VHDL开发环境，出租车计费系统，实现起步10元，每增加一公里，自动上涨2元。...

存储器DDR3在Xlinix平台上的设计教程和综合应用(Design course and comprehensive application of memory DDR3 on Xlinix platform)

说明：  DDS的基本原理主要由五部分组成，分别是；相位累加器，正弦波形存储器，数模转换器，低通滤波器和时钟，将相位累加器输出的数据作为地址，用来查询表的数据，将取出的正弦数据通过数模转换器输出模拟信号，模拟信号再通过一个低通滤波器输出纯净的正弦波信号。(The basic principle of DDS is mainly composed of five parts: phase accumulator, sinusoidal waveform memory, digital to analog converter, low-pass filter and clock. The output data of phase accumulator is used as address to query the data of table. The extracted sinusoidal data is output analog signal through digital analog converter, and the analog signal is output pure sine through a low-pass filter Wave signal.)

用NiosII实现的数字钟，经过本人测试运行正常，开发环境：QuartusII6.0和NiosII IDE6.0-NiosII achieved with digital clock, after I run the normal tests, development environment: QuartusII6.0 and NiosII IDE6.0

VHDL上百实例 包括 ADDER LATCH FIPPER AND ETC..(VHDL hundreds of examples, including ADDER LATCH FIPPER AND ETC ..)

通过UART在FPGA数码管上显示经纬度坐标的代码(By UART displayed on FPGA digital latitude and longitude coordinates of the code)

SPI串行总线接口的Verilog实现，详细讲解实现过程。-SPI serial bus interface Verilog realization elaborate on the realization of the process.

数字通信系统中, 基带信号的频谱一般较宽, 因此 传递前需对信号进行成形处理, 以改善其频谱特性,使 得在消除码间干扰与达到最佳检测接收的前提下,提高信道的频带利用率。目前,数字系统中常使用的波形成形滤波器有平方根升余弦滤波器、 高斯滤波器等。设计方法有卷积法或查表法, 其中: 卷积法的实现,需要消耗大量的乘法器与加法器,以构成具有一定延时的流水线结构。为降低硬件消耗,文献提出了一种分(FPGA Implementation of Square Root Raised Cosine Pulse Shaping Filter)

说明：  直接数字式频率合成器DDS设计、Verilog。 产生的信号可以是正弦波或方波、三角波、锯齿波等，自选。 采用DDS技术，将所需生成的波形写入ROM中，按照相位累加原理合成任意波形。 此方案得到的波形稳定，精度高，产生波形频率范围大，容易产生高频。 本实验在设计的模块中，包含以下功能： （1）通过 freq 信号输入需要的频率的值； （2）通过 wave_sel 信号选择所需的波形； （3）通过 amp_adj 信号选择波形放大的倍数。(DDS design of direct digital frequency synthesizer, Verilog. The generated signal can be sinusoidal or square wave, triangular wave, sawtooth wave and so on, optional. By using DDS technology, the required waveforms are written into ROM, and arbitrary waveforms are synthesized according to the principle of phase accumulation. The waveform obtained by this scheme is stable, accurate and easy to generate high frequency waveform. This experiment includes the following functions in the designed module: (1) Input the required frequency value through freq signal; (2) Choosing the required waveform by wave_sel signal; (3) Select the multiplier of waveform amplification by amp_adj signal.)

sourceinsight的verilog插件-The Verilog sourceinsight plug-ins

基于xilinx公司的SPARTAN6系列芯片的高速全双工串行收发器(high-speed transceiver based on spartan 6 of Xilinx PFGA)