Improving the Robustness of a Softcore Processor against SEUs by Using TMR and Partial Reconfiguration
Charlotte, North Carolina, USA
May 2, 2010 to May 4, 2010
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/FCCM.2010.16
SRAM-based field programmable gate arrays (FPGAs) are vulnerable to a single event upset (SEU), which is induced by radiation effect. This paper presents a technique for ensuring reliable softcore processor implementation on SRAM-based FPGAs. Although an FPGA is susceptible to SEUs, these faults can be corrected as a result of its reconfigurability. We propose techniques for SEU mitigation and recovery of a softcore processor using triple modular redundancy (TMR) and partial reconfiguration (PR) with state synchronization. By carrying out an experiment, we confirm that a faulty softcore processor can be recovered and synchronized with other softcore processors. The proposed technique requires 4.315 times the resource usage and 62.491% of the operating frequency of the base processor. However, the proposed recovery process only takes 6 μs under TMR and PR. As a result of reliability estimation, the proposed system achieved about 2.713 times longer MTBF comparing with the previous system.
SEU, TMR, Partial Reconfiguration, Softcore Processor, ECC
Shiro Tanoue, Motoki Amagasaki, Yoshihiro Ichinomiya, Morihiro Kuga, Toshinori Sueyoshi, "Improving the Robustness of a Softcore Processor against SEUs by Using TMR and Partial Reconfiguration", FCCM, 2010, Field-Programmable Custom Computing Machines, Annual IEEE Symposium on, Field-Programmable Custom Computing Machines, Annual IEEE Symposium on 2010, pp. 47-54, doi:10.1109/FCCM.2010.16