fenpinqi de vhdlchengxu gongnengfnagzhen，政

利用VHDL语言实现PID控制,已经过调试验证。(Using VHDL language to implement PID control)

计时器=================(Timer =================)

显示频率测量，外接24MHz晶振，显示数据为三位，分四个档来测量-show frequency measurement, external 24MHz crystal oscillator, the data show that three, four hours to measure stalls

基于FPGA的交通灯代码，VHDL语言书写。适合新手学习vhdl语言时使用(FPGA-based traffic light code, VHDL language writing. Suitable for novice learning vhdl language used when)

不错的Quartus II 与modelsim结合仿真简介笔记，较为适合初学者，希望对大家有帮助！()

UART功能,可以增加在NIOS2內,主要來做外部Flash的擦除及寫入,需搭配上位機傳輸字串來控制(UART function, can increase the NIOS2, the main external Flash to do the erase and write, to be a string with the host computer to control the transmission)

提供了利用 GPIF 对 FX2LP 与同步 FIFO CY7C4625-15AC 之间的接口进行设计的源代码(Provides for the use of GPIF FX2LP and synchronization FIFO CY7C4625-15AC to design the interface between the source code)

这是一个基于可编程逻辑器件的程序，用来实现自动转换量程频率计控制器，该程序在可以再仿真器上仿真实现-This is a programmable logic device based on the procedures used to automatically convert the frequency range of the controller, the program can be in the simulation simulator

VHDL is defined by IEEE Standard 1076, IEEE Standard VHDL Language Reference Manual (the VHDL LRM). The original standard was approved in 1987. IEEE procedures require that standards be periodically reviewed and either reaffirmed or revised. The VHDL standard was revised in 1993, 2000, and 2002. In each revision, new language features were added and some existing features enhanced. The aim in each revision was to improve the language as a tool for design and verification of digital systems. Since the 2002 revision, there have two parallel efforts to further develop the language. The first was the VHDL Procedural Interface (VHPI) Task Force, a subcommittee of the IEEE P1076 Working Group. The VHPI Task Force prepared an interim amendment to the standard, formally approved by IEEE in March 2007. The amendment is titled IEEE 1076c, Standard VHDL Language Reference Manual―Amendment 1: Procedural Language Application Interface.

数字脉冲宽度调制，将输入的数字信号转换为对应占空比的模拟波形(Digital pulse width modulation, the digital signal is converted to the corresponding input of the duty cycle of the analog waveform)