fa08-sl-e3 - ECE 2030 12:00pm 4 problems 6 pages Computer...

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ECE 2030 12:00pm Computer Engineering Fall 2008 4 problems, 6 pages Exam Three 21 November 2008 1 Instructions: This is a closed book, closed note exam. Calculators are not permitted. 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. For maximum credit, show your work. Good Luck! Your Name ( please print ) ________________________________________________ 1 2 3 4 total 22 30 22 26 100
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ECE 2030 12:00pm Computer Engineering Fall 2008 4 problems, 6 pages Exam Three 21 November 2008 2 Problem 1 (2 parts, 22 points) Counters Part A (10 points) Design a toggle cell using two transparent latches, two 2 to 1 muxes, and one inverter. 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 . The - Clear signal has precedence over TE . Label all signals. Also complete the behavior table for the toggle cell. TE Out CLR Φ 1 Φ 2 TE -Clear CLK Out 0 0 ↑↓ 1 0 ↑↓ 0 1 ↑↓ 1 1 ↑↓ Part B (12 points) Now combine these toggle cells to build a divide by six counter. Your counter should have an external clear, external count enable, and three count outputs O 2 , O 1 , O 0 . Use any basic gates (AND, OR, NAND, NOR, & NOT) you require. Assume clock inputs to the toggle cells are already connected. Your design must support multi-digit systems.
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fa08-sl-e3 - ECE 2030 12:00pm 4 problems 6 pages Computer...

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