Patent ID: 8680582

Claim:
An integrated circuit die, comprising: a plurality of sets of pads, each set comprising two pads, wherein each pad in the plurality of sets of pads is configured for external connection; a circuit; a plurality of sets, of controllable impedance devices, each controllable impedance device in the plurality of sets of controllable impedance devices coupling a respective one of the pads in the plurality of sets of pads to the circuit, each controllable impedance device in the plurality of sets of controllable impedance devices configured to have an impedance controlled responsive to a respective control signal, the controllable impedance devices in the plurality of sets of controllable impedance devices coupled to one of the pads of each of the plurality of sets of pads being coupled to a common signal line and being configured to receive the control signal through the common signal line; and a programmable element configured to control the impedances of the plurality of controllable impedance devices in the plurality of sets of controllable impedance devices by providing the control signal to the common signal line.