两路单极性HDB3+和HDB3-信号，经映射模块后完成单极性到双极性信号的数字转化，该模块由设计文件ys.v完成。由于映射后得到的是双极性归零码，通过该模块得到双极性非归零码。该模块由设计文件delay.v完成-Two unipolar HDB3-signals HDB3+, and by the mapping module to complete unipolar to bipolar signal digital conversion, the module completed by th