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LMH0397: Interference between different boards

Rock Su
Intellectual 2220 points
Part Number: LMH0397

Dear colleague,

Our customer has below the design:

There are some strange phenomena.

Board 1,2,3,4 are independent power supply. 

For example, board 2 is working, at this time, board 1 start power-up.

Then board 2 lost 4 or 5 packets, every packet has 1536bits data.

Could you please give us some suggestions to debug this issue?

Thanks a lot! 

  • 0
    TI__Guru* 88885 points

    Hi Rock,

    I thought i responded to this case yesterday. This is what i noted.

    Please look at the power to make sure when powering board 1 there is no glitch on supply of board 2.

    Additionally you can look at if there is any cross coupling between board high speed traces between board 1 & 2.

    Are these two boards sharing control signals? make sure these are isolated as well.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    TI__Intellectual 2220 points

    Hi Nasser,

    Thanks for your reply!

    Customer says:

    1. There are no glitch on power.

    2. These board are independent of each other. In reality, these board will be inserted to a main platform, customer demand is when you insert someone board, other board data should not be influenced.

    So what should we do in next step?

    Regards, 

    Rock

  • 0 in reply to Rock Su
    TI__Guru* 88885 points

    Hi Rock,

    In this design, it seems when they plug in one board it affects other boards which are already plugged in.  Our initial guess was that perhaps power is getting disrupted. Or maybe there is some signal cross coupling. Or perhaps one of the control signals are affected causing device to produce bit error. However, i cannot think of another reason that may cause this sudden burst of error. For sure, it seems device under test is getting affetec by insertion of this other board. Now we need to find out what is causing this.

    Regards,, Nasser