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AM3352: RMII模式无法与PHY进行10M的通信

Part Number: AM3352


TI的AM3352走RMII的模式与PHY(YT8512)进行通信,100M时能通信,10M通信不成功,PHY这边抓到,AM3352发给PHY的数据都是错包,怀疑是PHY已经自协商成10M了,AM3352还在100M,AM3352是如何和PHY协商速率的?