远程USB光纤传输系统的研究与设计
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摘要
通用串行总线(USB)是一种新兴的计算机外围通信接口标准,随着计算机技术和数字技术的迅猛发展,以及USB 2.0、USB OTG的推出,USB技术的应用日益广泛。USB具有灵活、方便、应用范围广、通信稳定、成本低廉等优点,已成为当前计算机必备的接口。但是其单段电缆几米、多级串联几十米的传输距离,始终是限制其应用范围进一步拓展的巨大障碍。因此,远程USB传输系统的开发具有重要意义。
本文提出了一种利用光纤实现USB信号远距离透明传输的方案。它支持USB全速传输,在本地的主机一侧和远端的设备一侧分别添加一个光收发端机,中间通过一对单模光纤进行连接。本文对系统的硬件电路和FPGA内核编程作了详细介绍,给出了各部分的电路原理图、Verilog核心代码和调试结果,对系统调试和运行中出现的问题进行了分析,给出了解决问题和排除故障的方案。文末还对高速远程USB传输系统的设计提出了建议,并提出了后续工作的目标。
Universal Serial Bus (USB) is a newly-emerged computer peripheral communication interface standard. With the rapid development of computer and digital technology, and the evolution of USB 2.0 and USB OTG Specifications, the USB technology is becoming more widely used than ever before. USB has the advantage of flexibility, convenience, stability, broad application, and low cost. It has become a standard interface of computer nowadays. However, the transmission distance of USB is restricted to several meters on a single cable, and at most tens of meters even cascaded, which is a main obstacle that confines its application. Therefore it becomes significant to development a remote USB transmission system.
This thesis provides a solution that utilizes optical fiber to transparently transmit USB signals. It supports full-speed remote USB transmission by adding a pair of optical transceivers on both sides of local host and remote device, which are linked by a pair of single-mode optical fiber. The hardware designing and software programming are introduced in detail. Circuit scheme for each part of the system, kernel codes in Verilog HDL, and debugging results are provided. Malfunctions and failures during the debugging and running periods are analyzed, and solutions to existing problems are presented. Suggestions to the upcoming work, which will support high-speed USB transmission, are given in the end.
本文提出了一种利用光纤实现USB信号远距离透明传输的方案。它支持USB全速传输,在本地的主机一侧和远端的设备一侧分别添加一个光收发端机,中间通过一对单模光纤进行连接。本文对系统的硬件电路和FPGA内核编程作了详细介绍,给出了各部分的电路原理图、Verilog核心代码和调试结果,对系统调试和运行中出现的问题进行了分析,给出了解决问题和排除故障的方案。文末还对高速远程USB传输系统的设计提出了建议,并提出了后续工作的目标。
Universal Serial Bus (USB) is a newly-emerged computer peripheral communication interface standard. With the rapid development of computer and digital technology, and the evolution of USB 2.0 and USB OTG Specifications, the USB technology is becoming more widely used than ever before. USB has the advantage of flexibility, convenience, stability, broad application, and low cost. It has become a standard interface of computer nowadays. However, the transmission distance of USB is restricted to several meters on a single cable, and at most tens of meters even cascaded, which is a main obstacle that confines its application. Therefore it becomes significant to development a remote USB transmission system.
This thesis provides a solution that utilizes optical fiber to transparently transmit USB signals. It supports full-speed remote USB transmission by adding a pair of optical transceivers on both sides of local host and remote device, which are linked by a pair of single-mode optical fiber. The hardware designing and software programming are introduced in detail. Circuit scheme for each part of the system, kernel codes in Verilog HDL, and debugging results are provided. Malfunctions and failures during the debugging and running periods are analyzed, and solutions to existing problems are presented. Suggestions to the upcoming work, which will support high-speed USB transmission, are given in the end.
引文
[1]肖踞雄等编著,USB技术及其应用设计,北京:清华大学出版社,2003.11
[2]周立功等编著,USB 2.0与OTG规范及开发指南,北京:北京航空航天大学出版社,2004.9
[3]李忠,远程USB波分复用光纤通信系统研究与设计,上海交通大学硕士学位论文,2005
[4]张志远,一种USB延长器的研究与设计,西南交通大学硕士学位论文,2004
[5] USB技术规范Universal Serial Bus Specification(Revision 2.0),2000.4
[6] USB官方网站http://www.usb.org/
[7] CATC Chief参考资料http://www.catc.com/
[8] Maxim公司网站http://www.maxim-ic.com/
[9]深圳飞通光电子技术有限公司网站http://www.photontec.com/
[10] Altera公司网站http://www.altera.com/
[11] Open Cores网站http://www.opencores.org/
[12]孟翔鹭李新碗卢加林吴龟灵陈建平,远程USB光纤传输系统远端设备工作性能分析,广西:光通信技术,2005年第12期
[13]孟翔鹭卢加林李新碗周俊鹤王义平张晓红陈建平,远程USB光端机中的事务处理分析,上海光通信2004年论坛
[2]周立功等编著,USB 2.0与OTG规范及开发指南,北京:北京航空航天大学出版社,2004.9
[3]李忠,远程USB波分复用光纤通信系统研究与设计,上海交通大学硕士学位论文,2005
[4]张志远,一种USB延长器的研究与设计,西南交通大学硕士学位论文,2004
[5] USB技术规范Universal Serial Bus Specification(Revision 2.0),2000.4
[6] USB官方网站http://www.usb.org/
[7] CATC Chief参考资料http://www.catc.com/
[8] Maxim公司网站http://www.maxim-ic.com/
[9]深圳飞通光电子技术有限公司网站http://www.photontec.com/
[10] Altera公司网站http://www.altera.com/
[11] Open Cores网站http://www.opencores.org/
[12]孟翔鹭李新碗卢加林吴龟灵陈建平,远程USB光纤传输系统远端设备工作性能分析,广西:光通信技术,2005年第12期
[13]孟翔鹭卢加林李新碗周俊鹤王义平张晓红陈建平,远程USB光端机中的事务处理分析,上海光通信2004年论坛