Аннотация:
Traditional solutions in ensuring the functional safety of safetyrelated
systems and their digital components based on methods and means of
testing and on-line testing, as well as fault-tolerant structures, including majority
schemes using multi-version technologies to counter common cause failures
are considered. The limitation of these approaches by the logical checkability of
digital circuits in the structural, structurally functional, and dual-mode versions
is shown. Multi-version solutions are aimed at countering common cause failures,
including common control faults related to reset, synchronization signals
and other common signals that can block digital components and their checking
circuits in a state identified as working. However, faults in chains of common
signals can also be addressed to hidden faults, which remain a problem in
safety-related systems. The logical checkability of the circuits decreases from
structural to dual-mode and increases with the reduction of matrix structures.
The maximum reduction is achieved in bitwise pipelines. The successes of
green and FPGA technologies created the conditions for the development of online
testing methods based on an assessment of energy consumption. These
methods can significantly complement the logical checking. A method for
monitoring common signals by estimating consumption currents in circuits of
bitwise pipelines using the example of a shifting register is proposed. The results
of experimental confirmation of the effectiveness of the proposed method
is achieved.
