Distributed network clock synchronizing system and method based on FPGA

Abstract

The invention requests to protect a small-size distributed network clock synchronization system based on a field programmable gate array (FPGA), which relates to the distributed network synchronization technique. The synchronization system comprises a PC, a HUB and a distributed unit based on the FPGA; each distributed unit is provided with a general network interface; the fixed synchronization cycle time proposal is adopted to realize the clock synchronization of the small-size distributed network, enabling the system to reach the microsecond grade synchronization. The synchronization mode adopted in the small-size distributed network clock synchronization system is similar to the mode of the IEEE1588 standards; based on the high accuracy synchronization property of the IEEE1588 standards, the initial synchronization speed of the synchronization system is improved so that a distributed system which has the advantages of high initial synchronization speed and high accuracy clock synchronization is realized. The network clock synchronization system provides each composite unit of the distributed network system with synchronization clock used as the reference of the working clock of the system; thereby, the small-size distributed network clock synchronization system is applicable to the distributed network which has high real-time requirement for data transmission.

Description

technical field [0001] The invention relates to computer control technology, in particular to distributed network synchronization technology. Background technique [0002] With the development of computer networks, the scope of distributed systems has expanded and become more dispersed, and the real-time performance between distributed control nodes connected through the network has become more and more important. The main root that affects the real-time performance of the distributed system is the clock difference between the various measurement and control devices and the transmission delay and jitter of the measurement and control data in the network. These problems are inherent in distributed systems. The key to solving these problems is time synchronization. The purpose of time synchronization is to accurately transmit the time reference point to each control point of the network. At present, the popular synchronization methods at home and abroad include: simple time s...

AI Technical Summary

Problems solved by technology

Moreover, when a new unit is added to the network or the network environment changes, the network needs to be resynchronized, and it takes a long time to complete the synchronization

In a 2-unit system, 10 line delays are required to complete a synchronization, and as the number of synchronization units increases, the time to complete the synchronization will increase exponentially

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