遥感相机中影响FPGA配置的因素分析

Analysis of factors affecting FPGA configuration in remote camera

FPGA器件在空间遥感相机中应用越来越广泛,基于SRAM的FPGA必须配备PROM芯片,用以存放FPGA的编程数据,每次上电都需要重新加载配置,但受各种因素的影响,程序加载配置并不是每次都能成功。阐述了有关FPGA的配置过程,分析了影响配置的各个因素,并提出相应的设计优化措施。出现配置失败的电路,经设计优化后未曾出现配置失败。作为航天任务,遥感相机中绝不应出现FPGA配置失败的状态,为了提高上电配置的可靠性,提出了监测多个I/O信号电路方案,利用可靠性高的反熔丝FPGA来监测需要配置的FPGA,经数千次加载试验,FPGA配置成功率为100%,该方案对遥感相机更好地应用FPGA具有一定的参考价值。

FPGA devices are more widely used in space remote sensing cameras. FPGA based on SRAM must be equipped with corresponding prom chips for storing FPGA programming data. The configuration is reloaded after power on. However, the configuration does not always succeed for it is easily affected by various factors. This paper describes FPGA configuration process, analyze the various factors affecting the configuration and make recommendations for design optimization. The Configuration circuits do not fail in hundreds of configuration tests after optimization.. As space missions, FPGA configuration failure in remote sensing camera should never occur, in order to improve the reliability of power-on configuration, this paper presents a number of IO signal monitoring strategies. The use of high reliability anti-fuse FPGA which monitor the FPGA needed to be configured, can guarantee FPGA configuration almost 100% success. It has significant reference value in application of remote sensing cameras.