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DS250DF230: confirmed CDR Lock however BERT shows "Sync-Loss"

Guru 29690 points
Part Number: DS250DF230

Hi Team,

My customer designed their board and is evaluating DS250DF230 (Front-Port Ingress, Module-to-Host).

He confirmed CDR Lock (Channel Register Reg0x02=0xD8) however subsequent stage BERT shows "Sync-Loss" in this case.
If he set Channel Register Reg0xA5[7:5] from "001" to "000", he confirmed the issue doesn't occurred. 
Is it possible case?

On the other hand, he set Channel Register Reg0x3D[7] from "0" to "1" then confirmed the issue doesn't occurred when Reg0xA5[7:5]=001.
Should Reg0x3D[7] be set to "1"?

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Best Regards,