DP83TC811R-Q1: test mode4 transmission distortion exceeded expectations

Amy Luo

Part Number: DP83TC811R-Q1

Hi team,

One of our customer's issues, I'm forwarding it below, could you please provide some troubleshooting suggestions

The transmission distortion test fail, the values are as shown in the figure below, layout is as follows, what are the possible causes? Could it be improved?

Best Regards,

Amy Luo

over 2 years ago

0 Alvaro (Al-vuh-roe) Reyes over 2 years ago

TI__Mastermind 19621 points

Hi Amy,

The values are very off something may be wrong in setup. Kindly consult test equipment vendor for possible correction.

For our PHY check that the registers are being programmed correctly. You can confirm that by reading back the registers to confirm their values.

Regards,

Alvaro

0 Amy Luo over 2 years ago in reply to Alvaro (Al-vuh-roe) Reyes

TI__Expert 6895 points

Hi Alvaro,

Thanks for your response. The following is customer feedback:

Attached is the setup and the PHY PCB layers layout of the test mode4 test. Help to see if there is a problem. Which register values of the PHY need to be confirmed?

test mode4 setup.rar

PHY Layout.rar

Regards,

Amy