驱动SDRAM的时序比较的麻烦一些，不像驱动SRAM，非常简单，网上搜索一下，估计有非常多的FPGA驱动SDRAM的资料，而且是各种的给你讲时序问题，不懂SDRAM为何物的，一定要看看。(The timing comparison of driving SDRAM is rather troublesome. Unlike driving SRAM, it is very simple. Searching online, it is estimated that there are quite