Boolean Algebra & Digital Logic


 Austin Barton
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1 Boolean Algebra & Digital Logic Boolean algebra was developed by the Englishman George Boole, who published the basic principles in the 1854 treatise An Investigation of the Laws of Thought on Which to Found the Mathematical Theories of Logic and Probabilities. The applicability to computing machines was discovered by three Americans Claude Shannon Symbolic Analysis of Relay and Switching Circuits, George Stibitz John Atanasoff An employee of Bell Labs, he developed a binary adder using mechanical relays in 1937, the model K 1 adder because he built it at home on his kitchen table. He was probably the first to use purely electronic relays (vacuum tubes) to build a binary adder. Boolean algebra is a two valued algebra based on the constant values denoted as either FALSE, TRUE 0, 1 The use of this algebra for computation is based on the fact that binary arithmetic is based on two values, always called 0 and 1.
2 Basic Boolean Operators Boolean algebra is defined in terms of two constants (defined above), which we call 0 and 1. Other courses will call these values F and T. Boolean algebra is defined in terms of three basic operators, to which we shall add a useful fourth operator. The three operators are NOT, AND, & OR. Each of these three basic operators is implemented by a basic electronic device called a logic gate. We present the gates along with the definition. NOT This function takes one input and produces one output. The gate is shown below. The circle at the right end of the triangle is important. Algebraically, this function is denoted f(x) = X or f(x) = X The evaluation of the function is simple: 0= 1 and 1 = 0.
3 Basic Boolean Operators (Part 2) Logic OR This is a function of two Boolean variables. We denote the logical OR of two Boolean variables X and Y by X + Y. Some logic books will use X Y. The evaluation of the logical OR function is shown by a truth table X Y X + Y
4 Basic Boolean Operators (Part 3) Logic AND This is a function of two Boolean variables. We denote the logical AND of two Boolean variables X and Y by X Y. Some logic books will use X Y. The evaluation of the logical AND function is shown by a truth table X Y X Y
5 Another Boolean Operator While not a basic Boolean operator, the exclusive OR is very handy. Logic XOR This is a function of two Boolean variables. We denote the logical XOR of two Boolean variables X and Y by X Y. Most logic books seem to ignore this function. The evaluation of the logical XOR function is shown by a truth table X Y X Y From this last table, we see immediately that X 0 = X and X 1 = X
6 Time Varying Inputs and Outputs Consider the figure below, adapted from the text by Rob Williams. What does it tell us? This is a two input AND gate, with inputs D (Data) and X (Control). If X = 0, the output will be 0 independently of the value of the data input. The simple answer is that the gate output follows the input when X = 1. The input is a time sequence of values. At any time, the data input to the AND gate is either d = 0 or d = 1. At that time, the output from the gate is either Y = 0 or Y = 1. The use of the letter O as in O = 1 is a bit hard to read; it appears confused.
7 More on the Time Sequence
8 Truth Tables The fact that any Boolean variable can assume only one of two possibly values can be shown, by induction, to imply the following. For N > 0, N Boolean variables can take only 2 N different combinations of values. For small values of N, we can use this to specify a function using a truth table with 2 N rows, plus a header row to label the variables and the function. N Four variable truth tables have 17 rows total. This is just manageable. Five variable truth tables have 33 rows total. This is excessive. N variable truth tables, for N > 5, are almost useless. 2 N
9 Sample Truth Table A B C F1(A, B, C) This truth table for 3 variables has 2 3 = 8 rows, plus a label row. This truth table forms a complete definition of the function. We shall later give it another name, but can base all our discussions on this table.
10 Another Sample Truth Table A B C F2(A, B, C)
11 Two Truth Tables in One A B C F1(A, B, C) F2(A, B, C) Truth tables are often used to show pairs of functions, such as these two, which will later be shown to be related. This is easier than two complete tables. Truth tables rarely show more than two functions, just because large truth tables are messy and hard to read.
