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Original question:

DP83869HM: DP83869HMRGZR - Schematic check and advise regards grounding issue with ethernet

DP83869HM: DP83869HMRGZR - 1% TX error issue

Amit Perry
Prodigy 50 points
Part Number: DP83869HM


Tool/software:

Hey 

Following this post:
https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1459668/dp83869hm-dp83869hmrgzr---schematic-check-and-advise-regards-grounding-issue-with-ethernet

we are now testing the board and we come across a problem 

there are up to 1% TX error 

but 0% errors on the RX side.

working with SGMII to MDI only 100/10 with magnetics.

we test it with IPERF 

i will attach some photos 

kindly help with what we can do 

1. already replaced the magnetics with another

2. fixed all the previous issues from the previous post 

we have tested 4 units 

Thanks 

Amit P

  • 0
    TI__Mastermind 21426 points

    Hi Amit, 

    Could we look at the updated schematic?

    Also, if possible, could you put the PHY into loopback mode and do an external loopback test to see if there are no errors between the MAC and the PHY?

    Please refer to the datasheet section 7.3.4 for more information on the loopback test. External loopback test should flag any packet loss issue from the MAC to the PHY to the RJ45 connector. 

    Please let me know. 

    Best,
    J