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Unformatted text preview: 11507 ECE 3441 Homework #8 8.8 A=Z, B=0, C=X, D=Z, O=0, E=Z, F=X+0+0=X, G=(0Z)'=1, H=(X+1)'=0 8.9 For A=B=C=1, F(A,B,C)=(A+B'+C')(A'+B+C')(A'+B'+C)=1 In the figure, F=0 so there is something wrong with the circuit. Since the inputs to the last NOR gate are (1,0,0); the output of NOR gate 4 (the function output), is correct. The gate that must be malfunctioning or is incorrectly wired is gate 1. 8.10 a) F(A,B,C,D)= X AB CD 00 01 11 10 1 m(0,2,5,6,7,8,9,12,13,15) 00 1 01 11 1 10 1 1 1 1 1 1 1 F(A,B,C,D)=AC'+BD +A'CD'+A'B'D' with 1hazards between minterms 1&8 and 6&7 OR A'BC+A'B'D' with 1hazards between minterms 1&8 and 2&6 F with no hazards would be: F(A,B,C,D)=AC'+BD+A'BC+A'CD'+A'B'D'+B'C'D' b) AB CD 00 01 11 10 00 01 0 0 0 0 0 0 11 10 F(A,B,C,D)=(A+B+D')(A'+C'+D)(A'+B+C')(A+B'+C+D) With 0hazard between maxterms 3&11 F without hazards: F(A,B,C,D)=(A+B+D')(A'+C'+D)(A'+B+C')(A+B'+C+D)(B+C'+D') ...
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This note was uploaded on 04/14/2008 for the course ECE 3441 taught by Professor Markenscoff during the Fall '07 term at University of Houston.
 Fall '07
 Markenscoff

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