Исследование свойств отказоустойчивой структуры комбинационного устройства, реализованной по методу логической коррекции сигналов с контролем вычислений по модифицированным кодам Хэмминга

Abstract

A fault-tolerant structure for combinational-type automation devices is considered, which does not imply the introduction of modular precision into the structure of the original device. In the fault-tolerant structure, using the method of logical correction of signals, a special block for fixing distorted signals is synthesized, and using a modified Hamming code, a concurrent error-detection circuit for the source object is synthesized. Correction is carried out using the output signal correction unit controlled by the concurrent error-detection control circuit and block for fixing distorted signals. This allows us to correct errors at any outputs of the source device, which are fixed by the concurrent error-detection circuit. Compared to parity codes used to control calculations testing, Hamming codes have improved detecting ability, which reduces the probability of error masking. An example is given demonstrating the process of modeling the operation of the fault-tolerant structure in case of occurrence of single stuck-at faults in it. The proposed method for synthesis of a fault-tolerant device could be used in implementation of automation and computer technology devices.