4x4 bit multiplier using NOR gates

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Jofrey

Joined Dec 6, 2020
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Hi everyone.
I have to create a multiplier circuit.
The multiplier must have two 4-bit inputs and an 8-bit output.
Only NOR gates are allowed (hint: create subcircuits for the other gates, using only NOR, and use your subcircuit in the multiplier).

This is my circuit. I did it on Logisim. As in the exercise i had to use only NOR gates, so I created complementary circuits (AND, FULL ADDER, HALF ADDER, using NOR gates).
However, my circuit is wrong and I can't find its error.
4 by 4 multiplier.png





Complementary circuits using NOR gates


AND

and using NOR gates.png


FULL ADDER

full adder using NOR gates.png




HALF ADDER

hal adder using NOR gates.png
 
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