Fault Masking in Synchronous and in Asynchronous Logic
- A Comparison
978-620-2-22563-2
6202225637
96
2019-11-12
54,90 €
eng
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The topic of this book is the investigation of fault masking effects in synchronous and asynchronous logic.A fault is said to be masked if it affects a circuit but never creates an erroneous state and hence stays ineffective. In synchronous logicit is known that faults can be masked on three different levels: (1) Electrical masking: A fault is injected on the electrical level, but it doesn't affect the logical level. The current pulse induced is not large enough to change the boolean value. (2) Logical masking: The fault changes a boolean value but the logical function which is performed on this signal does not take it into account. For example if you look at an AND-Gate (2 inputs), a "`false"' logic 1 only propagates if the other input is also 1. This we call implicit logical masking. Explicit logical masking is related to majority voting with replicated functions. (3) Temporal (latching-window) masking: This level deals with the temporal behavior, the fault disturbs a signal but it isn't captured. For example a transient fault between two clock edges in a synchronous circuit has no effect on the storage element as long as its effect has vanished by the next clock event
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