基于SOPC的嵌入式串口 网络协议转换器的设计和实现-物理电子学专业论文.docxVIP

ABSTRACT Serial communication, as currently the most widely used data communications, has a few advantages such as simple to realize and has stability performance, however, there are some limitations of Serial communication, mainly short distance and low rate transmission, making it applies only to the short distance between the local devices and the communications of less transmission rate demanding. so, how to improve the serial transmission rate and transmission distance without changing the serial port characteristics, becomes a problem urgently to be solved. Internet provides a solution. Computer network provides a great platform for data communications. Its high data rate and wide range of transmission has far exceeded peoples imagination. If the serial device can access the internet, using the internet to transmit serial data, then the limitations of serial communication can be resolved. In this case, the serial - Network protocol converter appears. After introducing the background, this article analyzes the current development of serial port - Network protocol converter, and on this basis, raises an embedded serial port - network protocol converter novel based on SOPC (system on a programmable chip). Compared with the common products available in the market , SOPC-based is cutability, the system can be added or deleted according to the performance needs and price budget, which can greatly increases system flexibility. The novel introduces SOPC-based Embedded Serial - Network protocol converter from the overall design, hardware design, operating system and driver design, and application layer software design. Chapter II gives the overall design, including functions requirements and specifications, the port connector and the overall program; The third chapter is the detailed design of the hardware, given the detailed design of each module, including the Nios II soft-core processor module , The network module, serial module, power crystal, and JTAG debug modul