Conventional Optically Reconfigurable Gate Arrays Research Articles

Optical configuration acceleration on a new optically reconfigurable gate array very large scale integration using a negative logic implementation

This paper presents a proposal of an optical configuration acceleration method applied to optically reconfigurable gate arrays (ORGAs) using a negative logic implementation. The gate array of an ORGA is reconfigured using a holographic memory. The reading time of a holographic memory depends on the number of bright bits included in a configuration context. The proposed optical configuration acceleration method can decrease the number of bright bits. As a result, the proposed optical configuration acceleration method can increase the reconfiguration frequency. In this paper, a fabricated ORGA very large scale integration that can support the optical configuration acceleration method is estimated. Consequently, this paper shows that the reconfiguration frequency of the proposed method is 1.97 times higher than those of conventional ORGA architectures with no increase of laser power.

Programmable optically reconfigurable gate array architecture and its writer

Recently, optically reconfigurable gate arrays (ORGAs), which consist of a gate array VLSI, a holographic memory, and a laser array, have been developed to achieve huge virtual gate counts that vastly surpass those of currently available VLSIs. By exploiting the large storage capacity of a holographic memory, VLSIs with more than 1 teragate counts will be producible. However, compared with current field programmable gate arrays, conventional ORGAs have one important shortcoming: they cannot be reprogrammed after fabrication. To reprogram ORGAs, a holographic memory must be disassembled from its ORGA package, then reprogrammed outside of the ORGA package using a holographic memory writer. It must then be implemented onto the ORGA package with high precision techniques beyond that which can be provided by manual assembly. Therefore, to improve this shortcoming, this paper proposes what is believed to be the world's first programmable ORGA architecture with no disassembly. Finally, the availability of this architecture is discussed based on the experimental results.