Simulation And Implementation Of CICQ Architecture In The Fabric Channel Switch

With the rapid development of information technology, especially the boom of data services and multimedia-based business, switching equipment have become highly demanded for the sharp increase in network traffic. Fiber Channel(FC),characterized by high-performance, highly reliable data transmission, is widely used in various fields. Fiber Channel switches, as a network relay device, is now a key research direction.This paper describes the present situation of the development of Fiber Channel switches, and then analyze the composition of Fiber Channel switches. Switching fabric, as the core part, is responsible for matching the input data to the output of the network,.The switching fabric and scheduling algorithms determine the performance of the switch. With the continuous progress of the hardware technology, the CICQ structure with the cross point buffer has become a hot research topic in the present study, with its good performance and simple scheduling. The crossbar with buffered caches and the distributed scheduling can be used to realize variable-length data exchange. The variable-size multipacket segmentation strategy is chosen in this work for the rational use of the switch fabric and the best efficiency.In order to estimate the performance of the switch structure, the OPNET is used to completed CICQ structure, with RR-LQD scheduling algorithm and variable-size multipacket segmentation strategy. After modeling, new nodes is added to simulate the switch fabric, to make a preliminary analysis of the CICQ structure, scheduling algorithm and segmentation strategy, which provides the basis for the latter design of the overall hardware.Then a switch fabric is designed based on Verilog hardware language, according to the Top-down design approach. Firstly, we analyze the architecture of the whole system. Then in order to facilitate internal data transmission and processing, we define the internal packet format and the data format interactive with line card. Thirdly, we design the switch in three parts, input buffer with input scheduling unit, crossbar buffer with output scheduling unit and output buffer whit control unit. Finally the ModelSim software is used to simulate the switch fabric.Finally, the switch fabric is tested in verification platform to evaluate the performance, and verify the correctness of the design at the same time.