Patent ID: 6886143

Claim:
A mask-programmed logic device comprising: a mask-programmable base device including: an array of mask-programmable logic regions, a plurality of input/output areas, and a plurality of drivers for a device-wide network for distribution of device-wide signals among said logic regions and said input/output areas; and programming metallization layers that: (a) program said mask-programmable logic regions, (b) connect said plurality of drivers to form said device-wide network, and (c) provide interconnections between and among said mask-programmed logic areas and said input/output areas; wherein: said interconnections provided by said programming metallization layers include routing for high-fanout signals; said device-wide network is optimized for said base device, independent of programming, to minimize skew of said device-wide signals; and said routing for high-fanout signals is optimized for said device as programmed by said programming metallization layers.