用VDHL写的25阶对称FIR滤波器，在塞克隆3FPGA下验证没有问题（AD采样时钟50Mhz，这个对硬件设计有点要求），里面调用官方乘法器API，要节省资源可以采用CSD编码转换乘法器，可以减少一半以上的资源-VDHL written by a 25th order symmetric FIR filter in Seke Long 3FPGA under verify that no problem (AD sampling clock 50Mhz, this design is a bit of hardware requirements), which calls the multiplier official API, can be used to save resources CSD encoding conversion multiplier can be reduced by more than half of the resources