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C6657的开发板的PHY是88E1112，是1.2V和2.5V供电
现在电源种类已经够多了，0.75v, 1.0v, 1.5v, 1.8v, 3.3v, 5.0v
有没有1.8v供电的千兆以太网的PHY，请推荐一个. 谢谢！
原国半的dp83848应可以，我记得是单3V3的
dp83848是百兆PHY，国半的dp83865是千兆PHY，而且是1.8V供电，但MAC接口支持GMII, RGMII
但C6657的MAC支持SGMII，我理解得有没有问题？
