Multi-clock automatic switching method

Abstract

The invention relates to a multi-clock automatic switching method, comprising the following steps: monitoring whether a main clock has an error or not; judging whether the working frequency of a backup clock is normal or not; monitoring whether the main clock is lost; judging whether the backup clock is lost or not through the main clock; determining whether the clock is switched or not: countingmaster clock detection errors according to a configuration register counter value, and if the count value reaches the configuration register value and the master clock has errors, needing to be switched; if the master clock has a clock error and the backup clock is normal and switching conditions are met, determining the backup clock which is correspondingly switched according to the priority of the backup clock of the configuration register; and if the backup clock needing to be switched also has an error, switching to the clock with the secondary priority according to the priority of the backup clock of the register.

Description

technical field [0001] The invention relates to the field of aerospace communication, in particular to a multi-clock automatic switching method. Background technique [0002] In the fields of military communication and aerospace, the requirements for system stability, data fault tolerance and real-time performance are relatively high, so the clock of the system must be sufficiently stable. The system is generally designed to reserve several backup clocks with the same frequency as the main clock, so that when the main clock fails, it can be switched to the backup clock in time. [0003] In view of the above application background, how to monitor the problem of the clock or the loss of the clock, when and how to switch when the problem occurs, is a technical difficulty, and it is also a problem to be solved in this paper. The existing clock switching technology mainly adopts switching methods such as clock logic interlocking debounce technology, clock logic operation and con...

AI Technical Summary

Problems solved by technology

Disadvantages of this method: 1. If the clocks are of the same frequency, the falling edge cannot be collected directly; 2. It is impossible to judge whether there is a problem with the main clock frequency; 3. The state of the clock cannot be monitored in real time, and a software program is required to control the switching of the clock , is a passive behavior and its effectiveness cannot be guaranteed

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