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Unformatted text preview: 1 Fundamentals of Digital System Design ECE/CS 3700 Practice Exam for the final Spring 2009 Note: Time yourself for 2 hours. 30 total points. Closed book, closed notes, open minds. Do not panic. Good luck. 1. Study Section 7.15, pp. 470, and study (solved) example 7.22 pp. 476, so you understand setup, hold times and propagation delays well. 2. (5 points) You are asked to design a vending machine controller that dispenses gum (G) or coke (C). Both items cost 15 cents. The machine takes only nickles (N) or dimes (D), one at a time. The machine operates as follows: First, 15 cents have to be deposited. Then, select input G or C. If G or C is asserted before 15 cents have been deposited, nothing happens. When input G is selected, G = 1 AND C = 0. When C is selected, G = 0 and C = 1. Assume that the sensors are designed in such a way that condition G = C = 1 will never occur. The machine doesnt dispense any change. If you deposit 20 cents and select an item, youre out of 5 cents.The machine doesnt dispense any change....
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This note was uploaded on 04/26/2010 for the course ECE ECE 3700 taught by Professor Priyankkalla during the Spring '09 term at University of Utah.
- Spring '09