I know logical ADD in binary is 0010, and logical AND in binary is 0000. How do I go from this to a full operation?
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There's two control lines:
Ainvert, andBnegate, which can be used to invert values before combining them.Use them as needed!
The
Bnegatecontrol line does these two things:binput to~b, which is then fed to the other circuits as theb-side/lower input.+.The combined effect of
Bnegatewith the+Operation, will accomplisha + ~b + 1, which is the same asa-band alsoa + -b, because in two's complement, -x = ~x+1.Though we can, we don't have to use the
+withBnegate, as others operations are still available.Given this logic diagram, what are some things that cannot be done?
a + ~b(though~a + bcan be done)a | -ba & -b-a + b