US Patent 7222325 Method for modifying an integrated circuit

An application specific integrated circuit has at least one standard cell, integrated circuit connection circuitry connected to the at least one standard cell and at least one programmable circuit that is connected or selectively connectable to the integrated circuit connection circuitry. The selected connection is made by metal mask changes if and when it is desirable to change the logic of the application specific circuit. The programmable circuit is a general-purpose logic block and may be reprogrammed to effect design changes.