单片机的4 am2901完整的VHDL程序，am2901

说明：  ucos II 中文手册额，可以学习一下哦(UCOS II Chinese manual volume, you can learn it)

详细介绍了VHDL的28个程序。从简单到复杂。介绍详细-Details of the 28 procedures VHDL. From simple to complex. Detailed introduction

有很多例子及测试代码，对初学者很有帮助，很容易上手-a lot of examples and test code, useful for beginners, it is easy to get started

设计一简易数字频率计，其基本要求是： 1)测量频率范围0～999999Hz； 2)最大读数999999HZ,闸门信号的采样时间为1s；. 3)被测信号可以是正弦波、三角波和方波； 4)显示方式为6位十进制数显示； 5）具有超过量程报警功能。 5)输入信号最大幅值可扩展。 6）测量误差小于+-0.1%。 7)完成全部设计后，可使用EWB进行仿真，检测试验设计电路的正确性。(The basic requirements of designing a simple digital frequency meter are: 1) The measuring frequency range is 0-999999 Hz. 2) The maximum reading is 999999HZ, and the sampling time of gate signal is 1 s. 3) The measured signal can be sine wave, triangle wave and square wave. 4) The display mode is 6-bit decimal number display. 5) It has alarm function beyond range. 5) The maximum amplitude of input signal can be expanded. 6) The measurement error is less than +0.1%. 7) After completing all the design, EWB can be used to simulate and test the correctness of the circuit.)

用VHDL语言在FPGA上实现了fft算法和fir滤波

能实现输入0.5 1 5块钱的累加，然后对应购买的商品价格进行比较，显示找的钱数或错误灯(MY English is very good)

Verilog HDL 数字设计与综合，夏宇闻译。本书重点关注如何应用verilog语言进行数字电路和系统的设计和验证，不仅讲解语法，更从基本概念讲起，逐渐过渡到编程语言接口以及逻辑综合等高级主题。(The design and synthesis of Verilog HDL digital, Xia Wen translation. The book focused on how to apply the verilog language for the design and verification of digital circuits and systems, not only explain the grammar, the more I start from the basic concept, and a gradual transition to advanced topics such as programming language interface and logic synthesis.)

本程序实现数字钟系统，有整点报时功能，可显示切换年月日，定时功能(Digital clock system of this program, with the whole point timekeeping function, can display the date, the timing function)

ISE时序约束笔记——Global Timing Constraints，这个文档中详细介绍了如何使用ISE中约束工具和原理，对fpga水平提高有很大帮助(In this file , global timing constraints is introduced very clearly. It can really helps)

how to use step motor control