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vol 63 / September, 2020
Article

DOI 10.17586/0021-3454-2016-59-7-524-533

UDC 681.518.5:004.052.32

METHOD OF OPERATION CONTROL OVER COMBINATORY LOGIC DEVICE BASED ON 2-OUT-OF-4 CODE

V. V. Sapozhnikov
PSTU; Professor, Department of Automation and Telemechanics on the Railways


V. V. Sapozhnikov
PSTU; Professor, Department of Automation and Telemechanics on the Railways


D. V. Ephanov
PSTU; Department of Automation and Telemechanics on the Railways


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Abstract. A new method of operational control system design is developed. The method allows diminishing the system redundancy index as compared with the known approaches. The solution is obtained due to application of balanced codes in creation of operation control system. The proposed structural diagram of the control system realizes the principle of logical complement of Boolean functions based on the use of 2-out-of-4 code. Special features to be taken into account in design of the structure of an operation control system on the base of 1-out-of-4 or 2-out-of-4 codes providing the total self-checking are considered. Advantages of the use of 2-out-of-4 code over 1-out-of-4 code for combinatory logic device control system are demonstrated. In particular, provision of total self-checking of the operation control system on the base of 2-out-of-4 code requires less stringent restrictions than in the case when 1-out-of-4 code is applied.
Keywords: concurrent error detection, logical complement, 1-out-of-4 code, 2-out-of-4 code, totally self-checking structure, testing

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