In a 4 input NAND gate, two inputs are to be used. What are the options available for the unused inputs? Which one is the best and why? - Quora
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integrated circuit - How to invert a NAND gate IC and have it work like an AND gate IC? - Electrical Engineering Stack Exchange
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VHDL Tutorial – 5: Design, simulate and verify NAND, NOR, XOR and XNOR gates using AND-OR-NOT gates in VHDL
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