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DS90UB913A-Q1: with ub914 ,crc error ,ub914 not locked ,drop frame

Part Number: DS90UB913A-Q1

I am using a ub913 +ub914,  a host mcu was attached in 913 side . the pclk is 80M,the mode we select is  pclk as reference , the main problem is the the image in 914 side drop frame . at the beginning it was 30fps, if no movement ,then  the frame will drop to zero. if movement image , the frame will up again . and the lock pin of ub914 was low.  I read the register 0x0a,0x0b ,there were CRC err counts. at the beginning ,we thought something wrong with POC ,so we supply independent power to ub914 , but same situation .will you pls give some suggestion ?

Thanks