Digital Electronics - Engineering

Q1:

Two 2's complement number having sign bits X and Y are added and the sign bit of the result is Z. then, the occurrence of overflow is indicated by the Boolean function.

A XYZ

B
X Y Z

C
X YZ + XY Z

D XY + YZ + ZX

ANS:D - XY + YZ + ZX

carry of a one bit full order is given by expression XY + YZ + ZX.