基于CPLD_FPGA的数字通信系统建模与设计，本学习资料共分为4个部分，此为第一部分，供对数字通信系统建模和设计有兴趣的朋友学习参考。-CPLD_FPGA based on the digital communication system modeling and design, the learning materials is divided into four parts, this is the first part of t