一种学习用的小程序，主要用与VHDL仿真的全加器的一段代码！大家可以下载进行修改于仿写...

说明：  通过监测工作状态实现带有IIC通讯功能的数据发送接收(to implement the sending and receiving data function of iic communication )

设计制作一个可容纳4组参赛者的数字智力抢答器，每组设置一个抢答按键； 电路具有一第一抢答信号的鉴别和锁存的功能。在主持人将系统复位并发出抢答指令后，若参加者按抢答键，则该组指示灯亮并用组别显示抢答者的组别。此时，电路具有自锁功能，使别组的抢答开关不起作用。 设置计分电路。每组在开始时预置成6分，抢答后主持人计分，答对一次加1分。(The design can accommodate a the Entrants digital intellectual Responder, each set answer in a key circuit has a first answer in the signal to identify and latch functions. Host to the system reset and sent the answer in instruction, participants answer in key, the group of the group light and display the answer in the group. At this point, the circuit has a self-locking function does not work in other groups to answer switch. Set Scoring circuit. Preset six points each at the beginning of the answer in scoring after the host, answer time, add 1 point.)

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)

说明：  使用Verilog编写的24位定时器，具有apb 总线接口，可以设置工作方式和计数初值。(The 24-bit timer written by Verilog has APB bus interface, which can set working mode and count initial value.)

VHDL黄金参考手册，能让你更好的学习了解VHDL语言(VHDL gold reference manual, can make you a better learn VHDL language)

Synchronous DRAM (SDRAM) has become a mainstream memory of choice in embedded system memory design due to its speed, burst access and pipeline features. For high-end applications using processors such as Motorola MPC 8260 or Intel StrongArm, the interface to the SDRAM is supported by the processor’s built-in peripheral module.

说明：  用FPGA完成256*8的存储器的读写操作( complete reading and writing 256* 8 memory with FPGA )

时钟分频代码，PWM产生 RTL 源代码。(clock divider，PWM generator RTL Source Code)

这份代码完成的功能是通过蜂鸣器播放《梁祝》这首曲子，当然可以自行更改代码，以播放其它的乐曲，所用的硬件描述语言是VHDL，代码有四部分构成，顶层模块、预分频模块（产生基频）、音乐表格和分频模块（产生所需的各音调）。

this fpga spartan 3e based project file .the project is the game based on vga. this file contains 2,20,25,400Hz clock generating file as per required for the project.-this is fpga spartan 3e based project file .the project is the game based on vga. this file contains 2,20,25,400Hz clock generating file as per required for the project.