Patent ID: 8174103

Claim:
An apparatus comprising: a carrier for attaching chips; a first chip comprising: a first circuit in a first circuitry region, the first circuitry region being nearer a first surface of the first chip than to a second surface of the first chip, the second surface of the first chip opposite to the first surface of the first chip; a first connector on the first surface of the first chip, the first connector connected to the first circuit; a second chip comprising: a second circuit in a second circuitry region, the second circuitry region being nearer to a first surface of the second chip corresponding to the first surface of the first chip than to a second surface of the second chip, the second surface of the second chip opposite to the first surface of the second chip, the second circuit being identical to the first circuit; a second connector on the second surface of the second chip, the second connector connected to the circuit in the second circuitry region of the second chip by a through silicon via (TSV); the first chip attached to the carrier by the first connector; the second chip inverted relative to the first chip and attached to the carrier by the second connector; and a conductor on the carrier connecting the first and second connectors.