Patent ID: 7358616

Claim:
A semiconductor comprising: a first layer of circuitry having a predetermined circuit layout for implementing predetermined functions and having a reciprocal design symmetry about a first axis; a first plurality of contact pads overlying the first layer of circuitry, at least a portion of the first plurality of contact pads making electrical connection to the first layer of circuitry; a second plurality of contact pads in electrical contact with at least a portion of the first plurality of contact pads; and a second layer of circuitry having a reciprocal circuit layout of the predetermined circuit layout of the first layer of circuitry overlying the first layer of circuitry in reciprocal orientation, the second layer of circuitry making electrical connection to at least a portion of the second plurality of contact pads, wherein the second layer of circuitry has the reciprocal orientation of the reciprocal circuit layout by rotating the reciprocal circuit layout about a second axis and overlaying a resulting rotated second layer of circuitry and the second plurality of contact pads onto the first plurality of contact pads.