An approach for designing self-checking logic using residue codes

It is generally agreed now that the major portion of faults in logic system are not of permanent nature. Current testing strategies are incapable of detecting nonpermanent faults. The characteristics of such faults requires that logic circuits be designed in a way so that if there is a fault in the circuit, its effect will be detected during the normal operation of the circuit, i.e. the circuits be self-checking. In this paper the authors propose two rules based on the mode 3 residue coding scheme for designing circuits for online error detection.<>