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DM8148配置DDR3自刷新不成功



现在使用的DDR3型号是MT41K128M16。

我按文档配置0x4c000038寄存器的LP_MODE=2,SR_TIM=0,应该在写入后,DDR3就进入自刷新状态了。

但测量CKE信号仍为1.2V