差错控制编码技术.doc

FPGA实现差错控制编码技术
中文提要
本文首先介绍了电子设计自动化(EDA)技术的主要特征、现状和前景,并就课题的研究方向做了有关论述;进一步研究了EDA技术的发展对电路设计方法的影响,深入探讨了用VHDL语言和复杂系统可编程逻辑器件(CPLD)开发的基本方法,作为应用对象,进一步研制、开发了循环冗余差错校验编码(CRC)、RS(255,239)编码和MD5编码。通过对前两种编码各个模块的设计,完整阐述了对前两种编码软件部分的设计;又通过硬件的测试,完善,修改,最终完成了各自独立的编码程序。基于VHDL语言,利用FPGA器件开发的差错控制编码系统,采用了自顶向下的设计方法,系统的顶层设计和底层设计采用原理图输入描述和VHDL语言进行设计,选用当前应用最广泛的EDA软件QUARTUS II作为开发平台,所有程序全部通过了该平台的编译和功能仿真测试,得出了实际的仿真波形,最后,对设计调试过程中出现的问题进行了分析、研究、解决。我还对上述这些各种编码的异同点进行了总结,对MD5编码进行了算法分析,从而对这些编码进行研究。
关键词:
循环冗余差错校验编码 FPGA QUARTUS II VHDL语言 RS编码 MD5
Abstract
This text first introduction electronics design automation(EDA) technique of main characteristic, present condition and foreground, and topic of research the direction did relevant discuss;Further research EDA technique of development to electric circuit design method of influence, thorough study use VHDL language plications system programmable logic spare part(CPLD) development of basic method, Be application object, further develop, development circulation redundancy mistake the school check code(CRC), RS(255,239) code and MD5 to two kinds of ex- code each mold piece of one by one introduction, integrity elaborate to two kinds of ex- code software part of design;The test passed hardware again, perfect, modification, pletion independence of respectively code to the VHDL language, application FPGA spare part development of mistake control code system, adoption from crest get down of design method, the crest of the system layer design and first floor design adoption principle diagram importation description and the VHDL language carry on design, choose to use current application most extensive of EDA software QUARTUS II Be development terrace, all all of the procedures passed that edit and translate of terrace and function to imitate true test, give actual of imitate true wave form, end, to design adjust to try to appear in the process of the problem carried on analysis, research, return various to these code o