A Reconfiguration Speed Adjustment Technique for ORGAs with a Holographic Memory

Optically reconfigurable gate arrays (ORGAs), which consist of a gate array VLSI, a holographic memory, and a laser diode array, are a type of programmable gate array. The gate array of ORGAs is optically reconfigured using diffraction patterns from a holographic memory that is addressed by a laser diode array. In previously proposed ORGAs, the optical reconfiguration speed has been designed to be constant by assuming a worst-case reconfiguration speed. However, the diffraction efficiency of a holographic memory varies depending on the pattern of reconfiguration contexts that is recorded in it. Therefore, this paper proposes a reconfiguration speed adjustment technique for ORGAs to accelerate the reconfiguration speed. In addition, the advantages are discussed from some simulation results of a holographic memory and the experimental results of a fabricated gate array VLSI.