龙芯X微处理器抗辐照加固设计
摘要
Loongson X-CPU is a highly integrated, high-performance 32-bit MIPS SOC based on the Loongson LS232 architecture. The chip operates at 100 MHz and contains a CPU, an EMI, separate instruction sets and data caches, an interrupt controller, a general-purpose I/O interface, two UARTs, a PCI interface, and a flexible memory controller. Through radiation hardening by design (RDHB) for multiple aspects, including circular-shape gate layout, guard-ring protect, time and space triple modular redundancy, dual interlocked storage cell, and error detection and correction coding, the chip can adapt to complex space environments and complicated application requirements. The chip was tested for up to a total dose of 300 krad (Si) and it yielded an SEU error rate better than 1.90362×10<sup>-5</sup> /device/day.