A Method for Realizing Double Redundancy of Crystal Oscillator in Flight Control Computer

Abstract

The invention provides a method for achieving crystal oscillator dual redundancy in a flight control computer. The flight control computer comprises two crystal oscillators, an FPGA and a DSP. The method includes the steps that a dual-crystal-oscillator clock is sent to the FPGA, and the frequency of the dual-crystal-oscillator clock is detected through an FPGA crystal oscillator clock mutual-detection module, the two crystal oscillators supply clock signals for the DSP and the FPGA respectively if both the two crystal oscillators normally work, when oscillation stop occurs to either one of the crystal oscillators, a clock switching module is started, the other crystal oscillator simultaneously supplies clock signals for the DSP and the FPGA, and meanwhile a reset module is started to supply reset signals for the DSP and the FPGA. The mutual detection conducted for finding out whether oscillation stop occurs to the dual-crystal-oscillator clock or not is achieved. When oscillation stop occurs to either one of the crystal oscillators, the other single crystal oscillator simultaneously supplies the reliable clock signals for the DSP and the FPGA through the clock switching module, and reliability of using the clock of the flight control computer can be effectively improved through the whole crystal oscillator dual redundancy design method.

Description

technical field [0001] The invention relates to a method for realizing double redundancy of crystal oscillators in a flight control computer, which is suitable for the high reliability design field of the flight control computer clock based on DSP and FPGA architecture. Background technique [0002] With the continuous development of national defense information processing technology, a large number of flight control computers currently adopt the embedded architecture of DSP+FPGA, and both DSP and FPGA need to introduce a crystal oscillator clock. The crystal oscillator is one of the three key devices (DSP, FPGA and crystal oscillator) on the flight control computer, and it is also the "heartbeat" generator of each board. There are two main ways to use the current crystal oscillator (specifically referring to the active crystal oscillator): one is to use two crystal oscillators and send them to DSP and FPGA respectively. The second is to use a crystal oscillator, driven by ...

AI Technical Summary

Problems solved by technology

[0003] The above two crystal oscillator access methods have a common fatal flaw: if any crystal oscillator stops vibrating, the DSP or FPGA will stop working, and then the flight control computer composed of DSP+FPGA architecture will be unusable, and the crystal oscillator stops vibrating. It is the main failure mode of the crystal oscillator (the failure rate is as high as 80%), so the above two access methods of the crystal oscillator greatly reduce the reliability of the flight control computer clock.

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