An Optically Differential Reconfigurable Gate Array (ODRGA) was developed to achieve a partial dynamic reconfiguration capability. This paper proposes a novel optically and electrically controlled logic block structure suitable for ODRGAs. In addition, it presents a design of an optically differential reconfigurable gate array VLSI chip with 4 optically and electrically controlled logic blocks, 5 switching matrices, and 12 optically and electrically controlled I/O bits using 0.35 mum 3-Metal CMOS technology.