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SYNTHESIS OF SELF-TESTABLE COMBINATIONAL DEVICES WITH CONTROL OF CALCULATIONS BY TWO DIAGNOSTIC PARAMETERS

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The structure of the organization of integrated control circuits for logic devices of automation and computer technology based on the use of two diagnostic parameters (hybrid structure) is proposed. As the first diagnostic parameter, belonging of the controlled functions in the circuit to a pre-selected redundant code is taken, and as the second diagnostic parameter, the affiliation of each function to a class of self-dual functions is considered. A detailed description of the hybrid structure of the organization of the integrated control circuit is given. Special cases of its implementation are considered — the use of "2 out of 4" constant-weight code codes and standard compression modules for two-rail signals. The possibilities of using specialized circuits for pre-compression of signals from the outputs of the diagnostic object necessary to reduce structural redundancy during the synthesis of the integrated control circuit are demonstrated. An example of the implementation of the integrated control circuit scheme for a hybrid structure is given. The algorithm of step-by-step determination of the functions of the control logic block is considered, taking into account the features of the implementation of a fully self-checking digital device.

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