US Patent 7902869 Extensible three dimensional circuit

An extensible three dimensional circuit includes an access layer and crossbar arrays overlying the access layer. The crossbar arrays are formed from tiled mini-arrays of crossing lines and electrically accessed by the access layer. The crossing lines comprise at least one bundle of traveling lines, the at least one bundle of traveling lines moving through the circuit both laterally and vertically. Programmable crosspoint devices are disposed between the crossing lines.