基于VHDL语言编写的FFT程序，256点，旋转因子存在自己编写的ROM里面，乘法器和数据存储采用的是IP核-FFT-based program written in VHDL, 256 points, there is rotation factor which I have written the ROM, multiplier, and data storage is used in IP core

quartus ii 中利用ip核生成fft模块，实现256点fft功能-quartus ii the use of nuclear generation fft ip module to achieve the 256 point fft function