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SN75DP130: unbalance eye between different lanes

Tess Chen
Intellectual 2675 points
Part Number: SN75DP130

Hi Team,

We' using SN75DP130 and  ITE factory debug found that the eye diagram of the DP130 output is unbalanced for 4 lanes, they are targeting lane0 for other lanes.

Eyes figures are as shown in two screenshot below.

Lane0 swing voltage  is 1.056V whereas lane1/2/3 are about 1.2V. 

Questions:

Could you please guide us for improvements?

Best Regards,

Tess Chen

  • +1
    TI__Guru**** 177676 points

    Tess

    Are they programming lane 0, 1, 2, and 3 with the same SWING level? 

    If the lanes are programmed with the same level, the part to part, PCB design/manufacture, component on the DP130 variation will all contribute to the lane to lane difference. There is no individual lane tuning in the DP130. The important thing is are they passing the DP compliance?

    Thanks

    David