An optically differential reconfigurable gate array with a holographic memory

Abstract

Optically Reconfigurable Gate Arrays (ORGAs) offer the possibility of providing a virtual gate count that is much larger than those of currently available VLSIs by exploiting the large storage capacity of holographic memory. We developed an Optically Differential Reconfigurable Gate Array (ODRGA-VLSI) with no overhead and fast reconfigu-ration capability. This paper presents the results of development of a perfect optical reconfigurable system with the ODRGA-VLSI chip and holographic memory. Experimental results of the reconfiguration procedure and circuit performance on a gate array are also presented.

A multi-context holographic memory recording system for Optically Reconfigurable Gate Arrays

“…However, our newly developed ORGA-VLSIs with a perfectly parallel programming capability [21]- [28] allow very-high-speed reconfiguration. In the ORGA-VLSIs, serial transfers were perfectly removed and optical reconfiguration circuits including static memory functions and photodiodes were placed near and directly connected to programming elements of a programmable gate array.…”

“…To address such situations, mixed optical and electrical VLSIs [10]- [28] have been developed. In particular, optically reconfigurable gate arrays (ORGAs) [18]- [20] were developed to realize both capabilities of rapid reconfiguration and numerous reconfiguration contexts.…”

“…We have developed new ORGA-VLSIs that have lessthan-10-ns reconfiguration capability without any overhead [21]- [28]. However, up to now, a multi-holographic reconfiguration system suitable for such no-overhead and rapidly reconfigurable ORGA-VLSIs has never been developed.…”

A lens-less imaging holographic memory writer system for a programmable optically reconfigurable gate array

“…To reprogram an ORGA, a holographic memory must be disassembled from its ORGA package and reprogrammed using a holographic memory writer. It must be then implemented onto the ORGA package with high precision beyond the capabilities of manual assembly [14], [15].…”

A Reconfiguration Speed Adjustment Technique for ORGAs with a Holographic Memory

“…The diffraction pattern from the holographic memory can be received as a reconfiguration context on a photodiode-array implemented in a programmable gate array of an ORGA-VLSI. Therefore, this architecture allows reconfiguration in nanoseconds, along with the use of numerous reconfiguration contexts [18]- [20], [27].…”