Abstract: A mask programmable integrated circuit having a plurality of iterative building blocks. Each building block has at least two adjacent basic base arrays. Each base array is comprised of an array of sites which, after personalization, form an array of logic blocks. Fabricated between the basic arrays is bridging circuitry. The generic layers of bridging circuitry are comprised of an array of sites. In order to fabricate the customized integrated circuit, personalization layers are fabricated over the generic layers. The personalization layers are arranged such that a particular integrated circuit design can utilize as many basic arrays as necessary to implement the desired logic functionality. After personalization, the bridging circuitry is comprised of logic blocks and interconnect.