4 Full Adders with Logic Gates

157

01:39:13

Full adders that can add or subtract. Using a XOR with input 0 allows adding and input 1 allows subtracting.  XOR allows flipping input B, adding 1 to first adder, adding B to input A, than ignoring the last carry of the last adder thus you have binary subtraction too. 

published 9 years ago

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