Description12-input OR gate via NOR and NAND gates.svg
English: An implementation of a cascaded implementation, which used de Morgan's laws to convert or(or(a,b,c),or(d,e,f),or(g,h,i)) into nand(nor(a,b,c),nor(d,e,f),nor(g,h,i)). This is more efficient on logic families such as CMOS, NMOS or TTL where an OR gate needs to be synthesized from a NOR gate and an inverter.
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Captions
An implementation of a 12-input OR gate via NOR and NAND gates