DP83822I: Mean Squared Error register address

Michael T Schneider

Part Number: DP83822I
Other Parts Discussed in Thread: DP83867E

Team, can you help with the below question:

could you provide us with the Mean Squared Error register address for the DP83822 PHY? As there are MSE threshold control registers, I imagine there must also be a hidden register for reading the current MSE status.

over 1 year ago

0 Gerome Cacho over 1 year ago

TI__Mastermind 31125 points

Hello,

I will need to check internally with the team regarding this. Please expect a response by EoD Tuesday 7/25/23.

Sincerely,

Gerome

0 Gerome Cacho over 1 year ago in reply to Gerome Cacho

TI__Mastermind 31125 points

Hello,

The MSE register for DP83822 is Reg 0x218.

Sincerely,

Gerome

0 Tom D over 1 year ago in reply to Gerome Cacho

Prodigy 21 points

Hey Gerome,

A couple follow on questions:

Does anything need to be set or commanded for that register to be valid?
Do you know which bits of that register are the mean squared error? Is it the full 16 bits, just the lower 8, or something else?
Is there a relationship between the value in that register and the Signal to Noise Ratio (SNR)?
What are the expectations for the different values of that register? For example, is there a relationship between MSE and link quality similar to the relationship defined in SNLA246b for the DP83867E PHY?

Regards,

TDagostino

0 Gerome Cacho over 1 year ago in reply to Tom D

TI__Mastermind 31125 points

Hello,

I am looking to get this information for you, but will need some time. I expect an update by EoD Wednesday 7/26.

Sincerely,

Gerome

0 Gerome Cacho over 1 year ago in reply to Gerome Cacho

TI__Mastermind 31125 points

Hi TDAgostino,

The register will work as follows:

- The register is for channel A only.

- For excellent link quality, the decimal value of the register shall be below 522.

- For good link, the value shall be between 522 and 827.

- For poor link, the value shall be above 827.

Please note that this register is an extended register and thus will need extended register access to read properly.

Sincerely,

Gerome

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DP83822I: Mean Squared Error register address