Arizona State University questions
Chapter 5, problem 7: (10 pts) Consider the following circuit with an active high output decoder. Draw a truth table for X and Y in terms of a, b. and c. Chapter 5, problem 8: (15 pts) We wish to design a decoder, with three inputs, x, y, z, and eight active high outputs, labeled 0, 1, 2, 3, 4, 5, 6, 7. There is no enable input required. (For example, if xyz = 011, then output 3 would be 1 and all other outputs would be 0.) The only building block is a two-input, four output decoder (with an active high enable). Chapter 5, problem 9: (10 pts) We want to implement a full adder: we’ll call the inputs a, b, and c and the outputs s and cout. As always, the adder is described by the following equations: s(a, b, c) = m(1, 2, 4, 7) cout(a, b, c) = m(3, 5, 6, 7) To implement all this, all we have available are two decoders (as shown below) and two OR gates. Inputs a and b are available both uncomplemented and complemented; c is available only uncomplemented. Show a block diagram for this system. Be sure to label all of the inputs to the decoders. Chapter 5, problem 12: (10 pts) Implement the function f(x, y, z) = Σm(0, 1, 3, 4, 7) using 2:1 multiplexers. Chapter 5, problem 14: (5 pts) The following circuit includes a multiplexer with select inputs A and B, and data inputs W, X, Y, and Z. Write an algebraic equation for F. A B W X Y Z F Chapter 5, problem 15: (5 pts) For the following sets of functions, design a system using a (P)ROM as a function generator a) F(A,B,C) = Σm(3,4,5,7) G(A,B,C) = Σm(1,3,5,6,7) H(A,B,C) = Σm(1,4,5) Chapter 5, problem 16: (15 pts) We have found a minimum sum of products expression for each of the two functions, F and G, minimizing them individually (no sharing): F = W’X’Y’ + XY’Z + W’Z G = WY’Z + X’Y’ a) Implement them with a (P)ROM. c) For the same function, we have available as many of the decoders as described below as are needed plus 2 eight-input OR gates. Show a block diagram for this implementation. All inputs are available both uncomplemented and complemented.
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