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Ethernet PHY is not working with 2017 Date code IC's

Gonugunta Harshavardhan reddy
Prodigy 230 points
Part Number: 88E1518


Hi ,

We are using 88E1518 in one of our design. 

In Frist production slot of 100 Boards are assembled with Date code of 2014 and boards are working fine [When we do ping 0% packet loss ]without any issue.

in Second production slot of 50 boards are assembled with Date code of 2017 and all boards are giving inconsistent results [When we do ping , it works fine for 2-3 mins after than packet loss increased to >50%]

Please let us know is there any recommended Other setting need to be done for 2017 date Code IC's??

FYI: Driver configurations, ETHERNET PHY settings and Board manufacturer is same for First and Second slots.

Any help to resolve this issue is highly appreciated. 

Thanks,

Harshavardhan.