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SYNTHESIS OF A BUILT-IN CONTROL CIRCUIT FOR MULTI-OUTPUT COMBINATIONAL DEVICES BASED ON LOGICAL COMPLEMENT AND SIGNAL COMPRESSION

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Some problems of constructing automation and computer technology devices with self-checking structures are discussed. The possibility of developing a modification of the well-known logical com-plement method for the purposes in question is considered. The essence of the method consists in ini-tial transformation of the source device operating functions into functions of a special type and subse-quent control of them according to selected diagnostic criteria. To implement the method, a logical complement block is used, formed by a cascade of two-input adders modulo two. An approach based on a hybrid method of organizing control is proposed: initially, the signals coming from several outputs of the source device are compressed, and then the compressed signals are controlled by the logical complement method. It is shown that the approach allows to reduce the final device structural redun-dancy by reducing the number of control sub-circuits. The effectiveness of the new approach as applied to organization of self-checking devices is confirmed by an example which demonstrate the possibility to build a device not only with a structural redundancy lower than with duplication, but also comparable and even less than with control by parity.

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