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# Exam2 - steady-state analysis What kinds of hazards occur...

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Name _______________________ Exam 2 EEGR211 Spring 2002 – Dr. Ladeji-Osias Instructions: Students are allowed one 8.5x11 sheet of notes (one side). No other assistance is permitted. NO CALCULATORS. Attempt all questions to receive partial credit. 1. (10 points) Determine using Karnaugh maps, the minimal sum of products expression for the function, F = Π W,X,Y,Z (6,8,9,10,12,13,14) + d(11,15) (10 points) Implement your function using NAND gates only . Assume each variable and its complement is available as inputs to the function. 2. i. (5 points) What logic gate is equivalent to a 2-input XOR gate whose inputs are tied together? ii. (5 points) What logic gate is equivalent to a 2-input XNOR gate whose inputs are tied together? iii. (5 points) What is an application of a priority encoder? 3. (10 points) Timing hazards occur in a circuit when transient behavior of a logic circuit differs from
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Unformatted text preview: steady-state analysis. What kinds of hazards occur in a circuit and how can they be eliminated? (10 points) Eliminate any hazards in F = X’*Y’ + W’*Y + W*X*Z. 4. (15 points) Use the Quine-McCluskey method to obtain a minimal expression for F(A,B,C,D)= Σ (2,6,7,9,13,15). 5. Implement F(x,y,z) = Σ (3,4,5,7) using i. (10 points) a 4X1 MUX. Explain/demonstrate how the output of the MUX produces the correct function for inputs of 000 and 111. ii. (10 points) a 74x139 dual 2-to4 decoder. Explain/demonstrate how the output of the decoders produce the correct function for inputs of 000 and 111. 6. (10 points) What is an adder? What is the difference between a ripple adder and carry lookahead adder? Discuss the advantage of each type of adder....
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