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ECE 320 Homework #5

ECE 320 Homework #5. Construct a 5x32 decoder with four 3x8 decoders and a 2x4 decoder. (Use a block diagram) Design a combinational circuit that generates the 9’s complement of a BCD digit A combinational circuit is designed by the following three functions: F 1 =x’y’+xyz’ F 2 =x’+y

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ECE 320 Homework #5

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  1. ECE 320 Homework #5 • Construct a 5x32 decoder with four 3x8 decoders and a 2x4 decoder. (Use a block diagram) • Design a combinational circuit that generates the 9’s complement of a BCD digit • A combinational circuit is designed by the following three functions: F1=x’y’+xyz’ F2=x’+y F3=xy+x’y’ Design the circuit with a decoder and some external gates. • Using 4 exclusive-OR gates and a four bit full adder, construct a 4-bit parallel adder/subtractor. Use an input select variable V so that when V=0, the circuit adds and when V=1, the circuit subtracts. (Use 2’s complement for subtraction)

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