DP83TC811R-Q1: DP83TC811R-Q1 100 BASE-T1 Transmitter Power Spectral Density (ps)

Kung Poyuan

Prodigy 241 points

Part Number: DP83TC811R-Q1
Other Parts Discussed in Thread: DP83TC811

Tool/software:

I configured the DP83TC811 to Test Mode 5 according to document snla276 for Transmitter Power Spectral Density

The result was a failure. Can I adjust the registers to fix it

over 1 year ago

0 Melissa Chang over 1 year ago

TI__Genius 14006 points

Hi Kung,

You should also follow SNLA293: https://www.ti.com/lit/an/snla293/snla293.pdf?ts=1718399220027&ref_url=https%253A%252F%252Fwww.google.com%252F

Can you confirm you are also programming the correct registers mentioned in the section ' 3 Software Configuration' of the above document?

Are you using extended register writes?

Best regards,

Melissa

0 Kung Poyuan over 1 year ago in reply to Melissa Chang

Prodigy 241 points

snla276.pdf

0 Melissa Chang over 1 year ago in reply to Kung Poyuan

TI__Genius 14006 points

Hi Kung,

Thank you for attaching SNLA276, this document has the correct registers for test modes. Can you confirm you are also programming the initialization registers (using extended register writes) mentioned in section 3 of SNLA293? This is required to pass Compliance aswell.

Best regards,

Melissa

0 Kung Poyuan over 1 year ago in reply to Melissa Chang

Prodigy 241 points

After modify the DP83TC811 register (Line Driver Control 0X0400) as below from 45.6 ohm(default) to 34.4 ohm,fail item change to PASS.

Interface

Interface forum

DP83TC811R-Q1: DP83TC811R-Q1 100 BASE-T1 Transmitter Power Spectral Density (ps)