Friday 10 October 2014

digital logic - Why All 1's used as a second input in decrement operation of ALU?


Suppose the first four data inputs are X (X0, X1, X2, X3) and the second four data inputs are Y (Y0, Y1, Y2, Y3) in a 4-bit ALU. Why "All 1's" are used as an input for Y in the decrement operation of ALU?




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