useful VHDL document for programmer

说明：  verilog实现misp架构，并且支持modelsim仿真(Verilog implements MISP architecture and supports Modelsim simulation)

vc707 board ucf xdc files

基于vhdl的pid控制器设计，可以用quartus等软件实现。数字控制系统pid设计源代码。(Pid controller based on VHDL design, can use the quartus software implementation, etc. Digital pid control system design of source co)

VHDL写时钟，分频模块什么，实现计时。定点报时，定点闹钟，显示年月日。(verilog HDL)

用VHDL语言实现了DES加密算法，其中包含了测试程序，能够进行仿真。(Using VHDL language implementation of the DES encryption algorithm, which contains the test procedures can be simulated.)

vhdl code for fir filter

实现A/D转换,给定输入，观察输出电压，VHDL程序。(Implement A/D conversion，Given input, observe the output voltage, VHDL program.)

led学习控制l44444444444444(led verilog led ccccccc)

简要地说明时序约束的内容，对入门级的朋友相当起到引导的作用(Briefly describes the content of timing constraints on entry-level friends rather play a guiding role)

4*4键盘小程序 两种算法内附检查LED(4* 4 keyboard applet containing two algorithms check the LED)