FAULT-TOLERANT ASIC: DESIGN AND IMPLEMENTATION

The paper presents fault-tolerant CMOS ASICs which are immune to the single event upsets (SEU), the single event transients (SET), and the single event latchup (SEL). Triple and double modular redundant (TMR and DMR) circuits and SEL protection switches (SPS) make the base for a modified fault-tolerant ASIC design flow. The proposed design flow requires the standard design automation tools and a few additional steps during logic synthesis and layout generation. An extra step is necessary to generate the redundant design net-list including voters. Other two extra steps (definition of the redundant power domains and placement of the SPS) have to be performed in the layout phase. The concept has been proven by design and implementation of the two digital circuits: shift-register and synchronous counter.