A Sixteen-Context Dynamic Optically Reconfigurable Gate Array

Demand for fast dynamic reconfiguration has increased since dynamic reconfiguration can accelerate the performance of implementation circuits on a programmable device. Such dynamic reconfiguration necessitates two important features: fast reconfiguration and numerous contexts. However, because fast reconfiguration and numerous contexts share a tradeoff relation on current VLSIs, optically reconfigurable gate arrays (ORGAs) have been developed to resolve this dilemma.ORGAs can realize a large virtual gate count that is much larger than those of current VLSI chips by exploiting the large storage capacity of a holographic memory. Furthermore, ORGAs can realize fast reconfiguration through use of large bandwidth optical connections between a holographic memory and a programmable gate array VLSI. Among such developments, we have been developing dynamic optically reconfigurable gate arrays (DORGAs)that realize a high gate density VLSI using a photodiode memory architecture. This paper presents the first demonstration of a 16-context DORGA architecture. Furthermore, we present experimental results: 530–833 ns reconfiguration times and 5-9.375 us retention times.