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fa99-sw-e3 - ECE 2030 4 problems 5 pages Computer...

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ECE 2030 Computer Engineering Fall 2099 4 problems, 5 pages Exam Three 17 November 2099 1 Name (print) _____________________________________________________ 1 2 3 4 total 25 30 20 25 100 This exam is certified Y2K compliant.
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ECE 2030 Computer Engineering Fall 2099 4 problems, 5 pages Exam Three 17 November 2099 2 Problem 1 (2 parts, 25 points) Counting Your Blessings Part A (12 points) Design a toggle cell using only transparent latches, a 4-to-1 mux, and an inverter. Use icons for the latch and mux. Your toggle cell should have an active high toggle enable input TE , and an active low clear input -Clear , clock inputs Φ 1 and Φ 2 , and an output Out . Label all signals. The clear signal should take precedence over the toggle enable. I 0 I 1 I 2 I 3 S 1 S 0 Out latch En In Out latch En In Out Part B (13 points) Now combine three of these toggle cells to build a divide by five counter. Your counter should have active high external clear and external count enable inputs, a max count and three count outputs O 2 , O 1 , O 0 . Be sure your design can be cascaded. Use any basic gates (AND, OR, NAND, NOR, & NOT) you require. Assume clock inputs to the toggle cells are already connected.
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