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AD9154 SYNC status is low

hello, I bought a  AD9154-FMC-EBZ board and used in ADS7-V2EBZ. Refer to, the ACE softwave  works  correctly and the JESD PLL  has been locked .But the DPGDownloder softwave  has some  problem, the sync status  is always low .what happened?  I'm looking forward to your reply.