System monitoring device based on CPLD

Abstract

The invention provides a system monitoring device based on a CPLD (Complex Programmable Logic Device). The system monitoring device comprises a power-on time sequence control module, a sensor monitoring module, a system operation monitoring module and an alarm processing module, the power-on time sequence control module is used for monitoring all power supply chips of the tested system; the sensor monitoring module is used for monitoring the working current and the working temperature of the tested system, and when the working current or the working temperature is abnormal, the alarm processing module is notified to turn off the system power supply; and the system operation monitoring module is used for monitoring the operation state of the tested system and informing the alarm processing module to perform soft reset operation or power-off restart operation on the tested system or turn off the system power supply if the system is abnormal. According to the invention, the tested system is monitored based on the CPLD, so that the monitored system can be automatically recovered when a software fault occurs, and can be timely powered off when a hardware fault occurs.

Description

technical field [0001] The present invention relates to the field of system monitoring, and more particularly, to a system monitoring device based on CPLD. Background technique [0002] At present, the application of processors is becoming more and more complex, which also brings many challenges. How to ensure that the system can run stably in different working environments is a major difficulty. Among them, the monitoring system plays an increasingly important role. like figure 1 As shown in the figure, the traditional system monitoring method is generally implemented by an external watchdog. The GPIO (General Purpose Input Output, general input / output port) derived from the processor continuously sends a dog feeding signal to the WDI pin of the watchdog chip. When the device fails, the processor stops feeding the dog, thereby triggering the watchdog chip to restart the system. However, there are many defects in this method. Sometimes the power-on sequence is chaotic due t...

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Problems solved by technology

[0002] At present, the application of processors is becoming more and more complex, which brings many challenges. How to ensure the stable operation of the system in different working environments is a major difficulty. Among them, the monitoring system plays an increasingly important role. like figure 1 As shown, the traditional system monitoring method is generally implemented by using an external watchdog, and the GPIO (General Purpose Input Output, general purpose input / output port) derived from the processor continuously sends a feeding signal to the WDI pin of the watchdog chip, When the device fails, the processor stops feeding the dog, which triggers the watchdog chip to restart the system. However, this method has many defects. Sometimes the power-on sequence is disordered due to external strong electromagnetic interference during the power-on process of the device, resulting in The processor cannot be started. At this time, the external watchdog has not started to work, and the processor cannot be reset, which will cause the device to crash. In addition, if the device has a hardware failure, no matter how the external watchdog restarts the system, the device cannot be reset. Return to normal, and there is no corresponding measure to quickly power off the equipment and inform the equipment maintenance personnel of the fault information in time

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