Patent ID: 8217521

Claim:
A hardwired switch of a die stack, comprising: a first landing pad disposed on a first surface of a first die; a second landing pad disposed on the first surface and electrically connected to the first landing pad; a third landing pad disposed on the first surface; a fourth landing pad disposed on the first surface and electrically connected to the third landing pad; a fifth landing pad disposed on a second surface of the first die, wherein the first landing pad and the fifth landing pad partially or fully overlap in a vertical direction of the first die; a sixth landing pad disposed on the second surface, wherein the second landing pad and the sixth landing pad partially or fully overlap in the vertical direction of the first die; a seventh landing pad disposed on the second surface and electrically connected to the sixth landing pad, wherein the third landing pad and the seventh landing pad partially or fully overlap in the vertical direction of the first die; and an eighth landing pad disposed on the second surface and electrically connected to the fifth landing pad, wherein the fourth landing pad and the eighth landing pad partially or fully overlap in the vertical direction of the first die.