DP83826E: DP82826 Data Lost Issue

Hi Ning,

Please clarify the problem. Sharing a block diagram with the intended data path and providing text-searchable PDFs of schematics will help us debug and advise.

Thank you,

Evan

Dear Evan,

I have talk with customer,they prepare the schmatic and block diagram,once I receive those,will send to you soon.

Thanks

Dear Evan,

1.Pls kindly find the attach file for serchable schematics,software is AD.

2.Block diagram pls find the attachfile.

3.The test dta is via windows command,ping Ethernet packet, 1024 bytes  length.

Thanks

03 ETHERNET DP83826E.SchDoc

Hi Ning,

Thank you for the documents, I will take some time to review.

Ning Li said:

then find DP83826E have data lost,and in the same net,the data of other device is correct

Could you be more specific with this issue? Does the other device refer to the MCU, or another PHY?

Thanks again,

Evan

Dear Evan,

Sorry,the other device is another PHY.Attach file is the data,pls kindly help to review.

Thanks

Hi Ning,

Ning Li said:

Customer feedback When they do the fuction test,then find DP83826E have data lost,and in the same net,the data of other device is correct,

Please share a register dump from addresses 0 to 1E during the quoted case.

Thank you,

Evan

Dear Evan,

Pls kindly find attach file for 0 to 1E Data.

Thanks

0-1E Data.docx

Hi Ning,

Is this the register dump for the PHY with correct data, or the PHY with data lost? Please share register dumps for both PHYs.

Is the design&layout for the two PHYs identical? If so, the issue may be on the MDI side.

Thank you,

Evan

Dear Evan,

The data  is the register data of DP83826 with packet loss just a short time after power-on. At present, there are three prototypes with high packet loss when use DP83826, and no normal ones can be compared.

AS the covid19,the several prototypes will be made for comparison after the engineers come back to work after the epidemic is unsealed, and then we will give the comparative data.

For layout,DP83826 is the same.

Thanks

Hi Ning,

Thank you for the clarifying information. In the meantime while waiting for the comparative data, are you able to share the schematic & layout for review?

Regards,

Evan

Dear Evan,

I have send to you before.Pls kindly find attach file for schematic .Pcb layout i will provide later.

Thanks

0363.03 ETHERNET DP83826E.SchDoc0871.DP83826E.pdf

MSC3020-GZSJ REV.B V4.0 220926.PcbDoc

Dear Evan,

Pls kindly find attach file for PCB Layout.

Thanks

Hi Ning,

Thank you for providing PCB and schematic files. The schematic and layout look good to me, but I will review again after more context on the issue is provided (register data or otherwise).

Thank you,

Evan

Dear Evan,

Sorry,I forget the regisiter data,pls kindly find attachfile.

Thanks

Pls kindly find 1513.0-1E Data.docx

Hi Ning,

Is there a purpose to the 1kΩ resistor in series with XO? Please see if the issue can be reproduced while shorting across it.

Thanks,

Evan