DDS 正弦波发生器

FPGA对SDRAM进行读写测试程序，亲测有效无误。(FPGA reads and writes test programs for SDRAM.)

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说明：  Micron公司m73a系列nand flash仿真模型及测试文件(micron m73a series nand flash simulation model and testbench)

4选1数据选择器，有使能端控制，4个数据输入，2个地址端，1个输出(4 1 data selector, enable end control, four data inputs, two addresses end, an output)

利用FPGA实现QPSK数字调制。编程采用Verilog HDL语言。(By using the FPGA realization of QPSK digital modulation. Use Verilog HDL language programming. )

有三个基于FPGA驱动高速AD/DA的程序、硬件电路图、使用向导手册、连接方法，支持ADDA_AX301，ADDA_AX415，ADDA_DB2C8，可以下载到 FPGA 黑金开发板、FPGA 黑金开发板学生版结合相关模块进行使用，

根据软件无线电的思想，提出了一种新颖的数字信号处理算法，对QPSK信号的相位进行数字化处理，从而实现对QPSK信号的解调.该算法允许收发两端载波存在频差，用数字锁相实现收发端载波的同步，在频偏较大的情况下，估算频偏的大小，自适应设置环路的带宽，实现较短的捕获时间和较好的信噪性能。整个设计基于XILINX公司的ISE开发平台，并用Virtex-II系列FPGA实现。用FPGA实现调制解调器具有体积小、功耗低、集成度高、可软件升级、扰干扰能力强的特点，符合未来通信技术发展的方向。(According to the idea of software radio, a novel digital signal processing algorithm, the phase of QPSK digital signal processing, enabling the demodulation of QPSK signals. This algorithm allows the sending and receiving ends of the carrier frequency difference exists, using digital phase-locked to achieve synchronization of sending and receiving end of the carrier, in the case of large frequency offset, frequency offset estimation of the size, adaptive set the loop bandwidth to achieve shorter acquisition time and better noise performance. The whole design is based on the company XILINX ISE development platform, and Virtex-II series with the FPGA. FPGA realization of a modem with a small size, low power consumption, high integration, software upgrades available, the characteristics of strong interference interference, in line with the future direction of ICT development.)

说明：  一个简单的千兆以太网UDP协议的实现,可以实现数据的收发和ARP，实现PC端与FPGA的以太网通信(A simple implementation of Gigabit Ethernet UDP protocol can realize data sending and receiving and ARP, and realize Ethernet communication between PC and FPGA.)

说明：  有自己制作的下载器原理图，包含了stlinkv2,XDS100V3,USBBLASTER.原理图和封装，一款多功能下载器。(Have their own production downloader schematic diagram, contains stlinkv2, XDS100V3, USBBLASTER. Schematic diagram and encapsulation, a multi-function downloader.)

快速傅里叶变换的模块，测试平台，verilog语言