Refer to Table 56. SDR50/SDR104 Interface Timing Specification in IMX6DQAEC_Rev.3.
It was described "SD5 uSDHC Output Delay".
Next, refer to Figure 47. SDR50/SDR104 Timing.
I think that "SD4" is correct allow because parameter name is "uSDHC Output Delay".
Please check it.