Conditions for Detecting Errors in the Concurrent Checking Circuits by Boolean Complement Method to the Code "2-out of-5"

When synthesizing concurrent error-detection circuit using the signal’s Boolean correction method, it is needed to drop the masking of errors at the checker inputs – the system "last watch-dog". This task appears since for the signal’s correction from the diagnosis object, the distortion type may change. This causes the codeword of the given code to be set at the checker inputs. The authors consider the finding conditions problem for the undetectable error’s absence at the checker inputs when checking calculations by the signal’s Boolean correction method using the constant-weight code "2-out-of-5". The checker of this code detects any errors at the inputs, except for those errors that distort the same number of off-bits and on-bits – symmetrical errors. A condition is formulated, following which allows to fix in practice the facts of the symmetrical error’s potential formation at the checker inputs and use circuit techniques to parry them. The results obtained by can be generalized to the case of using arbitrary constant-weight code for organizing concurrent error-detection circuit using the signal’s Boolean correction method.