Creating a circuit with only NOR gates

crutschow

Joined Mar 14, 2008
24,978
When using only one type of gate, I like to think of DeMorgan's rule as being that a NOR gate for positive logic becomes a NAND gate for negative logic.
Similarly, a NAND gate for positive logic becomes a NOR for negative logic.
So you look where you need NAND and NOR gates, and then invert the logic as needed.
Once you have that, then you can then simplify by eliminating unnecessary inverters.

If you start with your original logic configuration and go from there, with the above in mind, you should be able to see the simplest way to do it all with NOR gates.
 
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