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High availability watchdog circuit

A high-availability, watchdog technology, applied in the direction of electrical digital data processing, response error generation, instruments, etc., can solve the problems of short-term system out of control, system function loss, and repeated reset of faulty systems, so as to improve availability and improve Reliability, the effect of enhancing fault tolerance

Inactive Publication Date: 2016-06-15
XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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AI Technical Summary

Problems solved by technology

[0004] In the integrated avionics system, the hardware circuit and task processing adopt an integrated design. If the system is reset directly after the watchdog times out, it will cause the entire system to short-circuit due to sporadic software / hardware failures or non-critical failures. The phenomenon of time out of control reduces the reliability and availability of the system; moreover, if the fault source is not eliminated, the faulty system will be reset repeatedly, and the system will not work normally. Completely lost; Secondly, if the software site does not record the dog barking, it is impossible to analyze and locate the fault afterwards

Method used

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  • High availability watchdog circuit

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Embodiment Construction

[0043] see figure 1 , The operating principle of the high-availability watchdog circuit of the present invention: the watchdog control circuit is mainly composed of a watchdog counting circuit, a watchdog feeding dog circuit, a watchdog interrupt circuit, and a watchdog reset circuit. The main components of the watchdog circuit function as follows:

[0044] a) Watchdog counting circuit: mainly realizes the cycle counting of the watchdog and the timeout comparison with the watchdog timeout counter. It can be initialized to different watchdog counting periods and timeout periods according to different requirements; the input and output of the circuit are as follows:

[0045] 1) Reset signal: input, when the reset signal is valid, the watchdog counter is cleared, the watchdog timeout counter is preset, and the watchdog timeout signal outputs an invalid state;

[0046] 2) Watchdog counting clock: input, clock signal, every time a cycle passes, the watchdog counter increases by 1...

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Abstract

The present invention provides a high availability watchdog circuit. The high availability watchdog circuit comprises a watchdog counting circuit, a watchdog feed dog circuit, a watchdog interrupt circuit and a watchdog reset circuit which are successively connected; the watchdog counting circuit achieves watchdog period counting, and timeout comparison with a watchdog timeout counter, and initializes different watchdog counting periods and timeout periods according to different requirements; the watchdog feed dog circuit 'clears' a counter in the watchdog circuit through a reading / writing register; and the watchdog interrupt circuit comprises a watchdog interrupt control circuit and a watchdog interrupt counter. The high availability watchdog circuit is adapted to operating requirements of large-scale application software of an integrated avionics system, availability of the system is improved by enhancing fault-tolerant capability of the system, and system reset caused by accidental faults of system software / hardware is prevented.

Description

technical field [0001] The invention belongs to the field of embedded computer systems, in particular to a watchdog circuit with high availability. Background technique [0002] With the demand for the development of integrated and modular avionics systems for airborne systems, the requirements for the degree of integration and processing performance of the avionics core processing platform are getting higher and higher, and the integration of the integrated processing platform has led to the system application software. The direction of integration is developing. Therefore, the scale of system application software is getting larger and larger, task scheduling is becoming more and more complex, and the tasks of avionics systems are highly concentrated. How to improve the reliability, robustness, and availability of system application software has become an important issue we are currently facing. question. [0003] In the combined avionics system, in order to prevent the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/07
CPCG06F11/0757
Inventor 韩嫚莉沈华王明高杨魏婷刘婷婷
Owner XIAN AVIATION COMPUTING TECH RES INST OF AVIATION IND CORP OF CHINA
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