一个用VHDL完成的8位数显的16进制的频率计

出租车vhdl程序，并带有testbench仿真程序，通过开始按键复位，然后根据行使信号进行公里计数，起步价3公里8元钱，超过3公里一公里1元钱(Taxi vhdl program, with a testbench simulation program, started by the reset button, then the exercise kilometer count signal, starting at 3 km 8 yuan, more than three kilometers one kilometer dollar.)

设计一个简单的自动售饮料机的逻辑电路。它的投币口每次只能投入一枚五角或一元的硬币。投入一元五角钱硬币后机器自动给出一杯饮料。投入两元（两枚一元）硬币后，在给出饮料的同时找出一枚五角的硬币。

时间同步后即可确定每帧数据的起始位置，这样就能完整的截取下每一帧。但是，数据中还带有频偏信息。在常规的通信系统中，多普勒很小仅仅会带来很小的频偏，但是在大多普勒的情况下，频偏将非常大，20马赫的速度将会带来将近34K的频偏。因此，如何很好的纠正频偏即为本系统的难点。 OFDM中，我们将大于子载波间隔倍数的频偏称为整数倍频偏，而将小于一个子载波间隔的频偏称为小数倍频偏。频偏矫正精度只要能保证小于十分之一倍的子载波间隔，频偏就不会对均衡和解调造成影响。本文中我们借鉴这种思想，由于硬件资源限制，我们将在接收端做64点FFT，即相当于将频域划分为64份，我们将小于 的频偏称为小数倍频偏，将 整数倍的频偏称为整数倍频偏。本程序即基于SCHIMDL经典方法完成小数倍频偏纠正(After time synchronization can determine the starting position of each frame data, so you can complete the interception of each frame. However, in the data with frequency information. In conventional communication systems, doppler small will bring only small deviation, but in the case of most of the doppler, frequency PianJiang is very large, 20 Mach speed will lead to deviation of nearly 34 k. Therefore, how to good to correct deviation is the difficulty of this system. OFDM, we will be bigger than the sub-carrier spacing ratio of frequency deviation is called the integer frequency offset, and the interval will be less than a child carrier frequency offset is called decimal frequency doubling. Deviation is less than one over ten times as long as can guarantee accuracy of sub-carrier spacing, deviation will not affect balance and demodulation. This article, we draw lessons from the idea, due to the limited hardware resources, we will do 64 points FFT at the receiving end, which is equ)

基于quartus的3-8译码器,可作为大型系统的译码器模块-Based on quartus a 3-8 decoder can be used as large-scale system decoder module

自写的巴克频带滤波器组代码，生成频带滤波器组。内涵debug：输出生成的滤波器(Barker band filter bank code that generates band filter bank. Connotation debug: output generated filter)

FPGA开发全攻略，工程师创新宝典，由张国斌等书写-FPGA development

单片机通过总线，将占空比和频率送到CPLD/FPGA中，并控制PWM输出.采用Verilog HDL语言编写。(Microcontroller by bus, the duty cycle and frequency sent to the CPLD/FPGA in, and control the PWM output. Using Verilog HDL language.)

基于FPGA的1024点流水线工作方式的FFT实现,适合fpga的技术人员做信号处理参考-FPGA based on the work of the 1024-point pipelined FFT approach the realization of the technical staff for doing fpga signal processing reference

说明：  verilog语言写的SPI接口,全同步设计,低门数,可以很容易应用到嵌入设计方案中.(Verilog language to write the SPI interface, all synchronous design, low gate count. it is very easy to use embedded design programs.)

用verilog编写在FLEX10K上实现的简易CPU-used in the preparation of Verilog FLEX10K achieve simple CPU