A dynamic optically reconfigurable gate array with a silver-halide holographic memory

To increase gate density, a dynamic optically reconfig-urable gate array (DORGA) architecture has been proposed that uses the junction capacitance of photodiodes as dynamic memory, thereby obviating the static configuration memory. To date, estimation of the DORGA architecture using a liquid crystal holographic memory has been conducted, thereby demonstrating its availability. However, because the resolution of the liquid crystal holographic memory is very low and because the storable configuration contexts are numerically limited to four, that estimation cannot be considered a practical experiment. Therefore, this paper presents a practical demonstration of the DORGA architecture using a silver-halide holographic memory that can store over 3,000 configuration contexts. The DORGA architecture performance, in particular the reconfiguration context retention time, was analyzed experimentally. The advantages of this architecture are discussed in relation to the results of this study.