Abstract
Nowadays, FPGAs are used in many safety-critical applications. They are mainly subjected to Single Event Upsets (SEUs) that can flip the state of a memory cell, thereby forcing the circuit to produce an erroneous output. Fault-tolerant techniques are used to mitigate these errors. Triple Modular Redundancy (TMR) is one of the most commonly used fault-tolerant techniques in FPGAs. However, the voter is a single point of failure. This paper proposes a fault secure TMR voter design. This voter is analyzed according to its FPGA implementation. SEUs, Single Event Transients (SETs) as well as single stuck-at-0(1) faults are considered. In the presence of these faults, this voter will always produce the correct output or will give an indication of the presence of an error. Alternating Logic is utilized in the design to help with error detection while Dynamic Partial Reconfiguration (DPR) is used for error recovery.
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