VHDL ip core的设计，软核的设计方法

FPGA实现SPI接口的从机功能，接收和发送全双工运行，接收到的数据以八位LED灯显示(FPGA to achieve the SPI interface the machine function, receive and send full-duplex operation, the received data to eight LED lights)

writing testbench in system verilog

3x3中值滤波器的FPGA实现现(VERILOG)可直接使用。 (3x3 median filter FPGA implementation of the present (VERILOG) can be used directly.)

基于fpga的verilog实现ad及uart，并进行仿真验证(Verilog based on FPGA implements AD and uart, and carries out simulation verification)

本例程位于 VMD642_CPLD目录中。 使用 CPLD 实现辅助译码、LED 指示灯控制、看门狗等各种逻辑控制电路。源程序使 用 Verilog HDL书写，编译开发系统使用 Cypress公司的 Warp 6.3。(This routine is located VMD642_CPLD directory. Using CPLD implementation auxiliary decoding, LED indicator control, watchdog, and other logic control circuitry. Written using Verilog HDL source code, the compiler development system using Cypress' s Warp 6.3.)

本程序实现不同频率时钟的产生及其相互转化-this program different clock frequencies to the formation and transformation

在Quartus环境中，采用VHDL语言编写的出租车计费系统，系统共分为分频、状态切换、记程、计费等模块，模仿现实中出租车计费。-In the Quartus environment, the use of VHDL language taxi billing system, the system is divided into sub-frequency, state switching, recording process, billing and other modules, to imitate reality, taxi billing.

基于fpga的fskpsk信号产生器，可实现对1.2kHz和2.4kHz正弦波的采样-based on the fpga and fskpsk signal generator,can achieve sample to the 1.2kHz and 2.4kHz sin wave

A 4 bit twisted ring counter is a sequential circuit which produces the following sequence of output values: 0000, 1000, 1100, 1110, 1111, 0111, 0011, 0001 and then repeats. Design a circuit for a 4 bit twisted ring counter that uses four D flip flops. Draw a state transition diagram, a state table and a schematic for your circuit. Design an alternate implementation using just three flip flops and draw a state transition diagram, state table and a schematic for your circuit. If your designs are extended to implement an n bit twisted ring counter, how many flip flops are required using each of the two approaches. In what situations would you prefer the first method? In what situations would you prefer the second?

电子密码锁的vhdl编程实现，不知以前有没有人做过的。-electronic locks VHDL programming, I wonder if the past is not done.