Lecture 6: Gate Level Minimization Syed M. Mahmud, Ph.D ECE Department Wayne State University
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1 Lecture 6: Gate Level Minimization Syed M. Mahmud, Ph.D ECE Department Wayne State University Original Source: Aby K George, ECE Department, Wayne State University
2 Contents The Map method Two variable K-Map Three variable K-Map Four-variable K-Map Prime implicants Essential prime implicants Product-of-sums simplification Don t-care conditions Chapter 3 ECE 2610 Digital Logic 1 2
3 Introduction Logic synthesis: Minimization of logic function with available gates. Manual methods for the design of simple circuits. Gate-level minimization with manual methods (using theorems and postulates) is difficult when function is complex. Computer-based logic synthesis tools for minimization of complex functions. Chapter 3 ECE 2610 Digital Logic 1 3
4 The Map method or K-Map method Karnaugh Map or K-Map Pictorial form of a truth table. K-map Made up of squares Each square represents on minterm in the truth table The simplified expression Sum of product form (SOP) Product of sum (POS) Gives simplest algebraic expression. In some cases, more than one simplest expressions are possible. Chapter 3 ECE 2610 Digital Logic 1 4
5 Two-variable K-Map 2 variables => 2 2 = 4 min terms Ex: Simplify the following truth table x y F F = m 3 F = x. y Chapter 3 ECE 2610 Digital Logic 1 5
6 Two-variable K-Map Simplify the following truth table using K-Map x y F F = m 1 + m 2 + m 3 = x y + xy + xy F = x + y Chapter 3 ECE 2610 Digital Logic 1 6
7 Three-variable K-Map 3 variables => 2 3 = 8 minterms. Sequence arranged in Gray code Only one bit change in value between two adjacent squares Chapter 3 ECE 2610 Digital Logic 1 7
8 Three-variable K-Map Simplify the following truth table using K-Map x y z F F x x y yz m 0 m 1 m 3 m 2 m 4 m 5 m m z F = xz Chapter 3 ECE 2610 Digital Logic 1 8
9 Three-variable K-Map Simplify using K-Map F = Σ 2,3,4,5 F = Σ 3,4,6,7 F x yz y F x yz y m 0 m 1 m 3 m m 0 m 1 m 3 m x m 4 m m 7 m 6 x m 4 m 5 m 7 m z F = xy + x y z F = yz + xz Chapter 3 ECE 2610 Digital Logic 1 9
10 Three-variable K-Map Simplify using K-Map F = Σ 0,2,4,5,6 F = Σ 1,2,3,5,7 F x x y yz m 0 m 1 m 3 m m 4 m 5 m 7 m F x x y yz m 0 m 1 m 3 m m 4 m 5 m m 6 F = xy + z z z F = x y + z Chapter 3 ECE 2610 Digital Logic 1 10
11 K-Map Simplification Three variable K-Map Number of squares combined in K-Map Minimized literals One square Three literals Two adjacent squares combined Two literals Four adjacent squares combined One literal Eight adjacent squares combined Zero literals (Always answer is 1) Four variable K-Map Number of squares combined in K-Map Minimized literals One square Four literals Two adjacent squares combined Three literals Four adjacent squares combined Two literal Eight adjacent squares combined One literal Sixteen adjacent squares combined Zero literals (Always answer is 1) Chapter 3 ECE 2610 Digital Logic 1 11
12 Four-Variable K-Map No. of minterms = 2 4 = 16 Chapter 3 ECE 2610 Digital Logic 1 12
13 Four-variable K-Map Simplify the Boolean function F w, x, y, z = Σ(0,1,2,4,5,6,8,9,12,13,14) F y yz wx w m 0 m 1 m 3 m m 4 m m 7 m 12 m 13 m 15 m 8 m 9 m 6 m 14 x m 11 m 10 F = y + xz + w z z Chapter 3 ECE 2610 Digital Logic 1 13
