DP83867CS: DP83867CS PHY is not able auto-negotiate with Laptop or PC

Aman,

Let me consult with our team/resources regarding this. I will have a more concrete response for you tomorrow afternoon.

Sincerely,

Jason Lee

Aman,

Can you verify the PC link? Also, have you tried a different link partner (other than PC and Ethernet PHY?) Furthermore, is auto negotiation enabled on PC?

Sincerely,

Jason Lee

Dear Jason,

I tried to establish a link with a 1G Ethernet Analyzer also. In this case, neither PHY nor Ethernet Analyzer is getting link partner capabilities.

In all three setups, Auto-negotiation was enabled at PHY and at the PC/Laptop or Ethernet Analyzer.

Sincerely,

Aman

Aman,

Could you clarify your three setups? From the information given, I am seeing that PHY-to-PC & PHY-to-Analyzer are not working, while PHY-to-PHY is working. Is this correct? Have you tried PC-to-Analyzer?

Furthermore, are you writing/configuring to PHY registers after bootup?

From the information given, we are leaning towards the notion that the link partner is the issue, not the PHY itself.

Sincerely,

Jason Lee

Dear Jason,

Yes PHY to PHY is able to auto-negotiate & PHY to PC & PHY to Analyzer are not working.

Also, the PC to Analyzer is working. So we are not doubting the link partner. 

We are not writing any register after bootup.

Sincerely,

Aman

Aman,

I investigated this query with the team and it seems like the PHY gigabit capability is somehow disabled. Do you recall changing this at all? This is most likely causing issues due to the PC/link partner used is only capable of gigabit. Could you try another PHY with this link partner to confirm?

Sincerely,

Jason Lee

Dear Jason,

I investigated with my software team as well they are not configuring any PHY register and it is getting booted with strap settings only. If you want I can share the PHY schematic after discussing internally.

Sincerely,

Aman Banolia

.Aman,

Yes, please share relevant schematics and I can do a schematic review and return within 5 business days.

Sincerely,

Jason Lee

Dear Jason, 

Attaching our schematic designed for RGMII, auto-neg enables full duplex speed support 10/100/1000 Mbps.

DP83867 Schematic

Sincerely,

Aman

Aman,

Can you please send a pdf file instead of a Google Drive link? Thanks!

Sincerely,

Jason Lee

Dear Jason,

Find attached link to the PDF schematic.

DP83867 Schematic

Sincerely,

Aman

Aman,

In the meantime, while we are taking a look, please fill out the customer portion of the attached schematic checklist. Thank you!

7024.DP83867_Schematic_Design_Review_Checklist.xlsx

Sincerely,

Jason Lee

Dear Jason, 

Did you get something in the schematic that can resolve our issue?

Also attached the design review checklist for your reference.

7024.DP83867_Schematic_Design_Review_Checklist

Aman,

Jason is looking into this further with the team and will get back to you.

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Regards,

Vikram

Aman,

At earliest convenience, please send over the original file type version. Sending GoogleDoc file types requires me to acquire temporary access, which significantly delays our ability to support this query. In the meantime, I will go through this checklist and return it to you shortly. Thanks!

Sincerely,

Jason Lee