Patent ID: 7679198

Claim:
An integrated circuit die, comprising: a plurality of sets of bonding pads fabricated on a surface of the die, each set including at least two bonding pads; a circuit fabricated on the die; a respective controllable impedance device connecting each of the bonding pads in each set to the circuit, the impedance of each of the controllable impedance devices being configured to be electrically controlled responsive to receiving a respective control signal, the respective controllable impedance devices coupled to one of the bonding pads of each of a plurality of sets being coupled to a common signal line and being coupled to receive the control signal through the common signal line; a respective through wafer interconnect extending from at least one of the bonding pads in each set to a surface of the die opposite the surface on which the bonding pads are fabricated; and a programmable element in the circuit, the programmable element being configured to be programmed to apply the control signal to the common signal line.