阿喜大师验证环境系统verilof

基于FPGA的正弦脉宽调制波vhdl代码，同时输出正弦波与SPWM(Sine pulse width modulation wave VHDL code based on FPGA, at the same time with SPWM output sine wave)

设计一简易数字频率计，其基本要求是： 1)测量频率范围0～999999Hz； 2)最大读数999999HZ,闸门信号的采样时间为1s；. 3)被测信号可以是正弦波、三角波和方波； 4)显示方式为6位十进制数显示； 5）具有超过量程报警功能。 5)输入信号最大幅值可扩展。 6）测量误差小于+-0.1%。 7)完成全部设计后，可使用EWB进行仿真，检测试验设计电路的正确性。(The basic requirements of designing a simple digital frequency meter are: 1) The measuring frequency range is 0-999999 Hz. 2) The maximum reading is 999999HZ, and the sampling time of gate signal is 1 s. 3) The measured signal can be sine wave, triangle wave and square wave. 4) The display mode is 6-bit decimal number display. 5) It has alarm function beyond range. 5) The maximum amplitude of input signal can be expanded. 6) The measurement error is less than +0.1%. 7) After completing all the design, EWB can be used to simulate and test the correctness of the circuit.)

SD卡读写源代码.用Verilog编写.很不错.值得借鉴.特别对SD卡开发的人员!(SD card reader-writer source code. Prepared to use Verilog. Is pretty good. Be used for reference. In particular, the development of personnel SD card!)

基于FPGA的QPSK调制解调，正交调制输出，解调包括NCO,载波同步，定时同步。modelsim仿真实测通过。

RGB vga driver for manipulating the colours of a given image buffer. The code has beeen written in vhdl

? 熟悉IIC协议总线协议，采用IIC总线对图像采集传感器寄存器进行配置，并转换为RGB565格式。 ? 利用异步FIFO完成从摄像头输出端到SDRAM 和SDRAM 到VGA 接口各跨时钟域信号的传输和处理。 ? 利用 SDRAM 接口模块的设计，实现了刷新、读写等操作；为提高SDRAM 的读写带宽，均采用突发连续读写数据方式；并采用乒乓操作实现 CMOS 摄像头与VGA的帧率匹配。 ? 利用双线性插值方法实现对图像640×480到1024×768的放大操作。 ? 完成VGA显示接口设计。(Familiar with IIC protocol bus protocol, IIC bus is used to configure the register of image acquisition sensor and convert it into RGB565 format. Asynchronous FIFO is used to transmit and process signals across clock domain from camera output to SDRAM and SDRAM to VGA interface. With the design of SDRAM interface module, refresh, read and write operations are realized. In order to improve the read and write bandwidth of SDRAM, burst continuous read and write data mode is adopted, and table tennis operation is used to achieve frame rate matching between CMOS camera and VGA. The bilinear interpolation method is used to enlarge the image from 640*480 to 1024*768. Complete the VGA display interface design.)

i2c配置SAA7113，非常有用的程序，做视频采集类必看(i2c configure SAA7113)

A multiplier unit in VHDL

基于Verilog语言的8位数据32位校验码，本模块以一次读取256个数据为例，循环产生32位校验码，对数据进行校验，反校验时，读取校验256位数据后在对产生的32位校验码取反校验，会产生一个32位crc校验的固定数据

hdlc协议的封装与解析，fsc校验，完整的例程代码(Decode and Encode an HDLC packet ，using FCS16 calculation)