We design a simple SDRAM controller in FPGA to interface with SDRAM, its main tasks are initialization, periodic refreshing, continuous reading and writing.

并在FPGA中实现了一个简化的SDRAM控制器，用以完成对SDRAM的初始化、定时刷新、连续读写等功能。

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While its time sequence and access mechanisms are very complex, it is necessary to design SDRAM controller to improve the efficiency of accessing.

但SDRAM的控制时序和机制较复杂，因此需要设计sdram控制器以提高其读写效率。

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The design scheme which USES FPGA as the main controller is presented in detail, including the internal interface of SDRAM, process of data transmission and realization of ping-pong operation.

详细介绍了以FPGA为主控器的设计方案，包括SDRAM内部接口设计、数据传输过程以及乒乓操作的实现方法。

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