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<p><b>Abstract</b>—This paper presents the design of strongly fail-safe interfaces which transform binary signals, generated by a system with error detection capabilities and eventually with fault-tolerant capabilities, into fail-safe signals, that is to say, into signals which, in the presence of failures, will be either correct or safe. The strongly fail-safe property is achieved by means of concurrent checking techniques. The interest of these interfaces is that they can be implemented in VLSI, while the conventional fail-safe interfaces require using discrete components. A formal theory of fail-safe systems is developed to guide the implementation of the new solutions.</p>
Fail-safe circuits, totally fail-safe circuits, strongly fail-safe circuits, self-checking circuits, fail-safe comparators, fail-safe voters.

M. Nicolaidis, "Fail-Safe Interfaces for VLSI: Theoretical Foundations and Implementation," in IEEE Transactions on Computers, vol. 47, no. , pp. 62-77, 1998.
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