Adders, Subtractors, and Multipliers - DE2-115

build synthesizer on a de2 dev fpga board

说明：  matlab代码，利用Farrow结构设计分数延时滤波器，滤波器阶数和个数可分别进行设置，利用最大最小准则近似。(Matlab code, using Farrow structure design fractional delay filter, filter order and number can be set separately, using the maximum and minimum criterion approximation.)

支持GF(2^n)域的rs编解码，可直接修改参数实现不同方式的RS编码和解码(This program is an encoder/decoder for Reed-Solomon codes.)

键盘扫描，实现4×4键盘扫描功能，实现在数码管上显示相应的数字-Keyboard scanning, the realization of 4 × 4 keyboard scan function, the realization of digital tube display in the corresponding figure

Leonardo综合器用STDL80 0.5um综合库，安装见说明，找到它真不容易。(STDL80 0.5um ASIC Library for Leonardo)

Once the FPGA is located, the rest of the mapping data for the other components can be determined dynamically its section mapping registers.

VHDL的寄存器读写参考，可自己根据要求重新修改，本示范只做参考用-Register read and write VHDL reference to their request to amend in accordance with, the reference model only

说明：  win10的xilinx usb驱动，较新版本(Xilinx USB driver for win10, newer version)

设计一个简单的自动售饮料机的逻辑电路。它的投币口每次只能投入一枚五角或一元的硬币。投入一元五角钱硬币后机器自动给出一杯饮料。投入两元（两枚一元）硬币后，在给出饮料的同时找出一枚五角的硬币。

这本书介绍了数字应用的底层电路设计的理论及实验程序，非常有用，是一本很好的工具书。(This book describes the application of the underlying digital circuit design theory and experimental procedures, very useful, is a good tool.)