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SN75LVPE802: PCIE GEN3 eye diagram test RMS jitter fail

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Part Number: SN75LVPE802

Hi team,

My customer has the following problems, which are described in Chinese. I am not familiar with eye diagram test. I translate the questions from Chinese to English. If there are descriptions that confuse you, please point out.

1、U.2-1  without redriver : eye diagram test PCIE GEN3 RMS jitter fail,lan0-lan3 all fail,3.2~3.6ps, Shorter route, Intel spec less than 3ps

U.2-2  with redriver : eye diagram test PCIE GEN3 RMS jitter fail,lan0-lan3 all fail,3.7~4.2ps, Longer route

2、PCIE  GEN3 clock test:About jitter part test pass

3、Use the PCIe X4 and U.2 that passed the test to cross verify the clock and date eye diagram test:

U.2 clock + PCIE X4 date: RMS jitter pass.2 date  + PCIE X4 clock: RMS jitter  fail

4、Adjust DEW,DE,EQ, eye diagram changes, RMS jitter still fail

Help to see the relationship between RMS jitter fail and date, thank you!

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Best Regards,
Amy Luo


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