Bus device and method adopting synchronous mode switching and frame priority automatic adjustment

Abstract

The invention discloses a bus device and a method by adopting synchronous mode switching and automatic adjustment of frame priority. The device comprises a central clock management node and a plurality of communication nodes which are interconnected together through an instrument bus. A frame transmission working mode comprises the steps of firstly conducting bus arbitration by adopting a synchronous serial communication method in a central clock mode, then automatically switching to a source clock mode and finally realizing high-speed data transmission by adopting a synchronous parallel communication method. The scrabbling for bus arbitration is conducted by adopting a bit-by-bit competition method of an arbitration frame header, the arbitration frame header contains a priority adjustment field, a bus protocol realizes the automatic adjustment of the frame priority by changing the value of the priority adjustment field, and the real-time performance of bus communication can be effectively improved. The bus device provided by the invention has the advantages that the data transmission speed is high, the real-time performance is strong, the structure is simple, and the nodes on the bus are supported to conduct multi-host communication and form a bus topological structure network.

Description

technical field [0001] The invention relates to the communication field, in particular to an instrument bus used for multi-master high-speed communication between internal modules of micro-miniature instruments. Background technique [0002] In recent decades, my country has made rapid progress in the field of aerospace, and the electronic equipment in carriers such as bombs, arrows, and satellites has continued to increase. However, the requirements for the miniaturization of carriers are becoming more and more stringent. To reduce the structure and weight of the carrier, improve the reliability of the system, and effectively integrate the electronic devices in the carrier, an effective solution is to use a data bus structure. [0003] However, the currently widely used standard instrument bus hardware interfaces and protocols are relatively complex, and are not suitable for direct application to miniaturized instrument systems as a communication bridge for internal devices...

AI Technical Summary

Problems solved by technology

However, because the CAN bus adopts asynchronous communication mode, its communication rate is limited, and the baud rate is only about 1Mbps, and the data frame of the CAN bus can transmit up to 8 bytes of valid data at a time, which cannot meet the needs of large data between multiple devices. design requirements for high-speed communications

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