PS02-soln - ECE 109 Spring 2010 Name Section Problem...

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ECE 109 Spring 2010 Name:__________________________________________ Section:______________________ Feb 8-12, 2010 1 Problem Session 2 1. [35 pts] Show the logic circuit implementation of this state diagram. 00 0 01 1 1 10 1 0 0 0 1 1 1 0 11 0 S1 S0 out 0 0 0 0 1 1 1 0 1 1 1 0 S1 S0 in S1’ S0’ 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 0 1 1 1 1 1 0 0 1 1 1 0 1 0 1 1 1 0 1 0 1 1 1 1 1 NOTE: For S1‟ and S0‟, there are fewer zeroes than ones, so I‟ve chosen to use NOR instead of OR. flipflop flipflop in out S0' S1' S1 S0
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ECE 109 Spring 2010 Name:__________________________________________ Section:______________________ Feb 8-12, 2010 2 2. [35 pts] For the state machine in the figure, show the following: 1. The truth table for the output Z. 2. The truth table for the next state (S1‟, S0‟). 3. The state diagram. S1 S0 Z 0 0 0 0 1 1 1 0 1 1 1 0 S1 S0 X S1’ S0’ 0 0 0 1 0 0 0 1 0 1 0 1 0 1 0 0 1 1 0 1 1 0 0 1 1 1 0 1 0 1 1 1 0 1 1 1 1 1 1 1 00 0 01 1 1 10 1 0 0 0 1 0,1 11 0 1
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ECE 109 Spring 2010 Name:__________________________________________ Section:______________________ Feb 8-12, 2010 3 3. [20 pts] Design a state machine that recognizes a specific letter of Morse Code. In case you‟re not familiar with Morse Code, here‟s some text from Wikipedia (http://en.wikipedia.org/wiki/Morse_code):
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This note was uploaded on 04/18/2010 for the course ECE 109 taught by Professor Bradley during the Spring '08 term at N.C. State.

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PS02-soln - ECE 109 Spring 2010 Name Section Problem...

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