12 Labeling Rows in a Truth Table The row numbers are just labels. They are not really a part of the truth table, but aid in our discussions and conversions to Boolean expressions. The row numbers are the decimal equivalents of the variable values viewed as binary Row Number X Y Z F(X, Y, Z) numbers. The first row is always row 0. 0 = = = = = = = =
13 The relative precedence of the operators is: 1) NOT do this first 2) AND 3) OR do this last Evaluation of Boolean Expressions As in the usual algebra, parentheses take precedence. A B + C D, often written as AB + CD, is read as (A B) + (C D) A B C D is read as A B C D A B + C D = = = 1 A (B + C) D = 1 (0 + 1) 1 = = 1 A B C D = A B = 1 0 = 0 = 1 A B = 1 0 = 0 1 = 0. The latter is really messy. = = = 0
14 The Basic Unusual Boolean Theorem Here are two sets of theorems in Boolean algebra. For all X 0 X = 0 OK For all X 1 X = X OK For all X 0 + X = X OK For all X 1 + X = 1 What? Consider the following truth tables W X W + X From this, we derive the truth table proving the last two theorems. X 0 + X 1 + X
15 Standard Boolean Forms In this section, we develop the idea of standard forms of Boolean expressions. In part, these forms are based on some standard Boolean simplification rules. Standard forms are either canonical forms or normal forms. The standard expressions are in either SOP POS Sum of Products form, or Product of Sums form. This lecture will focus on the following: Canonical Sum of Products Normal Sum of Products Canonical Product of Sums Normal Product of Sums We shall also discuss a few more variants that have no standard names. IMPORTANT: These forms use only the 3 basic Boolean functions: AND, OR, NOT. Specifically, XOR is not used.
16 Variables and Literals We start with the idea of a Boolean variable. It is a simple variable that can take one of only two values: 0 (False) or 1 (True). Following standard digital design practice, we use the values 0 and 1. Following standard teaching practice, we denote all Boolean variables by single letters; normally A, B, C, D, or W, X, Y, Z. A literal is either a Boolean variable or its complement. Literals based on the variable X: X and X. Literals based on the variable Y: Y and Y. NOTE: X and X represent the same variable, but they are not the same literal. X and Y represent different variables.
17 Product and Sum Terms A product term is the logical AND of one or more literals, with no variable represented more than once. A sum term is the logical OR of one or more literals, with no variable represented more than once. The following are all valid product terms over the two variables X and Y. X Y X Y X Y X Y Forms, such as X X Y and X X Y are not considered, as X X = X and X X = 0, so X X Y = X Y and X X Y = 0 Y = 0. The following are all valid sum terms over the two variables X and Y. X + Y X + Y X + Y X + Y Single literals According to the strict definition, a single literal is either a sum term or a product term, depending on the context. This is necessary to avoid having to give a number of special cases in the following definitions.
18 Sum of Products and Product of Sums A SOP (Sum of Products) expression is the logical OR of product terms. A POS (Product of Sums) expression is the logical AND of sum terms. Sample SOP expressions F1(X, Y) = X Y + X Y G1(X, Y) = X Y + X Y H1(X, Y, Z) = X + Y Z Note: If we did not allow single literals to be product terms, we would have trouble classifying H(X, Y, Z), which is clearly SOP. Sample POS expressions F2(X, Y) = (X+Y) ( X +Y ) G2(X, Y) = ( X +Y) (X+Y ) H2(X, Y, Z) = X (Y + Z) Note: POS expressions almost always have parentheses to indicate the correct evaluation.
19 More on Ambiguous Forms What is the form of the expression F(X, Y) = X + Y 1. SOP It is the logical OR of two product terms. Each product term is a single literal. 2. POS It is a single sum term (X + Y) Both statements are true. In general, questions such as this do not concern us. If you are asked a question like this on a test, either answer will be accepted. This ambiguity comes from the definitional necessity of mentioning the logical AND of one or more terms and the logical OR of one or more terms. With two equally good answers to an ambiguous form, pick the one you like.
