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板卡需要将C6678的SGMII接口连接到交换芯片BCM5396，因为SGMII接口一般来说是MAC和PHY之间的接口，如果我将BCM5396的模式设置为SGMII模式，然后和C6678的SGMII接口直接互联，不知道这样是否可行。BCM5396里面说SGMII模式下可以直接连接MAC芯片。
