基于XC7V690T的在轨抗单粒子翻转系统设计

System Design of On-orbit Anti-SEU Based on XC7V690T

摘要:

针对核心工业级SRAM型FPGA芯片XC7V690T抗辐照能力较弱、在轨运行期间存在较高单粒子翻转风险的问题，为了提高XC7V690T在轨抗单粒子翻转的能力及配置文件注数修改的灵活性，设计了一种基于XC7V690T的在轨抗单粒子翻转系统架构。其硬件架构主要由XC7V690T SRAM型FPGA芯片、AX500反熔丝型FPGA芯片以及多片FLASH组成；软件架构主要包括AX500反熔丝型FPGA对XC7V690T进行配置管理及监控管理，对XC7V690T进行在轨重构管理，XC7V690T通过调用内部SEM IP核实现对配置RAM资源的自主监控和维护。在轨实验结果表明，采用工业级SRAM型FPGA芯片XC7V690T的某航天器通信机在轨测试过程中成功进行了SEM纠错，通信机在轨工作正常，通信链路稳定，满足使用要求，表明该系统架构可以有效提升XC7V690T抗单粒子翻转能力，可以为其他SRAM型FPGA抗单粒子翻转设计提供借鉴与参考。

Abstract:

Aiming at the problem that the core industrial SRAM-based FPGA chip XC7V690T has weak anti-irradiation capability and risk of single-event upsets(SEU) during the periods of on-orbit operation, in order to improve the on-orbit anti-SEU capability of industrial SRAM-based FPGA chip XC7V690T and the flexibility of configuration file for modification, an on-orbit anti-SEU system architecture based on XC7V690T is designed. The hardware architecture is mainly composed of XC7V690T SRAM-based FPGA chip, AX500 anti-fuse FPGA chip and multiple FLASH chips. The software architecture mainly includes XC7V690T configuration management and monitoring management by AX500 anti-fuse FPGA, on-orbit reconstruction management of XC7V690T, and invoking the internal Soft Error Mitigation (SEM) IP core to realize the independent monitoring and maintenance of configuration RAM resources of XC7V690T. On-orbit verification results show that the SEM error correction of a spacecraft communicator based on industrial SRAM-based FPGA chip is carried out successfully during the periods of on-orbit operation, and the spacecraft communicator using this scheme works stably during the periods of on-orbit operation. It provides a stable communication link and meets the application requirements. The architecture can effectively improve the anti-SEU capability of XC7V690T, which can provide reference of anti-SEU design for other SRAM-based FPGA.