DP83TG720S-Q1: An error occurred in TEST_mode5 (Transmiter Power Spectral Density).

Hi,

I would like some clarification to make sure I understand correctly. By power do you mean MDI driver strength? 

Kind Regards,

Joe

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)

Hi、Joe

You're right.
Is there a way to increase the drive strength of MDI?

Hi,

What does the MDI path look like on your board?

Do you have any filtering on the MDI path or external ESD protection?

Kind Regards,

Joe

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)

HI, Joe

I am evaluating with the DP83TG720 Media Converter Evaluation Module made by TI.
Therefore, the MDI pass line is as follows and the ESD protection circuit is not installed.

Kind Regards.

Hi, Joe

Sorry for the late response.
I made the following settings and executed TEST-MODE5 again.

000D 001F
000E 0405
000D 401F
// 1200mV
000E 7800

The result was a little better than it was at the beginning, but it was still NG.
Is there any other countermeasure?

Kind Regards,

Hi,

I apologize for the late response I will reach out to the team to see what other countermeasures we have.

Kind Regards,

Joe

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)

Hi,

I would like to know how you are measuring the PSD. What scope and test fixture you are using?

Kind Regards,

Joe

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (www.ti.com/.../important-notice.shtml)

Hi, Joe

The equipment I am using is as follows.
Keysight: MXR254A
Keysight: AE6910T Automotive Ethernet Test App
Keysight: AE6943A
Keysight: AE6900R-105

By the way, as a result of testing PSD with the above set of measuring instruments on the evaluation boards of other manufacturers, it was confirmed that it was OK.

Kind Regards,

Hi,

I will get back to you by the end of business Friday. I will be measuring the PSD using our Tektronix scope and share the results with you.

Kind Regards,

Joe

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml)