Validation of hardware error recovery mechanisms for the SPARC64 V microprocessor

The SPARC64 V microprocessor is designed for use in high-reliability, large-scale unix servers. In addition to implementing ECC for large SRAM arrays, the SPARC64 V microprocessor incorporates error detection and recovery mechanisms for processor logic circuits and smaller SRAM arrays. The effectiveness of these error recovery mechanisms was validated via accelerated neutron testing of Fujitsupsilas commercial unix server, the PRIMEPOWER 650. Soft errors generated in SRAM arrays were completely recovered by the implemented hardware mechanisms, and only 6.4% of the estimated neutron-induced logic circuit faults manifested as errors, 76% of which were recovered by hardware. From these tests, the soft error failure rate of the SPARC64 V microprocessor due to atmospheric neutron hits was confirmed to be well below 10 FIT.