数字钟的实现 FPGA上运行 VHDL编写

fpga实现ddr数据收发测试，完整的工程，下载解压后，即可正确运行，已多次验证无误(FPGA DDR data receive and receive test, complete engineering, download and unzip, can run correctly, has been verified many times)

clock for spartan 3 evaluatoin board

pc104接口的verilog代码，仅供参考-pc104 verilog interface code for reference purposes only

说明：  一个走马灯的程序,可以按照要求一个一个往后面按顺序点亮(A program for the lantern can be lit one by one according to the requirements.)

在接收信号的数字化、软化的实现中,数字下变频起着重要的作用。本文首先介绍了数字下 变频的组成结构,然后详细分析了数字下变频的工作原理,描述了在实现数字下变频时,设计方案所 采用的高效滤波器———CIC 滤波器和多相抽取滤波器的结构和原理。最后,用通过Simulink 对数字 下变频的性能进行了仿真。在仿真的基础上使用Insight 公司的FPGA 开发系统,用测试电路实测了 数字下变频的性(In the receiving digital signal, softening the realization, the digital down-conversion plays an important role. This article first introduced the digital down conversion of the composition, and then a detailed analysis of digital down conversion of the working principle described in the realization of digital down conversion, the design used in high-performance filters--- CIC filters and multi-phase extraction filter structure and principle. Finally, with the adoption of Simulink for digital down-conversion performance of the simulation. In the simulation based on the use of Insight s FPGA development system is measured using the test circuit of the digital down-conversion of)

Verilog 编写的ISP1362的控制器IP核，altera公司DE2系统中的源程序-Verilog prepared ISP1362 controller IP core, altera company source DE2 System

1路视频光端机的发射端，VHDL源码，使用全FPGA芯片的硬件，内建成帧、时钟、SERDES-The launch of a video PDH client, VHDL source code, use the whole FPGA chip hardware, built-in framing, clock, SERDES

使用vhdl语言实现了数字滤波器，在Spartan-6上验证通过，最大支持240阶。源代码中滤波器为低通滤波器，可通过matlab中的fdatool工具生成滤波器系数，然后更改滤波器的通带和阻带。

用fpga驱动lcd的原代码，是用vhdl语言实现的-drive lcd by fpga，the source program is written by vhdl

说明：  这是32位移位寄存器，是用verilog编写的，能够实现从1到31位的左或右的移位(This is a 32-bit shift register, is prepared verilog, can be realized from the 1-31 shift left or right)