20 Inclusion A product term T 1 is included in a product term T 2 if every literal in T 1 is also in T 2. A sum term T 1 is included in a sum term T 2 if every literal in T 1 is also in T 2. Consider the following examples: F(A, B, C) = A B + A C + A B C Each of A B and A C is included in A B C. G(A, B, C) = (A + B) (A + C) (A + B + C) Each of (A + B) and (A + C) is included in (A + B + C). There is no inclusion in the next expression F(A, B, C) = A B + A C + A B C The literal A does no appear in the third term. The inclusion rule is based on literals, not just variables.
21 Consider and More on Inclusion F1(A, B, C) = A B + A C + A B C F2(A, B, C) = A B + A C We claim that the two are equal for every value of A, B, and C. Let A = 0 Clearly F1(A, B, C) = 0 F2(A, B, C) = 0 Let A = 1 Then and F1(A, B, C) = B + C + B C F2(A, B, C) = B + C Notice that we still have inclusion in F1, as each of B and C is included in B C. We prove these versions of F1(A, B, C) = F2(A, B, C) using a truth table. B C B C B + C B + C + B C
22 Last Word on Inclusion If a SOP or POS expression has included terms, it can be simplified. F1(A, B, C) = A B + A C + A B C is identically equal to F2(A, B, C) = A B + A C G1(A, B, C) = (A + B) (A + C) (A + B + C) is identically equal to G2(A, B, C) = (A + B) (A + C) The conclusion is that Boolean expressions with included terms are needlessly complicated. We can simplify them by the application of trivial rules. Note that duplication is a form of inclusion. The expression F3(A, B) = A B + A B has 2 terms, each included in the other.
23 Non Standard Expressions Not every useful Boolean expression is in a standard form. F(X, Y) = X Y is not a standard form, due to the exclusive OR. G(X, Y) = X Y + (X + Y) ( X +Y) is not in a standard form. This has both a product term and a sum term. The fact that G(X, Y) can easily be converted to a standard form does not make it already in a standard form. Let s convert this to SOP. I usually have difficulty in conversion to POS, unless I am using a method I have yet to describe. The term X Y is already a product term, so we convert (X + Y) ( X +Y) to SOP. (X + Y) ( X +Y) = X ( X +Y) + Y ( X +Y) = X X + X Y + Y X + Y Y = 0 + X Y+ X Y + Y = (X + X ) Y + Y = 1 Y + Y = Y So G(X, Y) = X Y + Y = Y G(X, Y) = Y.
24 More on Non Standard Forms Look at the Boolean function G(X, Y) = X Y + Y. There are two ways to at look at this. Try both ways. Let G(X, Y) = X Y + Y = X Y + 1 Y = (X + 1) Y = 1 Y = Y Do a truth table proof of the equality. X Y X Y X Y + Y Note that the column marked X Y matches the one marked X Y + Y. The two functions are identical. Also note that the term Y is included in the term X Y, so that, by inclusión, the term X Y can be eliminated from the expression.
25 Normal and Canonical Forms A Normal SOP expression is a Sum of Products expression with no included product terms. A Normal POS expression is a Product of Sums expression with no included sum terms. A Canonical SOP expression over a set of Boolean variables is a Normal SOP expression in which each product term contains a literal for each of the Boolean variables. A Canonical POS expression over a set of Boolean variables is a Normal POS expression in which each sum term contains a literal for each of the Boolean variables. Note: Note: A canonical expression on N Boolean variables is made up of terms, each of which has exactly N literals. One can do digital design based on either normal or canonical forms. The choice usually depends on the technology used.
