Input and output encoding techniques for on-line error detection in combinational logic circuits

Author(s):  
F.Y. Busaba ◽  
P.K. Lala
Author(s):  
Valeriy Sapozhnikov ◽  
Vladimir Sapozhnikov ◽  
Dmitriy Efanov ◽  
Ruslan Abdullaev

Objective: To study the specificities of polynomial codes application during the organization of concurrent error detection systems for combinational logic circuits of automation and computer engineering. Methods: The methods of information theory and coding, the theory of discrete devices and diagnostic engineering of discrete systems were applied. Results: The possibilities of using polynomial codes in the process of combinational logic circuits control organization were analyzed. Some essential properties, inherent in generator polynomials, which make it possible to synthesize self-checking circuits of concurrent error detection systems, were pointed out. Particularly, one of such essential properties is the presence of a constant term in a generator polynomial (otherwise, all the required test patterns are not generated for a complete check of a coding device). An example of concurrent error detection sys- tem implementation for a combinational circuit was given. Some experimental data on error detection in LGSynth’89 combinational benchmarks were described. Practical importance: The use of polynomial codes for combinational circuit control makes it possible to synthesize self-checking discrete devices of automation and computer engineering.


2020 ◽  
Vol 6 (4) ◽  
pp. 532-549
Author(s):  
V. V. Sapozhnikov ◽  
◽  
Vl. V. Sapozhnikov ◽  
D. V. Efanov ◽  
◽  
...  

The authors of the article found that in the use of classical sum codes (Berger codes) and a some of their modifications in the combinational circuits testing organization it is possible to detect both unidirectional and part of non-unidirectional errors in the data vectors. It is shown that it is possible to search for such groups of outputs of combinational circuits where only symmetrical errors occur due to stuck at-faults of elements of the internal structure of the circuits. Such groups of outputs are designated as symmetrically-independent outputs (SI-groups of outputs). The conditions of belonging of the group of outputs of the combinational circuits to the SI-groups of outputs are determined. It is shown that each SI-group of outputs can be controlled using a separate testing subsystem based on the code with the detection of any non-symmetrical errors (in particular, and any non-symmetrical errors up to certain multiplicities). The ways of searching for SI-groups of outputs in the combinational circuits testing organization are presented


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