用verilog写的cpld的各种分频程序，希望大家指正，谢谢！

在Altera开发板上实现RS232串口通信，平台为CycloneII，可通过QuartusII软件修改引脚移植到其它平台(Realize RS232 serial communication on Altera development board, platform for CycloneII, through software QuartusII modify pin portable to other platforms)

mux2to1.vhd二选一电路mux2_1.vhd二选一电路mux2_1.bdf二选一电路mux3to1.vhd三选择电路mux3to1_1.vhd三选一选一个电路mux4to1.vhd 4

定时器加数码管显示源码，以及test bench测试模块源码，经modelsim仿真结果正确(Timer plus digital display source code, and test bench test module source code, by modelsim simulation results are correct)

单片机通过总线，将占空比和频率送到CPLD/FPGA中，并控制PWM输出.采用Verilog HDL语言编写。(Microcontroller by bus, the duty cycle and frequency sent to the CPLD/FPGA in, and control the PWM output. Using Verilog HDL language.)

用FPGA控制1602型液晶显示，显示一行英文语句。(show)

THE SOURCE REALIZE THE TRANSFORMATION FROM YUV TO RGB

组合电路的设计8位加法器设计(ADD8.vhd)-Combinational Circuit Design 8-bit adder design (ADD8.vhd)

说明：  一个8位RiSC单片机的VHDL代码， 具有很好的参考价值。(an eight RiSC SCM VHDL code, is a good reference value.)

SPI接口测试程序，Xilinx参考设计，ML507硬件测试通过.(SPI interface test code，Xilinx reference design，tested on ML507 platform.)

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