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Unformatted text preview: Lab 4 Page 2 5) A combinational circuit is used to control a seven-segment display of decimal digits as shown. The circuit has four inputs, which provide the four-bit code used in packed decimal representation (010 = 00002, . .910=10012). The seven outputs a to g define which segments will be activated to display a given decimal digit. For example, when the input is 010 = 00002, the outputs a to f are activated; when the input is 110 = 00012, the outputs b and c are activated; when the input is 210 = 00102, the outputs a , b , d , e and g are activated. (i) Develop a truth table for this circuit for all decimal digits. (ii) Use Karnaugh map to derive an expression for the output a without using don’t care conditions. (iii) Use Karnaugh map to derive an expression for the output a using don’t care conditions....
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This note was uploaded on 08/18/2011 for the course COMP 3868 taught by Professor Keithchan during the Summer '97 term at Hong Kong Polytechnic University.
- Summer '97