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DS250DF810: "CDR Locked" always not shown

Part Number: DS250DF810

Hi Supporters:

 In DS250DF810EVM_SNLU180B guide file, I see that the Channel Indicators of CDR is Locked.  I use the half-active method of  one EV board used for TX and another one is used for RX. Now my system link and QSFP-DD cable assembly link all done and "Signal Detected" is green marked, but the red "CDR Unlocked" is always shown.

 I changed other setting items, but still not show "CDR locked". So could you please give some suggestions to me ? thanks a lot.