三级级联梳状滤波器（CIC）的verilog实现。顶层模块top_moduole下面包含三个子模块，积分模块integrated，抽取模块decimate和梳状滤波器模块comb，已验证可综合通过并实现CIC功能-Three-level cascade comb filter (CIC) verilog implementation.Top-level module top_moduole below contains three child module, integral module in