Real-time control method for asynchronous messages of 1553B bus

Abstract

The invention discloses a real-time control method for asynchronous messages of a 1553B bus. An IP core (intellectual property core) of hardware is used for realizing transmission control over the asynchronous messages of the 1553B bus, including transmission of non-periodic messages and zero clearing of a service request bit and a vector character of each RT (remote terminal), and the real-time response to a service request of each RT and timely zero clearing of a status bit and the vector character of each RT are ensured. Compared with a method for realizing asynchronous communication through an upper computer, the real-time control method has the advantages that the transmission of the non-periodic messages is realized through condition messages of a BC (bus controller), the condition messages are only executed in a very short time, the real-time transmission of the non-periodic messages can be realized, and the transmission time sequence of the non-periodic messages on the bus can be ensured. The service request bit of a status word and the vector character are realized through a hardware zero-clearing function of each RT, the real-time property is good, the service request bit and the vector character can be timely cleared, and repeated processing of the same service request of each RT is avoided. According to the control method, the whole process is controlled in the hardware, and the architecture design of a system can be simplified.

Description

technical field [0001] The invention belongs to the technical field of avionics, and in particular relates to a real-time control method of 1553B bus asynchronous messages. Background technique [0002] The 1553B bus is a time-division command / response multiplexed data bus, which is widely used in avionics because of its high reliability and real-time performance. Each bus can be connected with a bus controller (BC), several (no more than 31) remote terminals (RT) used to connect the subsystem and the data bus for data communication, and generally a bus monitor ( BM). Among them, BM is used to monitor the communication status of each node. [0003] BC, as the main control device, controls the communication on the bus. RT can only communicate data under the control of BC, and RT cannot initiate communication directly. If the RT asynchronous message needs to be processed, it will be realized by RT sending asynchronous service request method or BC timing query method. In th...

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Problems solved by technology

[0005] The purpose of the present invention is to solve in the process of asynchronous message processing, the prior art is controlled by the upper computer to send the sending of BC aperiodic message and the service request bit of RT status word and the clearing of vector word, can not guarantee the sending of aperiodic message Timing, poor real-time performance, RT requests cannot be cleared in time, complex system architecture design problems

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