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Real-time communication and clock synchronization method of chain network

A technology of real-time communication and clock synchronization, applied in synchronization devices, data exchange networks, digital transmission systems, etc., to solve the problems of system communication failure, mutual interference, real-time and synchronization damage, etc.

Active Publication Date: 2014-07-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a reasonable real-time communication scheduling is not adopted, the above steps will interfere with each other, which will cause system communication failures and destroy real-time and synchronization.

Method used

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  • Real-time communication and clock synchronization method of chain network
  • Real-time communication and clock synchronization method of chain network
  • Real-time communication and clock synchronization method of chain network

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Embodiment Construction

[0045] Such as figure 1 As shown, in this embodiment, the Ethernet information transmission system includes 1 master device and n slave devices (n≥2). In this embodiment, it is assumed that there are 4 slave devices. The Ethernet information transmission system adopts a ring topology, and each device is connected by a twisted pair with a length of 3 meters. The clock of the master device is used as the clock source of the entire network system, and a clock counter with adjustable frequency can be built in each slave device.

[0046] In this embodiment, the user layer protocol of the Ethernet information transmission system is realized by DSP. The DSP adopts the TMS320F2812 chip of Texas Instruments Company. In addition to the chip's own flash storage area, the Ethernet information transmission system uses the expanded SRAM-IS61LV51216 as the data storage area for DSP operation. In this embodiment, FPGA is used as the data link layer of the system, and a clock counter with a...

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Abstract

The invention discloses a real-time communication and clock synchronization method for a chain network, comprising the following steps: A. The master device enumerates and configures each slave device, and enables the forwarding function of each slave device to form an Ethernet chain network structure ;B. Between the master device and the slave device, or between the slave devices, the delay request message and the delay response message are exchanged to obtain the relevant time stamp, and then calculate the line between the current device and the next slave device. Delay and store the line delay in the current device; C. The master device sends a message to correct the initial deviation signal, and each slave device completes the initial deviation correction of the local clock in turn after receiving the message to correct the initial deviation signal; D. Periodic real-time communication is carried out between the master device and each slave device in the form of aggregated frames, and the clock synchronization process is embedded in the real-time communication process. The method of the invention solves the real-time communication scheduling problem brought about by the combination of the two.

Description

technical field [0001] The invention relates to a real-time communication and clock synchronization method, in particular to a real-time communication and synchronization method based on a chain network of lumped frames and transparent clocks. Background technique [0002] Due to its good openness, wide application and low price, Ethernet has been increasingly used in industrial field communication. Compared with the traditional commercial Ethernet, the Ethernet information transmission system used in the industrial field requires higher real-time performance, and thus puts forward higher requirements for the system clock synchronization as the real-time basis of network information transmission. [0003] The clock synchronization of multiple nodes in the current Ethernet information transmission system generally adopts the IEEE 1588 protocol, and its basic function is to keep other clocks in the distributed network synchronized with the most accurate clock. A Precision Tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L12/70H04L47/27
Inventor 丁懋卿熊振华许雄吴建华丁汉
Owner SHANGHAI JIAO TONG UNIV
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