A receiving method and system for FPGA-based adaptive 429 data receiving rate

Abstract

The invention provides a receiving method based on FPGA-based adaptive 429 data receiving rate, comprising: S1, performing burr filtering on received 429+ end and - end data; S2, having and only at the + end and - end The data with a high level at one end starts timing, and buffers the received data, and ends timing and buffering at the same time when a jump occurs at the + end or - end, and obtains timing t1, and the data received within the time period of timing t1; S3, Start timing when the data receiving + terminal or - terminal jumps from high level to low level, and stop timing until + terminal or - terminal jumps from low level to high level to obtain timing t2; S4, combine timing t1 with Add the time t2 to get the time t3 required to receive one bit of 429 data; S5, extract the data of the length of t3 from the cached data to obtain one bit of 429 data; S6, repeat steps S1-S5 32 times, you can get the complete A 429 data. The invention can ensure that the 429 data sending rate of the sending device can be adaptively and correctly received when the sending rate changes.

Description

technical field [0001] The present invention relates to the communication field, in particular to an FPGA-based receiving method and system for adaptive 429 data receiving rate. Background technique [0002] The ARINC 429 bus protocol was proposed by the American Aviation Electronics Engineering Council (AEC for short) in July 1977 and was approved for use. Protocol standards specify the data information transmission requirements between avionics equipment and related systems. ARINC429 bus has simple structure, stable performance, strong anti-interference and high reliability. It adopts the modulation method of bipolar return-to-zero tri-state code, and the bit rate of the high-speed working rate is 100Kb / s (see figure 1 , each data bit lasts 10us), the bit rate of the low-speed working rate is 12.5Kb / s (12Kb / s~14.5Kb / s) (see figure 2 , each data bit lasts 80us), and its error range is within 1% of the bit rate of the selected content. [0003] The transmission method o...

AI Technical Summary

Problems solved by technology

[0005] 1) The sending rate of the sending device is not standard; the sending rate of the sending device is not standard (the standard sending rate is 100Kb / s or 12.5Kb / s), which may cause the received 429 data error;

[0006] 2) Aging of crystal oscillator: With the prolongation of use time, the sending device has crystal aging or clock drift, but the receiving rate of the receiving device is fixed, which may cause the received 429 data error;

[0007] 3) Troublesome debugging: When the sending rate of the sending device changes, the conventional method is to measure the sending rate of the current sending device with an oscilloscope and then modify the related program of the receiving device's receiving rate, which is slow and inefficient.

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