New device technologies developed in the Japanese national projecton super computer system

摘要

A national project on a superconducting system design is outlined.The project was launched in 1981 and finished in January, 1990. Thebasic concept of system construction is called PHI, standing for thefollowing key technologies: parallel processing for high-speedcomputing, hierarchical memory for high-speed and large-capacitystorage, and user-friendly interface. The objective performances forlogic LSIs were set at 30 ps/gate at room temperature and 10 ps/gate at77 K. For the memory LSIs, faster address access time than 10 ns with 16kbit complexity was targeted. Josephson junction device, GaAs MESFET,and HEMT technologies were developed to achieve the above performancegoals. For overall evaluation of basic technologies, two parallelprocessing systems were built. The first one, using 3 MESFETs and 4HEMTs, operates at more than 10-GFLOPS with 4 processors. The othersystem implementing 2 MESFETs and 1 HEMT, shows a special capacity forultra-high-speed data processing in satellite communicationsystems