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ADC12DJ5200RF: SerDes rates when using JMODE 30

Part Number: ADC12DJ5200RF

using own board with 8 lane configuration and JMODE 30. The clock to the device is at 5.12 GHz and the expected SerDes rate is 16.896 Gbits/Sec.

is this correct?

the receiver in the FPGA is unable to find the 64b/66b header.

i have tried with a reduced sample rate of 3.9 GHz and Serdes rate of 12.87 Gbits/Sec and with the same results.

the data sheets does not give a direct equation for the serial rate.

could anyone who has successfully used this mode help please?