14 Four-variable K-Map Simplify the Boolean function F A, B, C, D = A B C + B CD + A BCD + AB C F A AB CD C m 0 m 1 m 3 m 2 m 4 m 5 m 7 m 12 m 13 m 15 m 8 m 9 m 6 m 14 B m 11 m A B C = A B C D + D = A B C D + A B C D = m 1 + m 0 B CD = B CD A + A = AB CD + A B CD = m 10 + m 2 A BCD = m 6 AB C = AB C D + D = AB C D + AB C D = m 9 + m 8 D F = m 0 + m 1 + m 2 + m 6 + m 8 + m 9 + m 10 F = B D + B C + A CD Chapter 3 ECE 2610 Digital Logic 1 14
15 Prime Implicants While choosing adjacent squares: All minterms covered The number of terms in the expression is minimized There are no redundant terms A prime implicant is a product term obtained by combining the maximum possible number of adjacent squares in the Map. A prime implicant is essential if: It cannot be removed from a description of the function. It is the only prime implicant that covers the minterm. Chapter 3 ECE 2610 Digital Logic 1 15
16 Prime implicants F = Σ(0,2,3,5,7,8,9,10,11,13,15) F A AB C CD m 0 m 1 m 3 m m 4 m 5 m m 12 m 13 m m 8 m D m 6 m 14 B m 11 m 10 Only one way to include m 0 and m 5 Essential Prime implicants: BD, B D Prime implicants: CD, B C, AD, AB F = BD + B D + CD + AD = BD + B D + CD + AB = BD + B D + B C + AD = BD + B D + B C + AB Chapter 3 ECE 2610 Digital Logic 1 16
17 Product of sums simplification Take max terms for simplification Simplify F = Σ(0,1,2,5,8,9,10) into product of sum form F A AB C CD m 0 m 1 m 3 m m 4 m 5 m 7 m m 12 m 13 m m 8 m 9 m 14 B m 11 m F = AB + CD + BD Apply DeMorgan s theorem to get F F = (A + B )(C + D )(B + D) D Chapter 3 ECE 2610 Digital Logic 1 17
18 Product of sums simplification Simplify F = Π(0,2,5,7) into product of sum form F = Π 0,2,5,7 = Σ(1,3,4,6) F x x y yz m 0 m 1 m 3 m m 4 m 5 m 7 m F = x z + xz F = (x + z)(x + z ) z Chapter 3 ECE 2610 Digital Logic 1 18
19 Don t-care conditions Don t-care (X) minterm is a combination of variables whose logical value is not specific. Example: 4-bit binary code for decimal numbers 0000 to 1001 Valid 1010 to 1111 Invalid The don t-care condition can be used on a map to provide further simplification of Boolean expression. Chapter 3 ECE 2610 Digital Logic 1 19
20 Don t-care condition Simplify the Boolean function F(w, x, y, z) = Σ(1,3,7,11,15) which has a don t-care condition d(w, x, y, z) = Σ(0,2,5) F w wx y yz m 0 m 1 m 3 m 2 00 X 1 1 X m 4 m 5 m 7 01 X 1 m 12 m 13 m m 8 m m 6 m 14 x m 11 m 10 F = yz + w z z Chapter 3 ECE 2610 Digital Logic 1 20
21 Don t-care condition Simplify the Boolean function F(w, x, y, z) = Σ(1,3,7,11,15) which has a don t-care condition d(w, x, y, z) = Σ(0,2,5) using product of sum simplificiton F w wx yz y m 0 m 1 m 3 m 2 00 X 1 1 X m 4 m 5 m 7 m X 1 0 m 12 m 13 m m 8 m 9 m 14 x m 11 m F = z + wy F = z(w + y) z Chapter 3 ECE 2610 Digital Logic 1 21
22 Other minimization methods Algebraic methods Simplify using Algebraic theorems. Quine McClusky Method Tabular method Can work for any number of variables Scheinman Method Column-wise writing of minterms as decimal numbers and their simplification Can work for any number of variables Chapter 3 ECE 2610 Digital Logic 1 22
23 Summary Simplify a Karnaugh Map for Boolean functions of 2, 3, and 4 variables Find prime implicants of a Boolean function How to obtain the sum-of-product terms and product-of-sum forms of a Boolean function directly from K-Map How to use don t-care conditions to simplify a K-Map Chapter 3 ECE 2610 Digital Logic 1 23
24 Homework 3 Part a Simplify Boolean functions Chapter 3 ECE 2610 Digital Logic 1 24
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