Single Event Upsets Under 14-MeV Neutrons in a 28-nm SRAM-Based FPGA in Static Mode

A sensitivity characterization of a Xilinx Artix-7 field programmable gate array (FPGA) against 14.2-MeV neutrons is presented. The content of the internal static random access memories (SRAMs) and flip-flops was downloaded in a PC and compared with a golden version of it. Flipped cells were identified and classified as cells of the configuration RAM, block RAM (BRAM), or flip-flops. Single bit upsets (SBUs) and multiple cell upsets (MCUs) with multiplicities ranging from 2 to 8 were identified using a statistical method. Possible shapes of multiple events are also investigated, showing a trend to follow wordlines. Finally, MUlti-Scales Single Event Phenomena Predictive Platform (MUSCA SEP3) was used to make assessment of actual environments and an improvement of single event upset (SEU) injection test is proposed.