SEU-tolerant QDI circuits [quasi delay-insensitive asynchronous circuits]

This paper addresses the issue of single-event upset (SEU) in quasi delay-insensitive (QDI) asynchronous circuits. We show that an SEU can cause abnormal computations in QDI circuits beside deadlock, and we propose a general method to make QDI circuits SEU-tolerant. We present simplified SEU-tolerant buffer implementations for CMOS technology. Finally, we present a case study of a one-bit comparator and show SPICE-simulation results.