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这颗芯片有两块EVM，一个是SGMII接口一个是RGMII接口，从硬件上来看我没有找到太大的不同点，请问下SGMII接口的EVM如何上电之后就是SGMII接口，是出厂时更改芯片寄存器了吗？还是这个芯片有两个版本的？谢谢!
