带自适应波特率发生器UART实现，经过FPGA验证的！

tlm基本框架，生产消费模型例子 tlm基本框架，生产消费模型例子 tlm基本框架，生产消费模型例子(tlm basic framework, examples of production and consumption model)

此程序描述了数字电路中与门的逻辑功能。所采取的硬件描述语言为VHDL。程序结构采用了dataflow的写法。请大家仔细阅读。本程序已通过了Altera quartus的验证。确保准确无误。

直流电机控制器，属于精品vhdl源码，可在eda仿真工具上仿真实现-DC motor controller is excellent VHDL source code can be sown in simulation tools Simulation

在QuartusII运用ＡＨＤＬ语言，首先设计出PN发生器来产生一个11位的数据流在整个周期内有效数据有 =2047位；再设计状态机用来检测串行数据流中的序列。运用两个个计数器分别对PN码计数以及序列出现的次数计数。改变ＰＮ码结构可以作为通用数列检测器-QuartusII use in AHDL language, the first PN generator designed to generate a data stream 11 throughout the cycle has an effective data = 2047 re-designing the state machine used to detect the serial data stream in sequence. The use of two counters were counting on the PN code, as well as counting the number of sequences occur. Changes in the structure of PN code series can be used as general-purpose detector

74ls161 基于verilog语言的实现 源程序在压缩包的hdl文件夹中(74ls161 language based on the realization of verilog source package in compressed folder hdl)

 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

针对32位MIPS微处理器中CLZ指令（对单个字高位连零进行计数）的实现电路，使用了类似于超前进位的逻辑结构。包含测试文档，以及Design Compile所用的环境和脚本。(The CLZ instruction counts the number of leading zeros in a word. The 32-bit word in the GPR rs is scanned from most-significant to least-significant bit.The number of leading zeros is counted and the result is written to the GPR rd. If all 32 bits are cleared in the GPR rs, the result written to the GPR rd is 32. )

说明：  基于ALINX AX7020硬件平台的USB-OTG通信程序。操作系统采用uCOS III v1.41，基本实现了双向USB2.0 块传输（Bulk Transfer）通信，zynq的PS端接收USB数据并回传至主机。经测试，主机端Window10系统采用libUSBK编程时，采用64字节的块时，传输速率可达210Mbps。zynq开发工具为Vivado2015.4，程序包中包含了全部的硬件和软件工程文档。(A USB-OTG communication project where an AX7020 platform is employed as USB device. The embeded operating system is uCOS III of version 1.41, and the FPGA toolchain is Vivado 2015.4. This project implements a full speed bidirectional USB2.0 bulk transfer. A test on Windows 10 host with libUSBK shows that the transfer speed is up to 201Mbps.)

ALTERA NIOS处理器，VHDL语言在QUARTUS编译通过，然后有C语言在NIOS SHELL下驱动，实验音频解码-Altera NIOS processor, the QUARTUS VHDL compiler, then the C language under NIOS SHELL-driven, experimental audio decoder

用VHDL语言编写的代码，以供大家学习和交流，方便大家学习！-prepared using VHDL code for all to study and exchange to facilitate learning!