Highly reliable spaceborne memory subsystem
Abstract
Experience with low altitude earth orbiting semiconductor memories since 1976 indicates that the prevalent faults are single bit errors. These may be triggered by internal threshold shifts within the RAMs due to radiation, cosmic rays, or other causes. Recent advances in CMOS LSI technology have made it feasible to add error correction coding to spaceborne memories. A highly reliable, modular, main memory for an on-board processor has been developed. It employs static 4096X1 RAMs, modified Hamming (22,16) code and CMOS/SOS LSI technology. The design is optimized for spacecraft applications by providing telemetry about the error correction functions during prelaunch checkout and in orbit. In addition, the modules are structured to provide a high degree of isolation to protect against fault propagation.
- Publication:
-
Computers in Aerospace Conference
- Pub Date:
- 1981
- Bibcode:
- 1981coae.conf...66O
- Keywords:
-
- Airborne/Spaceborne Computers;
- Computer Storage Devices;
- Error Correcting Codes;
- Large Scale Integration;
- Random Access Memory;
- Semiconductor Devices;
- Cmos;
- Cosmic Rays;
- Insolation;
- Solar Radiation;
- Spacecraft Instruments;
- Threshold Logic;
- Spacecraft Instrumentation