Xilinx,Altera,ARM,AVR,S52,Lattice等系列FPGA的下载线电路图和PCB

 音频信号先经过由运放和电阻组成的50Ohm阻抗匹配电路以满足输入阻抗50 Ohm的系统要求，这样方便信号功率的计算。为了保证所处理的信号被不失真的采样，信号还要通过截止频率为10Khz的抗混叠低通滤波器。最后为了AD能正确的采样，信号还要通过信号抬高电路。 经过12位A/D转换芯片MAX144转换后的数字信号经由基于FPGA的NIOSII处理器进行FFT变换和处理，分析各个频率点的功率值，并将这些值显示在LCD上。 该源代码就是fft变换的源代码

BIOMETRIC VICE RECOGNITION

8b10b编解码，用于光通信和千兆以太网，verilog编写，已验证(8b10b codec for optical communications and Gigabit Ethernet, verilog prepared Verified)

说明：  Simple UART for FPGA is UART (Universal Asynchronous Receiver & Transmitter) controller for serial communication with an FPGA. The UART controller was implemented using VHDL 93 and is applicable to any FPGA. Simple UART for FPGA requires: 1 start bit, 8 data bits, 1 stop bit! The UART controller was simulated and tested in hardware.

用FPGA实现sos摩尔密码，即输出电平信号短长短。就是有次序的控制输出莫斯密码的“点”，“画”和“间隔”。而 control_module.v 是一个简单的定时触发器，每一段时间都会使能sos_module.v。(Realized by FPGA sos mole password, the output signal level of short duration. There is a sequence of output control points Moss password, painting and intervals. And control_module.v is a simple timer triggers, each period of time will enable sos_module.v.)

一段很好地讲述PWM的VHDL硬件代码，可以在不同SOPC上运行实现

同步串行数据发送电路SSDT的基本功能是将并行数据转换成串行数据并进行同步发送。系统写入和读出时序完全兼容Intel8086时序。 系统以同步信号开始连续发送四个字节，在发送中出现5个1时插入一个0，在四个数据发送结束而下一次同步没有开始之前，发送7FH，这时中间不需要插入零 -synchronous serial data transmission circuit SSDT the basic function is to convert parallel data into serial and the same this step. System write and read sequential fully compatible Intel8086 timing. Synchronized signal system to start sending four consecutive bytes, in this emerging 5 1:00 insert a 0, at the end of four data sent and the next synchronization not started before, sending seven FH, then the middle is not inserted

这是基于Quartus2 开发环境和verilog hdl语言写的38译码器(This is based development environment and Quartus2 verilog hdl language used to write decoder 38)

This is a simple example of FIFO(first in and first out) module written in verilog code(This is a simple example of FIFO (first in and first out) module written in verilog code)

说明：  Verilog开发的，MII接口的百兆以太网UDP代码(100 megabit Ethernet UDP code of MII interface)