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LS1046A RGMII 125MHz clock rising/falling time issue

Question asked by Chen Jacky on Sep 18, 2018
Latest reply on Oct 23, 2018 by Chen Jacky

RGMII 125MHz(ECn_GTX_CLK125) clock rising/falling time are fail. We tried to remove LS1046A and add dummy load to measure timing that can meet spec. our design is 2.5V.

LS1046A RGMII AC timing specifications (LVDD = 2.5 /1.8 V)

Rise time (20%-80%) tRGTR — — 0.75 ns
Fall time (20%-80%) tRGTF — — 0.75 ns

Our measuement result:

Can we remove LS1046A to measure timing or do you have any comment?

Thanks.

2018/9/19

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