DP83848I-MAU-EK: 10Mbps DP83848 MAU

Arash Sabet-Payman

Prodigy 480 points

Part Number: DP83848I-MAU-EK

Can you explain what the flat lines are in the eye diagram attached? (related to a question from Hung)

over 6 years ago

0 Aniruddha Khadye over 6 years ago

TI__Mastermind 18425 points

Hi User5364787,

What is the relation between the scope picture and the previous E2E question? Is it measured on the same setup?

If the PHY working in 10Mbps mode and connected to a link partner?

-Regards,
Aniruddha

0 Arash Sabet-Payman over 6 years ago in reply to Aniruddha Khadye

TI__Prodigy 480 points

It was a follow up question posed to me after he solved his previous issue, so I believe it is the same set up.

0 Aniruddha Khadye over 6 years ago in reply to Arash Sabet-Payman

TI__Mastermind 18425 points

Hi,

Can you share the schematics and where on the system were the two waveforms measured?

-Regards,
Aniruddha

0 Arash Sabet-Payman over 6 years ago in reply to Aniruddha Khadye

TI__Prodigy 480 points

Hi,

I do not have that information. I believe this to be a measurement error, but don't want to make that assumption.

Thanks

0 Aniruddha Khadye over 6 years ago in reply to Arash Sabet-Payman

TI__Mastermind 18425 points

Hi,

10Mbps idle pattern has a flat component in its waveform but its not a square wave. Which is why we would need to know where they are measuring both waveforms? Also is customer facing any issues due to this?

-Regards,
Aniruddha

0 Arash Sabet-Payman over 6 years ago in reply to Aniruddha Khadye

TI__Prodigy 480 points

I am fairly confident that the user is doing his measurements incorrectly . I will follow up if I learn something new

0 John Griffith over 6 years ago in reply to Arash Sabet-Payman

TI__Mastermind 21501 points

Hi everyone,

I received a little bit more information from the customer this morning and I would like to find out from you what additional information do we need to help solve this issue.

Signals taken at TX+ vs TX- (short wires) shown in the picture below
My signal is 10Mbps Manchester coding when the chipset goes into 10Mbps.
Pink trace from the previous posting waveform is the Txclk, yes.

Please let us know if this helps and if there is anything else you need. Thanks,

John

0 John Griffith over 6 years ago in reply to John Griffith

TI__Mastermind 21501 points

Hi everyone,

Any update on this?

Thanks,

John

0 Aniruddha Khadye over 6 years ago in reply to John Griffith

TI__Mastermind 18425 points

Hi John,

Is this still open? The conclusion was that there may be some setup issue on customer side.

Also, what is the issue faced by customer? Is it no link, packet errors, cable reach etc?

-Regards,
Aniruddha

0 John Griffith over 6 years ago in reply to Aniruddha Khadye

TI__Mastermind 21501 points

Hi Aniruddha,

On a previous message I have attached a diagram of where the customer was measuring the eye diagram like you asked and I added some additional information that they shared. I am asking you if you have any information you can share on how they should perform this test or if they are testing it at the correct location what debugging steps should they try so that they can get a proper measurement.

Thanks,

John

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DP83848I-MAU-EK: 10Mbps DP83848 MAU