26 Equivalence of Canonical Forms and Truth Tables We can directly translate between either of the canonical forms and a truth table using a standard set of rules. To produce the Sum of Products representation from a truth table, a) Generate a product term for each row where the value of the function is 1. b) The variable is complemented if its value in the row is 0, otherwise it is not. To produce the Product of Sums representation from a truth table, a) Generate a sum term for each row where the value of the function is 0. b) The variable is complemented if its value in the row is 1, otherwise it is not. SOP: Row X Y X Y Terms for rows 1 and 2. Row 1: X Y, Row 2: X Y F = X Y + X Y POS: Terms for rows 0 and 3. Row 0: (X + Y), Row 3: ( X + Y ) F = (X + Y) ( X + Y )
27 SOP Example: Truth Table to Canonical Form To produce the Sum of Products representation from a truth table, a) Generate a product term for each row where the value of the function is 1. b) The variable is complemented if its value in the row is 0, otherwise it is not. Here again is the truth table. Row A B C F The term is A B C The term is A B C The term is A B C The term is A B C F2(A, B, C) = A B C + A B C + A B C + A B C
28 Example: Interpretation of a Digital Circuit Here is a sample problem, taken from the textbook The Essentials of Computer Organization and Architecture by Linda Null and Julia Lobur. The task is to represent this circuit by both a Boolean expression and a Truth Table. Admittedly, this will prove to be a silly circuit.
29 Interpreting a Digital Circuit: Step 1 Label the circuit elements (I have chosen to use numbers) and label the output of each element. Note that we are slowly building a Boolean expression. The outputs of each gate are as follows: The output of gate 1 is (X + Y), The output of gate 2 is (Y Z), The output of gate 3 is X, The output of gate 4 is X + (Y Z), and The output of gate 5 is (X + Y) [X + (Y Z)]
30 Interpreting a Digital Circuit: Step 2 For a circuit of this complexity, the best next step is to make a Truth Table. X Y Z X + Y (Y Z) X X + (Y Z) (X + Y) [X +(Y Z)] We have now solved the problem. I want to continue and produce a simpler expression. (At least I think that it is simpler).
31 Interpreting a Digital Circuit: Step 3 Present the truth table without the intermediate expressions. Use the standard rules to convert the truth table to Canonical SOP. X Y Z F(X, Y, Z) F(X, Y, Z) = X Y Z + X Y Z + X Y Z + X Y Z F(X, Y, Z) = X Y Z + X Y Z + X Y Z + X Y Z + X Y Z = X Y (Z + Z) + (X + X ) Y Z + X Y Z = X Y + Y Z + X Y Z
32 Building a Digital Circuit for a Boolean Expression We take as examples two representations of the same Boolean expression. Sum of Products SOP One OR gate connecting the output of a number of AND gates.
33 Building a Digital Circuit (Part 2) Product of Sums POS One AND gate connecting the output of a number of OR gates. There are simpler Boolean expressions that are equivalent to both F2 and G2, which are equivalent to each other. We study simplification later.
34 The Tri State Buffer Some time ago, we considered relays as automatic switches. The tri state buffer is also an automatic switch. Here are the diagrams for two of the four most popular tri state buffers. An enabled low buffer is the same as an enabled high buffer with a NOT gate. What does a tri state buffer do when it is enabled? What does a tri state buffer do when it is not enabled? What is this third state implied by the name tri state?
35 An Enabled High Tri State Buffer Consider an enabled high tri state buffer, with the enable signal called C. When C = 1, the buffer is enabled. When C = 0, the buffer is not enabled. What does the buffer do? The buffer should be considered a switch. When C = 0, there is no connection between the input A and the output F. When C = 1, the output F is connected to the input A via what appears to be a non inverting buffer. Strictly speaking, when C = 0 the output F remains connected to input A, but through a circuit that offers very high resistance to the flow of electricity. For this reason, the state is often called high impedance, impedance being an engineer s word for resistance.
36 Sample Use of Tri State Buffers Here is a circuit that uses a pair of tri state buffers to connect exactly one of two inputs to an output. The effect of the circuit is at right. Here is the equivalent circuit using the standard gates.
37 What is This Third State? The following circuits show the effect of two tri states. Here we see two switches, either of which can illuminate the light. The analogy is not exact, but the point is valid: neither switch is attempting to assert zero volts.
38 Tristate Buffers: Defining Voltages Consider the following diagram in the situation when the control is low; C = 0. What is the voltage at the output of tristate buffer I? The voltage is not determined by that buffer, and is independent of A. As this point has a direct connection to the output of tristate buffer II, which is active, the voltage at that point is determined by that tristate. When many tristate buffers output to a common circuit line, at most one of them should be active at any time. Two or more active is an error.
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