DP83867CR: Regarding to the MAU test

Hi Masakazu-san,

Thank you for your query. For compliance test, is this test the only test that is failing? This is 10Base-Te, so has customer also tested 100Base-Tx and 1000Base-T? For this test, it requires the GBE-EEE fixture from Tektronix. Can customer confirm the test setup via a picture? 

In addition, can customer please send a copy of the 10Base-Te report, and conduct schematic and layout review using attached documents?

Sincerely,

Gerome

Hello Gerome-san,

I received a picture from the customer.

Gerome Cacho said:

Thank you for your query. For compliance test, is this test the only test that is failing? This is 10Base-Te, so has customer also tested 100Base-Tx and 1000Base-T? For this test, it requires the GBE-EEE fixture from Tektronix. Can customer confirm the test setup via a picture? 

Both 1000Base and 100Base are checked. The result is low margin OR no margin, but the obvious NG is this item for 10Base.

Also, attached the test setup.

Gerome Cacho said:

In addition, can customer please send a copy of the 10Base-Te report, and conduct schematic and layout review using attached documents?

I requested schematic and layout review to the customer. And, attached the test report.

10base test result.pdf

Regards,

Masakazu

Hi Masakuzu-san,

The overall theme from this is that 10base-Te is overall lower than what the scope is expecting. However, I do see that the limits of VoD look different than expected. Can you double check that scope setting of "energy efficient" is on? This will transition the scope from 10Base-T limits to 10Base-Te, which has expected lower amplitude.

Sincerely,

Gerome 

Hello Gerome-san,

The customer  checked the settings and the setting was on.
Is it correct that the items to be checked here are settings on the host PC side?

Regards,

Masakazu

Hello Gerome-san,

I received to additional information from the customer. They confirmed that schematic and layout. Also, they said following points are different compared with check list. Do these affect 10 base?

File: SLVRBN1_ DP83867_Design_Review_Checklist.xlsx

Sheet: Pin Wise Checklist　7 row

Item: GND

→The resistor is mounted 0Ω.

The capacitor is not 4700pF, but another constant is implemented.

File: SLVRBN1_ DP83867_Design_Review_Checklist.xlsx

Sheet: Layout Checklist　15row

Item: Signal Routing

→There were some areas where 30 mils were not taken.

Regards,

Masakazu

Hello Masakazu-san,

According to our reports, the max voltage differential for 10BASE-Te should be 1.54-1.96V. Thus this is why I believe the test is testing for 10Base-T (less energy efficient; thus expecting higher amplitude). I would advise having customer check with scope vendor for how to enable 10Base-Te support. 

Lets focus on this first before moving our attention to the layout checklist.

Sincerely,

Gerome