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6678 88E1111 sgmii link不上

Other Parts Discussed in Thread: CDCM6208

做了一块板卡,硬件按照TI官网上的6678芯片 EVM设计的,网络一直link不上,DSP型号是C6678,PHY为88E1111,现在定位到是dsp和phy之间的sgmii通路不通,dsp做过sgmii和serdes回环测试,PHY做过了外回环测试,均正常,但是DSP到PHY的回环不正常,测过了PHY和dsp之间sgmii信号眼图,正常,MDIO读出的PHY寄存器的数据和EVM开发板读出来的数据一致。小弟已经完全没有思路了,求论坛里的大神为小弟指点迷津,非常感谢!