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2 – Combinational Logic

© 1996 Gaetano Borriello

From Boolean expressions to logic gates (cont'd)

• NAND

• NOR

• XOR X ??Y

• XNOR X = Y

17

X

Y

Z

Z

X

Y

X

Y

Z

Z

X

Y

X xor Y = X Y' + X' YX or Y but not both ("inequality", "difference")

X xnor Y = X Y + X' Y'X and Y are the same ("equality", "coincidence")

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