Manchester code decoding method based on FPGA and IEC60044-8 standards

Abstract

The invention provides a Manchester code decoding method based on FPGA and IEC60044-8 standards. The Manchester code decoding method comprises the following steps: S1, filtering a Manchester code signal; S2, generating a receiving clock which is used for detecting a level signal in a Manchester code, wherein the frequency of the receiving clock is twice that of an encoding clock; S3, aligning thefalling edge of the receiving clock with the level falling edge of the Manchester code; S4, detecting a frame header by adopting the receiving clock; S5, generating a decoding clock with the same frequency as the encoding clock; S6, decoding, namely sampling the Manchester code detected by the receiving clock by adopting the decoding clock to obtain bit information of the Manchester code. According to the method, the problems that in the prior art, Manchester code decoding is too high in clock requirement and complex in decoding logic are well solved.

Description

technical field [0001] The invention belongs to the technical field of power system equipment communication, and in particular relates to a Manchester code decoding method based on FPGA and IEC60044-8 standard. Background technique [0002] Manchester encoding is a self-synchronizing encoding method, that is, the clock synchronization signal is hidden in the data waveform. The principle of Manchester encoding level transition is: at the middle moment of the clock signal, a falling edge transition indicates 0, and a rising edge transition indicates 1. This can prevent the loss of clock synchronization, or problems such as data reception errors caused by clock and data transmission out of synchronization. But each symbol is modulated to two levels, so the data transmission rate is only half of the modulation rate. [0003] When decoding, it is necessary to separate the clock and data signals in the Manchester code from the received signal. Generally, by oversampling, it is r...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of Manchester decoding method based on FPGA and IEC60044-8 standard, to solve the Manchester decoding existing in the prior art to the problem that the clock is too high and the decoding logic is relatively complicated

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