HDB3码因具有无直流成分,低频成分少和连0的个数不超过三个等明显优点而成为数字基带通信中最常用的码型。同时,由于硬件描述语言VHDL可读性强,可移植性强,支持对大规模设计的分解和对己已有设计的再利用等强大功能。现在已经在通信电路设计上得到广泛应用,文中结合HDB3的编码规则,给出了一种使用VHDL语言实现HDB3编码的思路和方法。 HDB3 code has become the most commonly used pattern in digital baseband communication due to its obvious advantages of no DC component, low low-frequency components and no more than three in number. At the same time, due to its strong readability and portability, the hardware description language VHDL supports powerful functions such as decomposition of large-scale designs and re-use of existing designs. Now it has been widely used in the design of communication circuits. In this paper, a combination of HDB3 encoding rules and a way to realize HDB3 encoding using VHDL language is given.