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C6657 PCIe速率低-设置lanes失败



你好!CMD_STATUS[LTSSM_EN] =0之后设置寄存器PL_GEN2 的DIR_SPD为1后,实际上读出PL_GEN2 一直是0x0000020F这个值,DIR_SPD这个位写不进去,为什么,请问要怎么设置这个寄存器?

附相关的寄存器:

           PL_LINK_CTRL:0x30120

           LINK_CAP:0x35422

           LINK_CTRL:0x2

           PL_GEN2:0x20F