用vhdl实现24小时计数器，方法简单实用。 仿真环境MAXPLUS

verilog 我自己写得按单脉冲发生器，通过了综合和仿真，和频率可变的正弦波发生器，-verilog I write by a single pulse generator, through the synthesis and simulation, and variable frequency sine wave generator,

特权同学主讲的FPGA设计的时序约束专题（STA部分）(Speaker privileged classmates timing constraints for FPGA design topics (STA section))

FPGA 数码管接口例化编程，学习初级入门verilog编程技术(FPGA 数码管接口例化编程)

DDR SDRAM控制器的VHDL代码已经测试-DDR SDRAM controller VHDL code

VHDL,简易音频数字相位表的设计与实现 数字相位测量仪在工业领域中经常用到的一般测量工具，主要应用与同频率正弦信号间的相位差的测量显示。 本系统采用FPGA实现测量的核心部分，主要由数字鉴相、累加计数器、控制器以及寄存与显示译码电路组成。该系统硬件电路简单，整个系统采用硬件描述语言VHDL作为系统内部硬件结构的描述手段，在XILINX公司的ISE9.1的软件支持下完成。可以对20Hz~20kHz频率范围内的音频信号进行采样鉴相处理，并将数据传回FPGA进行相位差计数累加、测量运算，最后送显示译码电路显示，测相范围为 ，相位测量误差 < 。 经测试结果验证，本系统充分利用FPGA对数据的高速处理能力，是系统设计高效、可靠，处理速度快，稳定性高，易于实现。 (VHDL, simple audio digital phase Table Design and Implementation of the digital phase meter general measurement tools are often used in the industrial field, the measurement of the phase difference between the main application with the same frequency sinusoidal signal. The system uses the FPGA implementation of the core part of the measurement, mainly by the digital phase, cumulative counter, the decoding circuit of the controller as well as storage and display. The system hardware circuit is simple, and the entire system using hardware description language VHDL system means a description of the internal hardware structure, completed in the XILINX company ISE9.1 software support. The audio signal in the frequency range of 20Hz ~ 20kHz sampling KAM-phase process, and the data returned FPGA retardation counted accumulation measuring operation, and finally sent to the decoding circuit, the scope of the measurement phase, the phase measurement error < . The test results verify the full u)

用VHDL语言仿真交通灯 用VHDL语言仿真交通灯-Simulation using VHDL language VHDL language with traffic lights traffic lights Simulation

emmc控制芯片CMD命令线主机接口模块,(emmc control chip CMD command line host interface module)

数控分频器设计:对于一个加法计数器，装载不同的计数初始值时，会有不同频率的溢出输出信号。计数器溢出时，输出‘1’电平，同时溢出时的‘1’电平反馈给计数器的输入端作为装载信号；否则输出‘0’电平。 -NC divider design : an adder counter, loading the initial count value, have different frequency output signal of the overflow. Counter overflow, the output"1 "Level, Overflow at the same time the"1 "level feedback to the counter input signal as loading; Otherwise output"0 "level.

ALTERA　NIOS处理器实验，编程环境是QUARTUS，在NIOS SHELL下编译实现功能。实验USB接口-Altera NIOS processor experiments, programming environment is QUARTUS in NIOS SHELL compiler functionality. Experimental USB interface

基于DE2开发板的VGA显示模块，仅供大家参考(DE2 development board based on the VGA display module, for your reference)