基于FPGA的数字频率计VHDL源码（精确到1.1hz至20.0mhz）

设计一个十进制计数器模块，输入端口包括 reset、up_enable 和 clk，输出端口为 count 和 bcd，当 reset 有效时（低电平），bcd 和 count 输出清零，当 up_enable 有效时（高电 平），计数模块开始计数（clk 脉冲数），bcd 为计数输出，当计数为 9 时，count 输出一 个脉冲（一个 clk周期的高电平，时间上与“bcd=9”时对齐）(Design of a decimal counter module, input port, including the reset up_enable clk, output port for the count and bcd, when reset is active (low), the bcd and count output cleared up_enable active (high), count module starts counting the (the CLK pulse number), the BCD count output when the count 9, the count output of the high level, the time of a pulse (a clk cycle with " bcd = 9" when aligned))

这是OFDM调制matlab的程序，中间详细描述了调制的过程，希望对大家有用。(This is the OFDM modulation matlab procedures, a detailed description of the intermediate modulation process, I hope useful.)

基于vhdl的按键检测程序。可以有效消除抖动(vhdl key dectect program)

用verilog语言编写的4位算术逻辑单元ALU,功能参考74181，包含.v文件以及测试用.vwf文件(Verilog languages with four arithmetic logic unit ALU, functional reference to 74,181, including. V documents and testing. Vwf document)

说明：  4位数码扫描显示电路,我们控制一个七段LED需要8个输出端口；如果要输出四位十进制数，就需要32的输出端口，这将占用大量的端口资源。采用串行扫描显示，我们只需要8+4共12个端口即可。其原理是：用一个四位的输出端控制，某一时刻只选中其中的一个LED（输出为‘1’表示选中），八位的输出端将该LED所需要显示的值输出；然后四位的输出端值改变，选中下一个LED。这样依次类推。如果选择的频率很快，达到50Hz以上，由于人眼的视觉暂留效应，看起来就像4个LED同时显示。 设计一个程序，输入四个一位十进制数，用4个LED显示出来。CLK采用频率可调信号发生器，逐渐改变频率，观察扫描频率的改变对输出效果的影响。 输入：连续脉冲，逻辑开关；输出：七段LED。 (4 digital scanning display circuit, we need to control a seven-segment LED output port 8 If you want to output four decimal numbers, you need the output port 32, which will take up a lot of ports. Serial scans showed, we need only 8 of 12 ports can be+4. The principle is: the output of four with a control, a time to select only one LED (output 1 is selected), 8 output of the LED by the need to show the value of the output then The output value of the four changes, select the next LED. This and so on. If you select the frequency rapidly, reaching more than 50Hz, as the human eye s persistence of vision effect, looks like a 4 LED display simultaneously. Design a program, enter a decimal number four, with four LED display. CLK signal generator with adjustable frequency, gradually changing the frequency of observed changes in scan frequency effect on the output. Input: Continuous pulse, logic switches output: seven-segment LED.)

vhdl编程语言电子书，英文的，有很多例子(VHDL programming language e-books, in English, there are many examples of)

自己总结的Altera_LVDS的IP核的设计及仿真分析，已在实际工程中应用到，并且带有源代码和仿真代码，总结的文档，非常有用。(My summary of the Altera_LVDS IP kernel design and simulation analysis, has been applied in practical engineering, and with source code and simulation code, summary of the document, very useful.)

Xilinx Sysgen User Guide

verilog 双模块算术平均值计算模块，子模块在时钟上升沿技术，高层模块根据当前计数值计算算数平均(verilog double module arithmetic mean calculation module, sub-module in the clock rising edge technology, high-level module is calculated based on arithmetic average of the current count)

Verilog HDL 写的SVPWM 算法的实现，使用的是altera 风暴系列的FPGA，占用资源1w+逻辑宏单元(Verilog HDL ，SVPWM)