ECE 2020 Midterm: ECE 2020 GT sp10 sw Exam 2
15 Feb 2019
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Instructions: this is a closed book, closed note exam. If you have a question, raise your hand and i will come to you. Please work the exam in pencil and do not separate the pages of the exam. Part a (6 points) define a 1 to 2 decoder by completing the behavior table. Part b (8 points) implement a 1 to 2 decoder using basic gates. Assume only true (non- complemented) inputs are available. 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 (in1, in0, en) and outputs (o0, o1, o2, o3). Consider a priority encoder with the following behavior: Part a (8 points) list the inputs (in0, in1, in2, and in3) in increasing priority. lowest priority. Part b (10 points) express the behavior of o0 in the map below. Derive a simplified sum of products expression using a karnaugh map.
