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F1C200S ddr REF 处分压作用是干什么的？目前为止 我的板子有了固件 但是跑不起来，分压电阻用的2K ;DRAM=2.5V 谢谢各位大佬，比较急
ddr都有个VREF参考，电压就是1/2的VCC_DRAM。 可参考已量产的R3对比下原理图，重点检查电源、晶振、复位等地方。 https://mangopi.org/tiny200