NAND的真值表:
XOR的真值表:
NOT = X NAND X
XOR = XY' + X'Y
= [(XY')(X'Y)]'
= [X NAND (Y NAND Y)] NAND [(X NAND X) NAND Y]
用兩個NAND做
= XY' + XX' +YY' + X'Y
= X(X'+Y') + Y(X'+Y')
= X(XY)' + Y(XY)'
= {[X(XY)']'[Y(XY)']'}'
= [X NAND (X NAND Y)] NAND [Y NAND (X NAND Y)]
用一個NAND做 |