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
Hi Andrei,
We have measured the NXP-LS1046ARDB that has same issue.
The LS1046ARDB is 1.8V RGMII, so Rising/Falling Time value exceeds 0.54 ns
To measureEC1_CLK125_OUT (from PHY RTL8211FS)
EC1_CLK125_OUT
Rising Time value is 740.40ps => Fail
Falling Time value is 662.89ps => Fail
do you have any comment?
Thanks.
2018/10/23