buffer for in/out data.

完成交通灯的所有功能，已经通过验证。希望大家多多指教。(Completion of all the features of traffic lights, have been authenticated. Hope the exhibitions.)

用于测试ACEX1k30的流水灯程序，晶振频率为20mhz。运行环境Maxplus2-for testing the water ACEX1k30 lights procedures, the frequency of 20MHz crystal oscillator. Operating environment FLEX10K

说明：  高速流水的SDRAM控制器，最高速度可达速度在200M左右(high speed SDRAM controller)

stm32与fpga之间的通信，协议是SPI的，可双向通信（双向通信需要自己例化，只例化了fpga到stm32）(Communication between STM32 and FPGA, the protocol is SPI, two-way communication (two-way communication needs to be taken as an example, only FPGA to STM32))

code for fft non synthesisable in xilinx ise

说明：  处理器系统，处理器加上存储器，从存储器取出指令放入处理器执行(processor system, instructions stored in ROM, a counter generate address and the processor execute instructions.)

采用倍频及1/3、1/12倍频绘制的路面不平度频谱图（自编）(Using octave and 1/3, 1/12 octave drawn road roughness spectrum (self))

数字密码锁的vhdl实现，包括设置密码，修改密码，报警。

A Dec example written in VHDL.

ep2c5 实现 段寄存器 verilog语言，quartus 2 仿真-the realization of paragraph ep2c5 register verilog language, quartus 2 Simulation