DDR SDRAM控制器verilog代码及中文说明文档

In this design, it is assumed that a buffer sized as 1024x8 bits provides main data including scale factors and Huffman code bits to Huffman decoder. Also, it is assumed that a memory with 1024x8 bits is ready for each component to write or read the output or input 576 frequency lines.(This folder contains three directories: Huffman, IMDCT and Filterbank, each of them includes all the VHDL source codes of the component.)

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，若是需要使用，需要添加IP核，否则无法运行

此文件将帮助您了解如何理解和描述硬件软件二中的和在与 techbench 模型 sim 中模拟。此文件包括模块时钟分频器、 时钟计数器、 显示。谢谢你 ！

说明：  本书纸版由机械工业出版社于2014年出版，张强编著，电子版由华章分社（北京华章图文信息有限公司）全球范围内制作与发行(The book was published in paperback by China machine press in 2014, and edited by zhang qiang. The electronic version was produced and distributed worldwide by huazhang branch (Beijing huazhang graphic information co., LTD.))

讲述了dds直接数字频率合成的基本原理，同时用ＶＨＤＬ语言编写dds原代码用于生成正弦波，并在ISE开发平台进行仿真和MATLAB验证正弦波输出结果(described dds direct digital frequency synthesis of the basic tenets addition to the use of VHDL prepared dds source used to produce sine, and ISE development platform for simulation and verification MATLAB sine wave output)

cvery high compatibles for quartus

此为数学形态滤波器消燥的代码，用于一维信号，涉及一个具体的例子，需要的话可以自己修改，修改相应的结构元素。(This is a mathematical morphology filter away dry code, used to one dimensional signal, involving a concrete example, necessary can change ourselves, change the structure of the corresponding elements)

数字钟vhdl实现，在线测试无误，具有闹钟，对表功能(Digital clock vhdl implementation, online testing is correct, with alarm, the table function)

说明：  FPGA应用状态机版，适合初学者学习状态机三段式，ASMD图的理解和翻译，以及Verilog语言的应用 最后对仿真的一些理解 其中包含HDL设计及testbench描述 根据要求设计了一个能求出一个32bit字中两个相邻0之间最大间隙的电路。(FPGA application state machine version, suitable for beginners to learn state machine three-stage, ASMD chart understanding and translation, and Verilog language application. Finally, some understanding of simulation, including HDL design and testbench description According to the requirements, a circuit is designed to find the maximum gap between two adjacent zeros in a 32 bit word.)

Dualport Ram access read and write