Xilinx FPGA moving data across asynchronous clock boundaries

4位ALU,有两个4位输入，4位输出实现逻辑运算和算术运算，逻辑与或非，加1，减1等等功能(4 ALU, logical and arithmetic operations)

VHDL 快速参考手册，简要概括了VHDL，非常适合做开发参考-VHDL Quick Reference Guide, a brief summary of VHDL, is well suited to do the development of reference

I2C 控制器的 Verilog源程序2(I2C controller Verilog source 2)

PS2键盘控制器的VHDL源码，用FPGA直接读取键盘的输入并显示。(PS2 keyboard controller VHDL source code, with a direct FPGA to read keyboard input and displayed.)

基于FPGA的正弦脉宽调制波vhdl代码，同时输出正弦波与SPWM(Sine pulse width modulation wave VHDL code based on FPGA, at the same time with SPWM output sine wave)

说明：  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.)

ADI JESD204接口的ADC与Xilinx FPGA接口IP，包含Verilog和VHDL源代码，AXI总线接口，ADC串行控制接口(ADI IP for interfacing JESD204 ADC to Xilinx FPGA, include Verilog/VHDL source code, AXI interface and serial config interface )

Xilinx CPLD源代码，使用XC9500系列CPLD,驱动液晶-Xilinx CPLD source code, use the XC9500 series CPLD, LCD Driver

this program is a simulation for Aloha

异步fifo实现，通过双口ram实现异步fifo(Asynchronous FIFO implementation, through dual port RAM to achieve asynchronous FIFO)