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SYNTHESIS OF BUILT-IN CONTROL CIRCUITS FOR COMBINATIONAL DIGITAL DEVICES BY THE METHOD OF SELF-DUAL COMPLEMENT TO THE BERGER CODE

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A new structure is presented for a self-checking combinational device with a built-in control circuit implemented according to self-dual complement method for summation codes. In contrast to the known ones, the proposed structure uses a summation code encoder, which makes it possible to reduce the number of controlled functions. The considered method is a development of the known control methods - self-dual parity and self-dual duplication. No malfunctions that distort the outputs of the encoder on direct and inverse combinations are found in the object of diagnostics. The probability of the existence of such faults is low, and therefore a sharp increase in the percentage of error coverage can be expected compared to using the parity code and, quite possibly, compared to duplication with self-dual complement. The use of the method makes it possible to synthesize simpler devices than with the duplication method, as well as to build completely self-checking devices, even in the case when this is impossible during duplication. It is possible to optimize indicators of the technical implementation of the built-in control scheme complexity by choosing the simplest blocks for calculating correcting functions from their entire variety.

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