exam1-a-spr10-soln

exam1-a-spr10-soln - ECE 109 NC State University Exam 1(A...

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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ECE 109 Name:____________________________________________ NC State University (Print legibly at least first initial and last name.) Exam 1(A): 16 February 2010 Section:________________ Exam 1 (Version A) This is a closed book and closed notes test. You are not allowed to have anything on your desk other than pencil and paper during the test. No calculators or electronic assistance of any kind. Failure to abide by this policy will result in a zero on the exam and will be treated as a violation of the NCSU Code of Student Conduct. You must show all of your work on this exam. You will not be allowed to turn in additional sheets of paper. If you need more space for a problem use the back of the same page . Write your name on every sheet of this exam. Read and sign the following statement. Failure to sign the statement will result in a zero on the exam. I have neither given nor received unauthorized assistance on this test. I have notified the proctor of any violations of the above policies. Signature: __________________________________________________ Question Points Score 1 12 2 8 3 12 4 12 5 10 6 16 7 15 8 15 TOTAL 100 Except for name, signature, and section number, DO NOT WRITE ON THIS PAGE.

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AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ECE 109 Name:____________________________________________ NC State University (Print legibly at least first initial and last name.) Exam 1(A): 16 February 2010 2 1. (12 points) Create a logic function that takes in a 4- bit two’s complement integer (D[3:0]) and generates an output (Mul3) that is 1 when the input is a multiple of 3. Complete the truth table below, and draw a combinational logic circuit (using AND, OR, etc.) that implements the function.
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