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PCIE GEN3眼图测试 RMS jitter fail (sn75lvpe802 )

Other Parts Discussed in Thread: SN75LVPE802

.U.2-1  without redriver :眼图测试PCIE GEN3 RMS jitter fail,lan0-lan3 all fail,3.2~3.6ps,走线较短,intel SPEC要求小于3ps

 U.2-2  with redriver :眼图测试PCIE GEN3 RMS jitter fail,lan0-lan3 all fail,3.7~4.2ps,走线较长

2.PCIE  GEN3 clock test:关于jitter 部分测试pass

3.用测试pass 的PCIE X4 与U.2 做clock 、date 眼图测试 交叉验证:

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

4.调节DEW,DE,EQ,眼图有变化, RMS jitter still fail

帮忙看下RMS jitter fail与date之间的关系,谢谢!