| This thesis gives emphasis on the design of VXI-Bus Serial Controller Module. The project is developed to realize the high-speed and high-performance of the auto-test system of VXI-bus. As the kernel of VXI-Bus auto-test system, the module is not only the commander of VXI-Bus auto-test system, but also the resource managerment of the system, VXI-Bus Serial Controller Module determined the performance and stability of the system significantly.Based on study of the VME, VXI, USB Specification, serial communication and controller technic with comprehensive compaing the popular serial bus, we select the Universal Serial Bus as the main communication interface between computer and this controller. Then the theory and implement method of VXI-Bus Serial Controller Module are specially analyzed.During the design of VXI-bus Serial Controller Module, the functions of VXI-bus including time-sequence for VXI interface, resource management, interrupt process, bus arbitration, are accomplished. To advance the performance and stability, the FPGA technic is used to implement the kerneled code including serial bus time-sequence switching to VXI interface time-sequence, the UART, the Parameterized Baud Generator and"Pipeling frame". The handle type of Data Transfer Bus for VXI-bus is researched thoroughly, and the format of serial data transfer is designed.After showing the software Architecture of the system, the design flow and method of USB frame and USB driver are explained detailedly. On the basis of HIT-VISA and resource managerment, the new resource managerment according to the serial coding style is designed; at last the standard functions of the VISA library for USB interface is given.The actual test and experimental results show that the theoretical analysis of this design is correct, the design is reasonable and all technical qualification is satisfied with the requirements of the design. |
