# Tutorial 6 - and where output is the 2’s complement of...

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EE 2000 Logic Circuit Design, Semester A, 2008/09 Tutorial 6 Week 7 (13 th , 15 th , 16 th October, 2008) The questions are divided into three levels. Level 1 is the review questions. You should able to answer them after attending the lecture. Level 2 is the problems. You should take a revision of the book before answering them. Level 3 is challenge exercise. They are advanced problems. Please be prepared before the tutorial. Level 1: Review Questions Question I: The following K-map is given to you. ab cd 00 01 11 10 00 01 1 11 1 1 1 10 1 (a) Find the minimized logic function given by the above K-map. (b) Modify your design such that circuit timing hazard does not exist. Level 2: Problems Chapter 4, problem 3: Design a BCD-to-decimal decoder which gives an output of all 0s when any invalid input combination occurs. Chapter 4, problem 22: Design a combinational circuit whose input is a 4-bit number

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Unformatted text preview: and where output is the 2’s complement of the input number. Level 3: Challenge Exercise Question II: A burglar alarm is designed so that it senses four input signal lines. Line A is from the secret control switch, line B is from a pressure sensor under a steel safe in a locked closet, line C is from a battery-power clock, and line D is connected to a switch on the locked closet door. The following conditions produce logic 1 voltage on each line. A : The control switch is closed. B : The safe is in its normal position in the closet. C : The clock is between 10:00 and 14:00 hours. D : The closet door is closed. Write the expression for the burglar alarm that produces a logic-1 (rings a bell) when the safe is moved and the control switch is closed, or when the closet is opened after banking hours, or when the closet is opened with the control switch open....
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## This note was uploaded on 02/06/2011 for the course EE 2000 taught by Professor Vancwting during the Spring '07 term at City University of Hong Kong.

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Tutorial 6 - and where output is the 2’s complement of...

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