vhdl学习程序

modelsim设计的可调占空比的方波程式-modelsim designed adjustable duty cycle of the square wave program

本代码介绍了使用VHDL开发FPGA的一般流程，最终采用了一种基于FPGA的数字频率的实现方法。该设计采用硬件描述语言VHDL，在软件开发平台ISE上完成，可以在较高速时钟频率（100MHz）下正常工作。该设计的频率计能准确的测量频率在1Hz到100MHz之间的信号。使用ModelSim仿真软件对VHDL程序做了仿真，并完成了综合布局布线，最终下载到芯片Spartan-II上取得良好测试效果。-the code on the FPGA using VHDL development of the general process, finally adopted a FPGA-based digital frequency method. The design using VHDL hardware description language, the software development platform ISE completed, the higher speed clock frequency (100MHz) under normal work. The design of the frequency meter can be accurately measured in a frequency of 100MHz between Hz signal. Use ModelSim VHDL simulation software to do the simulation process, and completed a comprehensive layout cabling, downloaded to the final chip Spartan-II made good on the test results.

本代码可以用于产生正余弦信号波形，利用FPGA内部的ROM放置一个正余弦采样点的数据表格，通过循环取址的方法，实现波形连续输出。-This code can be used to generate positive cosine signal waveforms, using FPGA" s internal ROM to place a sampling point is the cosine of the data tables, the circulation method of taking the site to achieve a continuous output waveform.

基于VHDL的数字频率计的设计.pdf 基于VHDL的频率计设计 很好用的 希望要用的同志来下载 (基于VHDL的频率计设计 很好用的 希望要用的同志来下载 )

led 发送卡代码(led send card verilog)

OFDM通信系统设计与仿真(shuoshilunwen)(OFDM System Design and Simulation )

基于FIPS 180-4标准的SHA-1算法的verilog HDL实现，分模块分别实现(FIPS 180-4 standard SHA-1 algorithm-based verilog HDL sub-modules, respectively, to achieve)

CODE_VHDL_COUNTING 0 到 9，使用按钮 (Đếm 慈 0 đến 9 hiển 施耐 1 带领 7 đoạn sử dụng nút nhấn để điều khiển) Với bài này tôi sử dụng một nút nhất để một nút nhấn đế bắt đầu đếm dữ liệu 将重置。

数字时钟，可以实现(1) 显示日期功能（年、月、日、时、分、秒以及） (2) 可通过按键切换年、月、日及时、分、秒的显示状态 (3) 可随时调校年、月、日或时、分、秒 (4) 可每次增减一进行时间调节 (5) 可动态完整显示年份，实现真正的万年历显示 (6) 可显示温度 (Digital clock, can be achieved (1) the date function (year, month, day, hour, minute, seconds as well) (2) through the key switch the year, month, day in a timely manner, minute, second display state (3) at any time adjust the year, month, day or time, minutes, seconds (4) can be added or deleted, a time adjustment (5) can be dynamically complete display Year, the real calendar display (6) to display temperature)

ALTERA上DE2平台，利用内部50M Hz时钟，在数码管模拟显示时间(时分秒)。-ALTERA on DE2 platform, using internal 50M Hz clock, in the digital control simulation show time (hours minutes and seconds).