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mBnB码是光纤通信系统中常用的码型之一,本文介绍了一种简单实用的3B4B编码方法,并提出了用Altera开发系统的硬件描述语言VHDL实现全数字3B4B编译码电路的设计思想和方法,最后给出了波形仿真结果。在接收机中如何用全数字技术完成位同步信号提取是可研究的一个课题,本文给出了针对该编码方法的除数字锁相环之外的一种简单方便的VHDL语言设计方法。
This paper introduces a simple and practical method of 3B4B coding, and presents the design idea and method of implementing all-digital 3B4B coding and decoding circuit with the hardware description language VHDL of Altera development system Finally, the waveform simulation results are given. In the receiver how to use all-digital technology to complete the bit-synchronous signal extraction is a subject that can be studied, this article gives a simple and convenient VHDL language design method for the encoding method except digital phase-locked loop.