Unidirectional/asymmetric error codes have extensively beenstudied, not only from theoretical interest but from application tocomputer systems or communication systems. Recently, attention has beenfocused on detecting only d, not all, unidirectional errors, that is, dbits unidirectional error detecting (d-UED) codes. The paper shows adesign method for a cost-effective self-testing checker for the optimald-UED code. The checking policy is to check whether condition of theBorden code satisfies or not. The proposed checker includes the parallelweight counter, the comparator and the modulo adder in which new residueoperation is defined and hence this makes the circuit self-testing.These circuits are designed to have all possible input patterns in orderto satisfy self-testing property. Finally, the proposed checker hasgreatly reduced hardware requirements
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