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A kind of watchdog circuit detection method and device

A technology of circuit detection and watchdog, which is applied in the field of microelectronics, can solve problems such as CPU and watchdog circuit failure, dangerous operation, etc., and achieve the effect of avoiding double failure

Active Publication Date: 2018-02-09
CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current CPU cannot realize the fault detection of the watchdog circuit, so that even if the watchdog circuit fails, the CPU still cannot know the information, resulting in double faults of the CPU and the watchdog circuit, resulting in dangerous operation

Method used

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  • A kind of watchdog circuit detection method and device
  • A kind of watchdog circuit detection method and device
  • A kind of watchdog circuit detection method and device

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0034] see figure 1 A schematic flowchart of an embodiment of a watchdog circuit detection method of the present invention is shown.

[0035] 101: Send a prefabricated dog feeding signal to the watchdog circuit.

[0036] It should be noted that in this embodiment, the prefabricated dog feeding signal can be a prefabricated normal dog feeding signal, a prefabricated abnormal dog feeding signal or a prefabricated empty dog ​​feeding signal, that is, to suspend ...

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Abstract

The application discloses a watchdog circuit detection method and device. The method judges whether the watchdog circuit is faulty by sending a prefabricated dog feeding signal to the watchdog and judging whether the feedback signal of the watchdog matches the expected feedback signal of the prefabricated dog feeding signal. Compared with the prior art, in the present invention, the watchdog circuit can realize the feedback to the prefabricated dog feeding signal, so the CPU can judge whether the watchdog is faulty according to the feedback signal, thereby realizing the detection of the watchdog fault, Avoid causing double failure of CPU and watchdog circuit, resulting in dangerous operation.

Description

technical field [0001] The present application relates to the field of microelectronics, and more specifically, to a method and device for detecting a watchdog circuit. Background technique [0002] Modern CPUs usually have built-in watchdog circuits that can restart the CPU if an unpredictable error occurs in the CPU. The process is that the CPU chip regularly feeds the dog to the watchdog circuit, and the watchdog circuit detects the driving cycle of the dog feeding signal to judge whether the timing mechanism of the CPU and the scheduling mechanism of the CPU are running correctly. When the CPU feeds the dog cycle error or stops feeding the dog, the watchdog circuit can detect the error in time and direct the circuit to the safe side, and directly reset the CPU. The current CPU cannot detect the failure of the watchdog circuit, so that even if the watchdog circuit fails, the CPU still cannot know the information, resulting in double failure of the CPU and the watchdog ci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/07
Inventor 孟庆尧黄彬彬谢俊红朱雳雄
Owner CRSC RESEARCH & DESIGN INSTITUTE GROUP CO LTD
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