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Transcript of Chapter 5 Boolean Algebra and Reduction Techniques William Kleitz Digital Electronics with VHDL,...
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Chapter 5
Boolean Algebra and Reduction Techniques
William KleitzDigital Electronics with VHDL, Quartus® II Version
Copyright ©2006 by Pearson Education, Inc.Upper Saddle River, New Jersey 07458
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Combinational Logic
• Using two or more logic gates to form a more useful, complex function
• A combination of logic functionsB = KD + HD
• Boolean ReductionB = D(K+H)
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Boolean Laws and Rules• Commutative law of addition
A + B = B + A
• Associative law of additionA + (B + C) = (A + B) + C
• Distributive lawA(B + C) = AB + AC
• Equivalent circuits– See Figures 5-9 to 5-14
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Figure 5-9
Figure 5-10
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Figure 5-11
Figure 5-12
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Figure 5-13
Figure 5-14
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Boolean Laws and Rules
• Rule 1: Anything ANDed with a 0 is equal to 0
• Rule 2: Anything ANDed with a 1 is equal to itself - Figure 5-16
• Rule 3: Anything ORed with a 0 is equal to itself - Figure 5-17
• Rule 4: Anything ORed with a 1 is equal to 1 - Figure 5-18
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Figure 5-16
Figure 5-17
Figure 5-18
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Boolean Laws and Rules
• Rule 5: Anything ANDed with itself is equal to itself - Figure 5-19
• Rule 6: Anything ORed with itself is equal to itself - Figure 5-20
• Rule 7: Anything ANDed with its own complement equals 0 - Figure 5-21
• Rule 8: Anything ORed with its own complement equals 1 - Figure 5-22
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Figure 5-19 Figure 5-20
Figure 5-21 Figure 5-22
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Boolean Laws and Rules
• Rule 9: Anything complemented twice will return to its original logic level - Figure 5-23
• Rule 10:– A + AB = A + B– A + AB = A + B– See Table 5-1
• Law and Rule Summary - See Table 5-2William KleitzDigital Electronics with VHDL, Quartus® II Version
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Figure 5-23
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William KleitzDigital Electronics with VHDL, Quartus® II Version
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William KleitzDigital Electronics with VHDL, Quartus® II Version
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Simplification of Combinational Logic Circuits Using Boolean
Algebra• Equivalent circuits can be formed with
fewer gates
• Cost is reduced
• Reliability is improved
• Use laws and rules of Boolean Algebra
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Using Quartus II To Determine Simplified Equations
• The software will determine the simplest form before synthesizing– eliminates unnecessary inputs– minimizes gates used in CPLD
• Quartus II solution to example 5-9– see figures 5-32 (a) and (b)
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Figures 5-32 (a) and (b)
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Using Quartus II To Determine Simplified Equations
• If the program determines an input is not necessary, a warning message will be displayed when the program is compiled– See figure 5-33
• The floor plan view provides implementation details– The Equations Section, see figure 5-35– Arithmetic operators:
• & AND• ! NOT• # OR• $ Exclusive OR
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Using Quartus II To Determine Simplified Equations
• Floorplan Editor Display– alternate way to view reduced logic equation– useful for viewing and modifying pin and
macrocell assignments
• Logic Array Block (LAB) view shows interconnections and equations
• See figure 5-36(b)
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Figure 5-36(b)
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DeMorgan’s Theorem
• To simplify circuits containing NAND and NOR gates
• A B = A + B
• A + B = A B
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DeMorgan’s Theorem
• Break the bar over the variables and change the sign between them
• Inversion bubbles - used to show inversion rather than inverters
• Use parentheses to maintain proper groupings
• End up with Sum-of-Products (SOP) form
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DeMorgan’s Theorem
• Bubble Pushing– See Figure 5-60– shortcut method of forming equivalent gates
– change the logic gate• (AND to OR or OR to AND)
– Add bubbles to the inputs and outputs where there were none and remove original bubbles
William KleitzDigital Electronics with VHDL, Quartus® II Version
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Figure 5-60
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Entering a Truth Table in VHDL Using a Vector Signal
• Truth table to be entered, table 5-5– define internal signal to represent the three inputs
– the three inputs will be grouped as a 3 bit vector
– the use of comments to document a program
– use selected signal assignments, built to look like truth table entries
• see figure 5-62
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Figure 5-62
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The Universal Capability of NAND and NOR Gates
• NANDs can be combined to form all other gates– See Figures 5-68, -69, -71, -73, and -74
• NORs can be combined to form all other gates– See Figure 5-75
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Figure 5-68 Figure 5-69
Figure 5-73
Figure 5-71
Figure 5-74
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Figure 5-75
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AND-OR-INVERT Gates for Implementing Sum-of-Products
Expressions
• Product-of-sums (POS) form
• Sum-of-products (SOP) form– can easily be implemented using an AOI gate
• TTL and CMOS AOI devices are available
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Karnaugh Mapping
• To minimize the number of gates
• Reduce circuit cost
• Reduce physical size
• Reduce gate failures
• Requires SOP form
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Karnaugh Mapping
• Graphically shows output level for all possible input combinations
• Moving from one cell to an adjacent cell, only one variable changes
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Karnaugh Mapping
• Transform the Boolean equation into SOP form
• Fill in the appropriate cells of the K-map
• Encircle adjacent cells in groups of 2, 4 or 8– watch for wraparound
• Find terms by which variables remain constant within circles
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System Design Applications
• Use Karnaugh Mapping to reduce equations
• Use AND-OR-INVERT gates to implement logic
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Summary
• Several logic gates can be connected together to form combinational logic.
• There are several Boolean laws and rules that provide the means to form equivalent circuits.
• Boolean algebra is used to reduce logic circuits to simpler equivalent circuits that function identically to the original circuit.
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Summary
• DeMorgan’s theorem is required in the reduction process whenever inversion bars cover more than one variable in the original Boolean equation.
• NAND and NOR gates are sometimes referred to as universal gates, because they can be used to form any of the other gates.
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Summary
• AND-OR-INVERT (AOI) gates are often used to implement sum-of-products (SOP) equations
• Karnaugh mapping provides a systematic method of reducing logic circuits.
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Summary
• Combinational logic designs can be entered into a computer using graphic design software or VHDL.
• Using vectors in VHDL is a convenient way to group like signals together similar to an array.
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Summary
• Truth tables can be implemented in VHDL using vector signals with the selected signal assignment statement.
• Quartus II can be used to determine the simplified equation of combinational circuits.
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