基于FPGA的RS422异步串口(UART)转二线同步串口(SSI) 接口转换 UART转SSI UART转USART verilog完整工程

上传者: 27585925 | 上传时间: 2025-04-10 10:45:08 | 文件大小: 2.3MB | 文件类型: ZIP
PC端通过串口调试助手发送给异步串口接收模块UART_rx.v,完成串并解析后通过wire [7:0] pi_data ;wire pi_flag ;送入同步串口(SSI)发送模块usart_master.v。考虑到同步串口(SSI) 波特率是10Mbps,远大于异步串口波特率是115200bps,因此无需做数据缓存。同步串口参数如表1-1所示,异步串口参数如表1-2所示。开发工具Vivado 2018.3,使用Verilog HDL编写,FPGA器件xc7a100tfgg484。 在现代电子通信系统中,数据传输的接口标准多种多样,而异步串口(UART)和同步串口(SSI)是两种常见的串行通信接口。基于FPGA的RS422异步串口转二线同步串口(SSI)的接口转换工程,是一种利用现场可编程门阵列(FPGA)技术,将低速异步串口通信转换为高速同步串口通信的解决方案。通过这样的转换,可以实现不同通信标准之间的数据互通,对于提升设备的兼容性和扩展性具有重要意义。 在该工程中,使用了Verilog硬件描述语言来编写转换逻辑。Verilog是一种广泛应用于电子系统设计的硬件描述语言,它允许设计者通过文本形式描述数字电路的结构和行为,进而通过EDA工具实现电路设计的仿真和综合。工程中涉及到的关键Verilog文件包括UART接收模块 UART_rx.v 和SSI发送模块 usart_master.v。UART_rx.v 负责接收来自PC端通过串口调试助手发送的异步串口数据,进行串并转换,然后将数据通过特定的信号线pi_data和pi_flag发送给SSI发送模块。SSI发送模块则负责将这些数据通过同步串口发送出去。 在设计中,SSI接口被配置为高速模式,其波特率为10Mbps,而UART接口的波特率为115200bps。由于SSI接口的波特率远大于UART接口,因此在本设计中无需额外的数据缓存。这种速率差异的处理是通过硬件设计中的时序控制和数据流管理来实现的,确保在不丢失数据的前提下,实现快速而稳定的通信。 此外,整个工程是基于Xilinx的Vivado 2018.3开发环境进行开发的,使用的是FPGA器件xc7a100tfgg484。Vivado是一款功能强大的FPGA设计套件,它提供了从设计输入到设备配置的一整套解决方案,能够支持高层次的综合、仿真、时序分析、以及硬件配置等多个环节。xc7a100tfgg484则是Xilinx公司生产的一款Artix-7系列的FPGA器件,具有丰富的逻辑资源和I/O端口,适用于多种应用场景。 在该工程的设计文档中,通常会包括两个接口的参数说明表。表1-1中会详细描述SSI同步串口的工作参数,如波特率、数据位宽、停止位、校验位等,这些参数需要与外部设备的SSI接口参数相匹配。表1-2则会介绍UART异步串口的参数,包括传输速率、帧格式、流控等,这些参数需要与PC端的串口调试助手设置一致。通过这样的参数配置,可以确保数据能够在UART和SSI之间准确无误地传输。 整个工程的实现不仅展示了FPGA在接口转换方面的灵活性和高效性,还体现了在高速和低速通信系统之间进行数据交换时对精确时序控制的需求。此类型项目不仅对于通信系统设计者具有参考价值,对于深入理解FPGA在通信协议转换中的应用也十分有益。

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