基于basys2的四位有符号二进数除法

DE2-115开发板LED显示测试源码，对fpga开发者提供参考(DE2-115 development board LED display test source, provide a reference for fpga developer)

是codic算法实现atan的C程序，包括定点和浮点程序，已经通过验证。(Atan is codic algorithm of C procedures, including fixed-point and floating-point procedures, has been validated.)

说明：  数字钟通过verilog实现，并且支持Modelsim仿真，通过实验验证(The digital clock is implemented by Verilog and supports Modelsim simulation)

文章运用分级抽取和多相滤波的方法改进传统CIC滤波器的结构,降低了系统工作频率,运用幅度改进函数(ACF)和外加级联余弦预滤波器的技术改进了滤波器频率响应,提出了一种高效的算法结构,改善了通带损耗,增大了阻带衰减,对CIC滤波器的实际应用和深入研究有着现实意义。 (Article the use of hierarchical multi-phase extraction and filtering methods to improve the structure of the traditional CIC filter, reducing the system operating frequency, the use of margin to improve the function (ACF) and the cosine cascade plus pre-filter technology to improve the filter frequency response, the an efficient algorithm to improve the pass-band loss, increases the stopband attenuation of the CIC filter in practical applications and in-depth study has practical significance.)

HDLC控制器源码，包括单独HDLC的Tx端和Rx端实现，以及顶层带FIFO和Wishbone总线控制器的实现，通过Wishbone可方便与CPU连接，通过软件控制整个HDLC控制器的工作。

液晶的控制，有VHDL语言实现-lcd control

采用VHDL硬件描述语言实现的双口径RAM块存储器的初始化(VHDL hardware description language using the dual-caliber RAM block memory initialization)

一个简单的键盘接口模块程序，对键盘输入的数据和时钟信号进行过滤。过滤后的数据信号PS2Df将被送入两个11位移位寄存器中(A simple keyboard interface module program filters keyboard input data and clock signals. The filtered data signal PS2Df will be fed into two 11-bit displacement registers.)

these files are written in verilog but i am uploading in text format

FPGA做VGA通讯的详细资料，我找了很久才收集起的，很有用，可供初学者学习实用-FPGA to do VGA communication details, I am looking for a long time before starting the collection, very useful for beginners to learn practical