512阶高速FIR成型滤波器，四相位复用，树形加法和多级流水线结构。-512-order high-speed FIR shaping filter, four-phase re-use, tree addition and multi-stage pipeline structure.

8*8乘法器 采用树形结构，如有不足之处请指正-8* 8 multiplier with tree structure, please correct me if inadequate