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AM6442: CPSW 仅支持RMII 以及 RGMII，为何在 TRM手册 CPSW模块的寄存器中 仅找到GMII_EN 以及 XGMII_EN 字段，而找不到RMII_EN字段？

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Intellectual 340 points
Part Number: AM6442

TRM手册版本：

检索遍历不到RMII_EN字段，仅有GMII_EN 以及 XGMII_EN（AM6442 仅支持 RMII  RGMII），这两个字段并不属于AM6442 CPSW的接口支持范围。 

bit7 GIG字段，如何确保RMII工作在100mode?