基于cpci光纤传输卡的设计与分析word格式论文.docxVIP

优秀毕业论文 精品参考文献资料 The Design of Optical Transmission Card Based on CPCI Abstract With the improvement of data acquisition system, it requires real-time transfer and process of large capacity data to ensure system real-time, stability and reliability. This thesis selects firm and compact CPCI as transfer interface and anti-interfered optical fiber as transfer medium to solve these two technical problems effectively by combining some key technical designs. The practical value is really very high. This thesis analyzes the task and develops design programme, including whole design and software and hardware design of board. Then detailed software and hardware design process are introduced. Boards design should focus on three key technical points which the hardware and software design will also concentrate on in the following: First, reliable VHDL inner logic mechanism. Hardware electrical circuit design includes PCI9054 bus port module, FPGA master module design, LVDS high-speed transfer module design and outer buffer module design. But it mainly emphasizes on FPGAs inner process mechanism to every module. In FPGA inner design, local bus target mode and DMA master mode are for low-speed data and high-speed data. To improve transfer reliability, logic adapts customed transfer protocol to encode and decode different data innerly. Second, PCB signal completeness analysis. PCB design adapts Allegro SPB for line length simulation, impedance matching simulation and parallel line simulation on PCB signal, through these simulations, signals latency, reflex and cross talk can be optimized so as to improve signal transfer completeness. Third, highly effective drive model architecture. In software design, we establish different drive models for three transfer mechanism of WDM (protocol control I/O, DMA(direct memory access), shared memory buffer area) and make corresponding system resources utilization rate tests for these models, then find the most effective drive model to improve