daima.rar_曼彻斯特_曼彻斯特VHDL_曼彻斯特编码资源-CSDN文库

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曼彻斯特

曼彻斯特编码

149 浏览量 2022-09-21 05:05:32 上传评论收藏 10KB RAR 举报

曼彻斯特编码是一种广泛应用于数字通信中的编码技术，特别是在局域网（LAN）和光纤分布式数据接口（FDDI）中。它具有自同步的特性，即数据信号中包含了时钟信息，使得接收端能够准确地解码。这种编码方式在Xilinx的复杂可编程逻辑器件（CPLD）中也有广泛应用，因为其可以有效地处理高速数据传输并减少信号干扰。曼彻斯特编码的基本原理是将每个二进制位分为两个相等的时隙，每个时隙对应一个电平变化。对于0比特，数据电平在时隙中间发生改变，从高到低或从低到高；而对于1比特，数据电平在时隙开始保持不变，然后在时隙中间改变。这种编码方式使得每个时钟周期内都有一次电平转换，从而在信号中内嵌了时钟信息，有利于数据同步。在VHDL（Very High Speed Integrated Circuit Hardware Description Language）中实现曼彻斯特编码，需要设计一个电路来根据输入的二进制数据生成相应的曼彻斯特编码。VHDL是一种硬件描述语言，用于描述数字系统的结构和行为，可以被综合成 FPGA 或 CPLD 的配置逻辑。设计时，我们需要创建一个状态机来跟踪当前的位边缘，并根据输入数据和时钟信号生成正确的输出。以下是一个简单的曼彻斯特编码器VHDL模块的概述： ```vhdl entity manchester_encoder is Port ( data_in : in std_logic; -- 输入数据信号 clk : in std_logic; -- 时钟信号 reset_n : in std_logic; -- 异步复位信号，低电平有效 data_out: out std_logic); -- 输出曼彻斯特编码信号 end manchester_encoder; architecture Behavioral of manchester_encoder is type state_type is (IDLE, HIGH_TO_LOW, LOW_TO_HIGH); signal current_state, next_state : state_type; begin process (clk, reset_n) begin if reset_n = '0' then current_state <= IDLE; elsif clk'event and clk = '1' then current_state <= next_state; end if; end process; process (current_state, data_in) begin case current_state is when IDLE => if data_in = '1' then next_state <= HIGH_TO_LOW; else next_state <= LOW_TO_HIGH; end if; data_out <= '1'; when HIGH_TO_LOW => next_state <= IDLE; data_out <= '0'; when LOW_TO_HIGH => next_state <= IDLE; data_out <= '0'; end case; end process; end Behavioral; ``` 这个简化的VHDL模块描述了一个曼彻斯特编码器的基本逻辑。实际应用中，可能需要考虑更复杂的情况，如边沿检测、数据同步以及错误检测等。在CPLD开发过程中，我们可以将这个编码器模块与其他逻辑块结合，例如数据包处理器和串行接口，以实现完整的通信系统。在“daima.rar”压缩包中，提供的“曼彻斯特编码”文件可能是详细的VHDL代码示例，或者是关于如何在实际项目中使用曼彻斯特编码的指南。这些资源可以帮助你更好地理解和实现曼彻斯特编码在CPLD中的应用。通过学习和实践，你可以掌握这一重要的数字通信技术，为你的电子设计项目增添可靠的数据传输能力。

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daima.rar （8个子文件）

曼彻斯特编码

med.v 1KB

readme.doc 24KB

me_tf.v 1KB

me.v 3KB

md_tf.v 2KB

help.txt 218B

md.v 3KB

readme.txt 4KB

******************************************************************************************************************************************** Readme File for Manchester Encoder - Decoder for Xilinx CPLDs Customer Pack Created: 4/12/00 ******************************************************************************************************************************************** ******************************************************************************************************************************************** DISCLAIMER ******************************************************************************************************************************************** THIS DESIGN IS PROVIDED TO YOU "AS IS". XILINX MAKES AND YOU RECEIVE NO WARRANTIES OR CONDITIONS, EXPRESS, IMPLIED, STATUTORY OR OTHERWISE, AND XILINX SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR A PARTICULAR PURPOSE. This design has not been verified on hardware (as opposed to simulations), and it should be used only as an example design, not as a fully functional core. XILINX does not warrant the performance, functionality, or operation of this Design will meet your requirements, or that the operation of the Design will be uninterrupted or error free, or that defects in the Design will be corrected. Furthermore, XILINX does not warrant or make any representations regarding use or the results of the use of the Design in terms of correctness, accuracy, reliability or otherwise. ******************************************************************************************************************************************** File Contents ******************************************************************************************************************************************** This zip file contains the following folders: \Verilog_source -- Source Verilog files: med.v - top level file me.v - Verilog encoder portion md.v - Verilog decoder portion \Verilog_testfixture -- Verilog Testbench files. This files only include the testbench behavior, they do not instantiate the DUT. This can easily be done in a top-level VHDL file or a schematic. This folder contains the following files: md_tf.v -- Test fixture for md.v. me_tf.v -- Test fixture for me.v. This design is targeted to the XCR3064XL-7VQ100C CoolRunner CPLD. This is a 3V, 64 macrocell device in a 100 VQFP package. The fitter was allowed to pick the pin-out for the device. Please also note that this design has been verified through simulations, but not on actual hardware. ******************************************************************************************************************************************** Technical Support ******************************************************************************************************************************************** Technical support for this design and any other CoolRunner CPLD issues can be obtained as follows: North American Support (Mon,Tues,Wed,Fri 6:30am-5pm Thr 6:30am - 4:00pm Pacific Standard Time) Hotline: 1-800-255-7778 or (408) 879-5199 Fax: (408) 879-4442 Email: hotline@xilinx.com United Kingdom Support (Mon,Tues,Wed,Thr 9:00am-12:00pm, 1:00-5:30pm Fri 9:00am-12:00pm, 1:00-3:30pm) Hotline: +44 1932 820821 Fax: +44 1932 828522 Email : ukhelp@xilinx.com France Support (Mon,Tues,Wed,Thr,Fri 9:30am-12:30pm, 2:00-5:30pm) Hotline: +33 1 3463 0100 Fax: +33 1 3463 0959 Email : frhelp@xilinx.com Germany Support (Mon,Tues,Wed,Thr 8:00am-12:00pm, 1:00-5:00pm, Fri 8:00am-12:00pm, 1:00pm-3:00pm) Hotline: +49 89 991 54930 Fax: +49 89 904 4748 Email : dlhelp@xilinx.com Japan Support (Mon,Tues,Thu,Fri 9:00am -5:00pm () Wed 9:00am -4:00pm) Hotline: (81)3-3297-9163 Fax:: (81)3-3297-0067 Email: jhotline@xilinx.com

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