ECE 3130 Digital Electronics and Design

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Presentation transcript:

ECE 3130 Digital Electronics and Design Lab 5: Subtractors Fall 2017 Priyankar Roychowdhury

Lab#5 Objectives Build and simulate a full subtractor. Two XORs Two Inverters Two ANDs = NAND + Inverter One OR = NOR + Inverter Build and simulate a 4-bit subtractor.

Full Subtractor Truth Table A B B_in D B_out 1 Half Subtractor Implementation A B B_in D B_out 1 Half Subtractor

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Full Subtractor – test circuit

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4-bit Subtractor - schematic

4-bit Subtractor – simulation Test your 4-bit subtractor by setting up inputs: A=0101, B=1101, Borrow_in=1 Simulate it and check the results, which should be: D=0111, Borrow_out=1 P.S. A=0101 means A0=1, A1=0, A2=1, A3=0

4-bit Subtractor – test circuit

4-bit Subtractor – waveforms