sp10-sw-s2 - ECE 2030 A 10:00am 4 problems, 4 pages...

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ECE 2030 A 10:00am Computer Engineering Spring 2010 4 problems, 4 pages Exam Two Solution 10 March 2010 Problem 1 (3 parts, 24 points) Decoding Decoders Part A (6 points) Define a 1 to 2 decoder by completing the behavior table. IN EN O0 O1 X 0 0 0 0 1 1 0 1 1 0 1 IN EN O0 O1 1 to 2 decoder Part B (8 points) Implement a 1 to 2 decoder using basic gates. Assume only true (non- complemented) inputs are available. Label all inputs and outputs. Part C (10 points) Using only the three 1 to 2 decoders shown below, implement a 2 to 4 decoder with an enable. Label the decoder inputs (IN 1 , IN 0 , EN) and outputs (O0, O1, O2, O3). IN EN O0 O1 1 to 2 decoder IN EN O0 O1 1 to 2 decoder IN EN O0 O1 1 to 2 decoder O0 O1 O2 O3 IN0 IN1 EN 1
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ECE 2030 A 10:00am Computer Engineering Spring 2010 4 problems, 4 pages Exam Two Solution 10 March 2010 Problem 2 (2 parts, 18 points) "Get your priorities right!" Consider a priority encoder with the following behavior: In 3 In 2 In 1 In 0 Valid O 1 O 0 0 0 0 0 0 X X X X X 1 1 0 0 X X 1 0 1 0 1 X 1 0 0 1 1 0 1 0 0 0 1 1 1 Part A (8 points) List the inputs (In 0 , In 1 , In
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sp10-sw-s2 - ECE 2030 A 10:00am 4 problems, 4 pages...

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