4 位纹波计数器

本代码为简单AXI接口控制模块，具备数据的读写等传输功能，对总线传输学习者来说是很好的学习资料，可在此代码基础上进行更复杂功能接口的模块的开发。

说明：  FPGA控制外边led，并实现跑马灯等多种效果，用户可以自行控制(FPGA control outside led)

FPGA时序分析说明。对于高速时钟设计中的时序分析与约束有帮助(FPGA,TIME)

本文研究了SMBus 规范，介绍了典型的基于片上系统（SoC）设计的知识产权核（IP）实现，采用自顶向下 (Top-down)的集成电路设计方法完成了设计，并架构了基于总线功能模型(BFM)的验证平台 完成功能仿真，顺利完成了逻辑综合和时序仿真。FPGA 验证和投片后测试均表明设计具有 良好的性能。(This paper studies the SMBus specification, based on the introduction of the typical system-on-chip (SoC) intellectual property core design (IP) implementation, using top-down (Top-down) of the integrated circuit design methods achieve a design and architecture based on the total Line functional model (BFM) achieve functional verification platform for simulation, successfully completed a logic synthesis and timing simulation. FPGA silicon validation and post-tests show that the design has good performance.)

基于FPGA的门级逻辑实现快速乘法运算的verilog源程序。-FPGA-based gate-level logic implementation of rapid multiplication of the verilog source.

NiosII的C代码,包括网卡,lcd,usb,串口,按键.(NiosII C code, including network cards, lcd, usb, serial, key.)

在quartusII环境下采用对编解码芯片HD6408和HD6409驱动的方式实现曼彻斯特编解码(Environment in quartusII codec chip used on the HD6408 and HD6409-driven way to achieve encoding and decoding of Manchester)

用modelsim仿真一个正弦波产生程序-modelsim simulation using a sine wave generated procedures

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)

基于Verilog的图像采集、处理和存储程序，初学者参考，高手绕道。(Verilog-based image acquisition, processing and storage procedures, beginners reference, master bypass.)