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SN65LV1224B loosing data

Ersin OEZALP
Prodigy 40 points
Other Parts Discussed in Thread: SN65LV1224B, SN65LV1023A

Hello,


I use SN65LV1023A serializer and SN65LV1224B deserializer on two PCBs. Both ICs are connected with each other over optical cable (1.25 Gbps) with SFP connectors. Reference clock is 50 MHz on both sides.

I lock using 1111100000 patterns successfully. I use the same pattern when the line is idle. Data transmission is also good. However sometimes some data is sent wrong or lost. This happens very rarely, sometimes once a week.


In the datasheet it is written:

"Notice that the RMT pattern only affects the deserializer lock time, and once the deserializer is in lock,
the RMT pattern does not affect the deserializer state as long as the same data boundary happens each cycle."

Does this mean that the error is not related with my data pattern?


Where can be the error?

Regards,

Ersin ÖZALP

  • 0
    TI__Mastermind 20820 points

    Hi Ersin,

    Once lock is received between the SN65LV1023A and SN65LV1224B the transmitted data can not effect the byte boundary or lock.

    Your problem may be associated with jitter between the transmitter and receiver or since we are AC coupled (SFP+ is typically AC coupled)  longs runs of 1's or 0's in the data may be causing the receiver to get bit errors. I think the later is the less likely culprit though but we should still consider it. Have you ever measured the amount of jitter that is present between the transmitter and receiver? If you are close to the maximum aloud value of jitter this can cause your link to be marginal and possibly drop bits from time to time.