Patent ID: 8711573

Claim:
A method of selecting a semiconductor device in a stack of semiconductor devices, comprising: providing logic levels to a first plurality of serial through silicon via (TSV) inputs on a first device in a stack; within the first device, receiving the logic levels on the first plurality of TSV inputs, scrambling the received logic levels, and providing the scrambled received logic levels to a first plurality of TSV outputs connected to a first plurality of serial TSV inputs on a second device in the stack; within the second device, receiving the logic levels on the first plurality of TSV inputs, scrambling the received logic levels, and providing the scrambled received logic levels to a first plurality of TSV outputs connected to a first plurality of serial TSV inputs on a third device in the stack; within the third device, receiving the logic levels on the first plurality of TSV inputs; and using the received logic levels in each of the first, second, and third devices to select one of the first, second, or third devices.