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AM335X中高速信号部分，比如ddr，RGMII，usb等对于阻抗的要求以及layout guide有没有规定要求呢？谢谢
你好！关于DDR的layout要求，可以参考AM335X DATASHEET的如下章节
5.6.2 mDDR(LPDDR), DDR2, DDR3, DDR3L Memory Interface，其中有Routing Guidelines
