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请问6678的SGMII接口能否不通过外部的PHY芯片直接连接到光模块？
如果可以的话，应该如何进行配置？我看到数据手册上SGMII的连接方式总共有：和PHY连接， 自协商互联和强制连接。应该采用哪种方式？
6678 SGMII不支持1000BASE-x,所以不支持直接接光模块
