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ee101_hw8

# ee101_hw8 - EE 101 Homework 8 Fall 09 Redekopp Name Due...

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1 EE 101 Homework 8 Fall ’0 9 ● Redekopp Name: _________________________________________ Lecture 9:30 / 11:00 / 2:00 Due: Tues. Dec. 1 st in class Score: ________ Show work to get full credit. Remember, use on only one side of the paper and staple them together. Only use a calculator to CHECK your work, not to DO your work. NOTE: PLEASE DRAW ALL DIAGRAMS NEATLY. MAKE SURE TO WRITE IN THE DEVICE LABELS AND SYSTEM LABELS 1. (15 pts.) Using (1) 74LS85 comparator and basic logic gates, design a circuit that accepts a 4-bit unsigned number, X[3:0] and produces a 4-bit, unsigned output Y[3:0] such that Y = X, if X < 7 0, otherwise. 2. (35 pts.) Build a circuit that takes in 3 ASCII characters, A[6:0], B[6:0], and C[6:0] and produces a 2’s complement output Z[5:0]. Inputs A and C will be ASCII characters for a decimal digit (0-9). B will be the A SCII character for ‘+’ or ‘ - . Refer to the ASCII table in your lecture notes for the ASCII representation of 0 - 9 ’ and ‘+’ and ‘ - . Z should equal the correct sum or difference of A and

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