = X 2. Eliminate redundant terms by using the consensus theorem or other theorems 13

14 Minimum Forms of Switching Functions Unfortunately the result of this procedure may depend on The order in which the terms are combined or Eliminated so that the final expression obtained is not necessarily minimum 14

15 Minimum Forms of Switching Functions Example Find a minimum sum-of-products expression for None of the terms in the above expression can be eliminated by consensus However 15

16 Minimum Forms of Switching Functions However Combining terms in a different way leads directly to a minimum sum of products So 16

17 Minimum Forms of Switching Functions So different solutions can result depending on the order of combining terms 17

18 Two and Three Variable K-Maps 18

19 Two Variable K-Maps Like a truth table the K-map of a function specifies The value of the function for every combination of values of the independent variables 19

20 Two Variable K-Maps The truth table for the function F 20

21 Two Variable K-Maps Truth table and corresponding K-map for the function F F for A = B = 0 is plotted in the upper left square, Each 1 on the map corresponds to a minterm of F 21

22 Two Variable K-Maps Read minterms from the map A 1 in square 00 indicates that A B is a minterm of F A 1 in square 01 indicates that A B is a minterm 22

23 Two Variable K-Maps Minterms in adjacent squares of the map can be combined since they differ in only one variable A B and A B combine to form A Indicate by looping the corresponding 1 s on the map 23

24 Three Variable K-Maps 24

25 Three Variable K-Maps Three variable truth table and the corresponding K-map Note row labels 00, 01, 11, and 10 differ by only one variable 25

26 Three Variable K-Maps Location of Minterms on a Three Variable K-Map 26

27 Three Variable K-Maps Minterms in adjacent squares of the map differ in only one variable therefore can be combined using the theorem XY + XY = X 27

28 Three Variable K-Maps K-Map of F (a, b, c) = Σ m(1, 3, 5) = M(0, 2, 4, 6, 7) 28

29 K-Maps for Product Terms 29

30 K-Maps for Product Terms 30

31 K-Maps for Product Terms f(a,b,c) = abc' + b'c + a' 31

32 Simplification of a Three-Variable Function 32

33 Simplification of a Three-Variable Function 33

34 Complement 34

35 Complement The map for the complement of F is formed by replacing 0 s with 1 s and 1 s with 0 s on the map of F therefore F = c + ab 35

36 Consensus Theorem 36

37 Consensus Theorem K-Maps Which Illustrate the Consensus Theorem 37

38 Function with Two Minimal Forms 38

39 Function with Two Minimal Forms 39

40 Four-Variable K-Map 40

41 Four Variable K-Map Each minterm is located adjacent to the four terms with which it can combine For example m 5 (0101) could combine with m 1 (0001) m 4 (0100) m 7 (0111) or m 13 (1101) 41

42 Four Variable K-Map Example Plot of acd + a b + d 42

43 Simplification of Four Variable Functions 43

44 Simplification of Four Variable Functions 44

45 Simplification of Four Variable Functions 45

46 Simplification of an Incompletely Specified Function 46

47 Simplification of an Incompletely Specified Function 47

48 Example 48

49 Example EXAMPLE Use a four variable K-map to find the minimum product of sums for f f = x z + wyz + w y z + x y 49

50 Example First plot the 1 s on a K-Map f = x z + wyz + w y z + x y 50

51 Example From the 0 s we get f ' = y'z + wxz' + w'xy 51

52 Example Complement f to get a minimum product of sums of f f ' = y'z + wxz' + w'xy f = (y + z )(w + x + z)(w + x + y ) 52

53 Determination of Minimum Expressions Using Essential Prime Implicants 53

54 Implicants and Prime Implicants Any single 1 or any group of 1 s which Can be combined together on a map of the function F Represents a product term which is called an implicant of F 54

55 Implicants and Prime Implicants A product term implicant is called A prime implicant if It cannot be combined with another term to eliminate a variable 55

56 Implicants and Prime Implicants Implicant Prime Implicant Prime Implicant Implicant Implicant Prime Implicant 56

57 Determination of All Prime Implicants 57

58 Determination of All Prime Implicants 58

59 Determination of All Prime Implicants 59

60 Determination of All Prime Implicants 60

61 Essential Prime Implicants 61

62 Essential Prime Implicants If a minterm is covered by only one prime implicant That prime implicant is said to be essential and It must be included in the minimum sum of products Essential Prime Implicants Prime Implicants Implicants 62

63 Essential Prime Implicants 1 s shaded in blue are covered by only one prime implicant (essential) All other 1 s are covered by at least two prime implicants 63

64 Flowchart for Determining a Minimum Sum of Products Using a K-Map 64

65 Flowchart for Determining a Minimum Sum of Products Using a Karnaugh Map 65

66 Flowchart Procedure Illustration Shaded 1 s are covered by only one prime implicant Essential prime implicants A B AB D Then AC D covers the remaining 1 s 66

67 Five Variable K-Maps 67

68 Five Variable K-Maps A five-variable map can be constructed in three dimensions by placing one four-variable map on top of a second one. Terms in the bottom layer are numbered 0 through 15 and corresponding terms in the top layer are numbered 16 through 31, so that the terms in the bottom layer contain A' and those in the top layer contain A. To represent the map in two dimensions, we will divide each square in a four-variable map by a diagonal line and place terms in the bottom layer below the line and terms in the top layer above the line. 68

69 Note that terms m 0 and m 20 do not combine because they are in different layers and different columns (they differ in two variables). A Five-Variable Karnaugh Map 69

70 Each term can be adjacent to exactly five other terms: four in the same layer and one in the other layer. 70

71 When checking for adjacencies, each term should be checked against the five possible adjacent squares. P 1 and P 2 are essential prime implicants. 71

72 P 1, P 2, P 3, and P 4 are essential prime implicants. F(A, B, C, D, E) = Ʃ m(0, 1, 3, 8, 9, 14, 15, 16, 17, 19, 25, 27, 31) 72

73 Using a Karnaugh map to facilitate factoring, we see that the two terms in the first column have A B in common; the two terms in the lower right corner have AC in common. 73

74 F = ABCD + B CDE + A B + BCE We can use a Karnaugh map for guidance in algebraic simplification. From Figure 5-26, we can add the term ACDE by the consensus theorem and then eliminate ABCD and B CDE. 74

75 75

76 Other Forms of Karnaugh Maps Instead of labeling the sides of a Karnaugh map with 0 s and 1 s, some people prefer to use Veitch diagrams. In Veitch diagrams, A = 1 for the half of the map labeled A, and A = 0 for the other half. The other variables have a similar interpretation. 76

77 Veitch Diagrams 77

78 Two alternative forms of five-variable maps are also used. One form simply consists of two four-variable maps side-by-side. A modification of this uses a mirror image map. In this map, first and eighth columns are adjacent as are second and seventh columns, third and sixth columns, and fourth and fifth columns. 78

79 Side-by-side Form of Five-Variable K-Maps 79

80 Mirror Image Form of Five-Variable K-Maps 80

81 Lab 81

82 Lab No topics this week 82

83 Next Week 83

84 Next Week Topics Chapter 7 Multi-Level Gate Circuits NAND and NOR Gates Lab introduction 84

85 Home Work 85

86 Homework 1. Read Chapters 7 2. Solve the following Chapter 5 problems Programmed Exercise 5.1 Programmed Exercise

87 References 1. None 87

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