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This paper presents a simple corrective control scheme for overcoming state transition faults occurring in the operation of asynchronous sequential circuits. The proposed controller is static, as it does not need any memory in its design so as to minimize the controller size. We address the existence condition and design procedures for static corrective controllers that invalidate state transition...
Reachability and state recovery for switched asynchronous sequential machines are investigated in this paper. The considered switched asynchronous machine is exposed to the adverse effect of adversarial inputs. The main objective is to design a state feedback controller so that the switched machine can recover the original state after going through unauthorized state transitions by faults. We propose...
We address fault diagnosis and tolerance in dynamics of asynchronous sequential machines based on corrective control theory. The controlled asynchronous machine has input/state type where the present state is given as the output value. We consider a kind of intermittent faults that cause unauthorized state transitions to the machine, and that persist for finite time after the initial occurrence. Not...
Corrective control compensates the stable state specification of an asynchronous sequential machine so that the closed-loop system can imitate the behavior of a reference model. In this paper, we present a novel scheme of controlling two asynchronous sequential machines with one corrective controller. By virtue of structural characteristics of corrective controllers, we can combine two controllers...
This paper addresses a feedback control methodology for asynchronous sequential machines. The control objective is model matching, namely designing a controller that compensates the closed-loop system so that it can match the behavior of a reference model. In particular, we propose a one-step corrective controller, which undergoes a minimum number of state transitions when operating the correction...
Model matching for an asynchronous sequential machine is to design a feedback controller that compensates the closed-loop system so that it can match the behavior of a reference model. The objective of this paper is to address the model matching problem for a composite asynchronous sequential machine. Two input/state asynchronous machines in cascade connection form a composite machine, where the output...
This paper presents a scheme of correcting transient faults in finite state machines with asynchronous mechanism. The considered system is cascade composition of two finite state machines and is exposed to transient faults that cause unauthorized state transitions. Using the theory of corrective control for asynchronous sequential machines, the proposed framework yields an output feedback controller...
Corrective control can compensate the stable-state behavior of asynchronous sequential machines without involving redesign of the inner logic of the machine. In this paper, we apply the corrective control scheme to a space-borne dual ring counter subject to Single Event Upset (SEU) faults. By virtue of hardware redundancy lying in the dual ring counter, we design a corrective controller that tolerates...
Feedback controllers that automatically counteract the effects of adversarial interventions on the operation of asynchronous sequential machines are considered. Bursts - fast outbursts of characters generated by the controlled machine during transitions - are employed to broaden the conditions under which such controllers exist. Included are necessary and sufficient conditions for the existence of...
In this paper, a control mechanism is proposed for state fault-tolerance of asynchronous sequential machines. A disturbance input may penetrate into the asynchronous machine and provoke unauthorized state transitions. The considered asynchronous machine is of input/output type, where access to the state of the machine is not available. The objective is to design output feedback controllers that automatically...
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