HDB3 ENCODING AND DECODING METHOD

modbus通讯必须的校验码生成器，可以直接使用(modbus crc16/8 free use)

I2C控制器的源代码，Verilog HDL语言编写，可以直接调用-I2C controller source code, Verilog HDL language, you can directly call

DOCUMENT ON DISTRIBUTED ARITHMATIC

ODBC编程实例，使用ODBC对基于开关量数据采集卡的通信接口设计与实现。(ODBC programming examples, using ODBC for data acquisition card based digital communications interface design and implementation.)

STT-MRAM磁性存储器全部verilog代码和仿真验证代码，包括行为模块，读写模块和控制模块，已经经过验证完全正确(STT-MRAM magnetic memory all the code and simulation code, including behavior module, reader module and the control module, has been proven entirely correct)

vhdl的仿真 quartus 2的flv视频 -VHDL simulation of the flv video quartus 2

说明：  有关risc-v cpu的问题,里面有一些有关cpu的设计(The problem of risc-v can be solved)

说明：  VHDL语言100例详解。详细讲解了用VHDL语言进行数字电路和数字系统设计的知识。用100个实例，不仅进行基础的门电路设计，而且还有较为复杂的数字系统设计。这些实例可以直接被调用。(VHDL Elaborates on 100 cases. Detailed account of VHDL for digital circuits and digital systems design knowledge. With 100 examples, not only for infrastructure gate design, but also more complex digital system design. These examples can be called.)

verilog实际例子，非常适合初学者学习(verilog practical examples, very suitable for beginners to learn)

时间同步后即可确定每帧数据的起始位置，这样就能完整的截取下每一帧。但是，数据中还带有频偏信息。在常规的通信系统中，多普勒很小仅仅会带来很小的频偏，但是在大多普勒的情况下，频偏将非常大，20马赫的速度将会带来将近34K的频偏。因此，如何很好的纠正频偏即为本系统的难点。 OFDM中，我们将大于子载波间隔倍数的频偏称为整数倍频偏，而将小于一个子载波间隔的频偏称为小数倍频偏。频偏矫正精度只要能保证小于十分之一倍的子载波间隔，频偏就不会对均衡和解调造成影响。本文中我们借鉴这种思想，由于硬件资源限制，我们将在接收端做64点FFT，即相当于将频域划分为64份，我们将小于 的频偏称为小数倍频偏，将 整数倍的频偏称为整数倍频偏。本程序即基于SCHIMDL经典方法完成小数倍频偏纠正(After time synchronization can determine the starting position of each frame data, so you can complete the interception of each frame. However, in the data with frequency information. In conventional communication systems, doppler small will bring only small deviation, but in the case of most of the doppler, frequency PianJiang is very large, 20 Mach speed will lead to deviation of nearly 34 k. Therefore, how to good to correct deviation is the difficulty of this system. OFDM, we will be bigger than the sub-carrier spacing ratio of frequency deviation is called the integer frequency offset, and the interval will be less than a child carrier frequency offset is called decimal frequency doubling. Deviation is less than one over ten times as long as can guarantee accuracy of sub-carrier spacing, deviation will not affect balance and demodulation. This article, we draw lessons from the idea, due to the limited hardware resources, we will do 64 points FFT at the receiving end, which is equ)