Hi Hyoungrae,

Please confirm, is this the register script being used for this test?

Can the schematic & layout files be shared? Altium source is preferred if possible (email to e-mayhew@ti.com for private share)

Thank you,

Evan

Hi,

Yes, the register is correct.

The Scripts have been configured to make choices per pair.
We are using PADS, so we will send it to another file.

please check it

[Register]

writebuffer "---'1000 Base Test Mode 4("+#data+")'귩먠믦궢귏궥---^J^M"
call set_mii "0x001F", "0x8000" ;//Reset PHY
call set_mii "0x0009", "0x9B00" ;//Test Mode 4
call set_mii_ex "0x0025", #data ;//Single channel selection. It is important to change to appropriate channel under test
;//0400: Channel A
;//0420: Channel B
;//0440: Channel C
;//0460: Channel D
call set_mii "0x001F", "0x4000" ;//Restart PHY

Hi Hyoungrae,

Thanks for confirming, this script looks good.

We can move on to schematic, layout, and test setup verification.

Please share these details, either here or through email.

Thank you,

Evan

Hi,

I sent the circuit diagram by personal email. Did you receive it?

The equipment is RTP in R&S company.

We tested 10/100/1000Base-T.

Only distortion of 1000 base-t is FAIL.

Please check your personal mail.

Hi Hyoungrae,

I received the files, but the format cannot be opened in Altium.

I will look for alternatives to import the files, but in the meantime could you please check this layout checklist against your design:

https://www.ti.com/lit/zip/snlr048

Is the MDI trace layout following the recommendations in the checklist?

Please also share images of the MDI portion of schematic so I can verify.

Thank you,

Evan

Hi,

Please check your personal mail.

Hi Hyoungrae,

Thank you for sending, I will review and provide feedback tomorrow.

Regards,

Evan

Hi Hyoungrae,

Thank you for sharing schematic and layout snippets

I cannot find part number 48F-76NWZ2NL used in schematic, please confirm if it follows this MDI scheme:

It's challenging for me to verify if MDI layout is following requirements from the snippet shared, as I cannot measure or see dimensions.

Could you please check the MDI trace layout against the layout checklist I shared above? Please share any concerns about layout violation relative to checklist.

Thank you,

Evan

Hi,

Attached is the data you requested.(1000Base-T Transformer, xlsx file)

please check it

5811.48F-76NWZ2NL(REV1.1).pdf

SNLR048A_241223.xlsx

Hi Hyoungrae,

Thank you for returning the detailed data.

Regarding the magnetics used, shorted center taps are not recommended:

I am currently out of office, so more time is needed to analyze if layout violations in checklist are expected to cause transmitter distortion failure.

In the meantime, I will check if there are any suggested register changes or BOM replacements to improve test performance.

Thank you,

Evan 

Hi Hyoungrae,

Is passing this compliance test a strict requirement for the application? The margin for failure seen in report is not expected to affect device functionality.

I have one BOM change suggestion - on ground side of RBIAS resistor, please solder a 33pF capacitor to ground. There are past cases where we have seen this improve distortion performance.

Thank you,

Evan

Hi,

The 33pF capacitor is also problem.

Pair-C has only 0% result value.

please check it

Hi Hyoungrae,

Thanks for confirming.

Do you have a footprint compatible transformer to replace 48F-76NWZ2NL with, following datasheet recommendation?

Shorted center taps are expected to worsen isolation and compliance performance.

Thank you,

Evan

Hi,

At the moment, there are no replaceable parts.

In previous PCB versions, distortion was PASS.

Is there anything I can modify other than changing parts?
(Circuits or PCB design)

please check it

Hi Hyoungrae,

What were the changes from previous PCB version? Was this using another PHY?

The PCB layout looks good to me, but I cannot see dimensions from the image shared.

Please check MDI trace length and spacing against the layout checklist recommendation:

https://www.ti.com/lit/zip/snlr048

Thank you,

Evan