Detection of improper cpu operation from lap time pulses and...

G - Physics – 06 – F

Patent

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G06F 11/30 (2006.01) G06F 11/00 (2006.01)

Patent

CA 2107263

In a CPU monitoring apparatus, a lap time pulse, which is generated by the CPU in response to successive executions of a program, is monitored and determined whether its duration is between maximum and minimum values, or longer than the maximum value or shorter than the minimum value, and a program execution alarm signal is generated when the duration is either determined to be longer than the maximum value or shorter than the minimum value. The apparatus further determines whether the CPU has successfully or unsuccessfully executed a predetermined number of significant steps when the CPU has repeatedly executed the program a predetermined number of times, and generates a step execution alarm signal if the CPU is determined as having unsuccessfully executed the predetermined number of significant steps.

Dans un appareil de surveillance à unité centrale, une impulsion de temps de passage produite par l'unité centrale en réponse à des exécutions successives d'un programme est surveillée pour déterminer si sa durée se trouve entre des valeurs maximale et minimale données, ou si elle est plus longue que la durée maximale ou plus courte que la durée minimale, et un signal d'alerte est engendré quand cette durée est plus longue que la durée maximale ou plus courte que la durée minimale. L'appareil de l'invention détermine de plus si l'unité centrale a exécuté avec succès ou non un certain nombre prédéterminé d'opérations importantes quand elle a exécuté le programme de façon répétée un certain nombre de fois prédéterminé, et produit un signal d'alerte d'exécution des opérations s'il a pu établir que l'unité centrale a exécuté sans succès le nombre prédéterminé d'opérations importantes.

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