DP83TC813R-Q1: TC10 sleep settings with Marvell 88Q222x PHY

Gustav Malmstrom

Part Number: DP83TC813R-Q1

Tool/software:

Hello!

I have a device with a DP83TC813R-Q1 PHY that I use to communicate with a device with a Marvell 88Q222x PHY. Ethernet traffic works.

But when I try to initialize TC10 sleep between the PHYs, it does not work with the default settings. Trough trial and error i found two settings in the DP83TC813R-Q1 Phy that makes the sleep and wake request work:

Lower the number of LPS symbols to be received before slp_recv gets set. I get consistent results when I lower it to 32 symbols (default was 64).
Set a limit to 64 symbols for the number of LPS symbols to be transmitted before tx_lps_done becomes true.

Is this expected when communicating with a Marvell 88Q222x PHY? Or could there be some other configuration error?

2 months ago

+1 Drew Miller1 2 months ago

TI__Mastermind 37213 points

Hi Gustav,

Have you already configured the PHY using the open alliance configuration script? If not, could you please try this?

https://www.ti.com/lit/an/snla389f/snla389f.pdf

Thanks,

Drew

0 Gustav Malmstrom 2 months ago in reply to Drew Miller1

Prodigy 101 points

Hello Drew!

I have not done that configuration.

I will try to config the PHY with the registers in table 3-1 and report back with the results.

0 Drew Miller1 2 months ago in reply to Gustav Malmstrom

TI__Mastermind 37213 points

Hi Gustav,

Thanks, looking forward to your update.

Thanks,

Drew

0 Gustav Malmstrom 2 months ago in reply to Drew Miller1

Prodigy 101 points

Hello!

The configuration from the application Note worked, thank you for the help! :)

0 Gustav Malmstrom 2 months ago in reply to Drew Miller1

Prodigy 101 points

One more question about this application note,

With this write to 0x0189, we set the number of expected LPS symbols received to 24.

But from what I've read in the Open Alliance Specification (TC10) it should expect 64 LPS symbols. Have I understood the specification wrong about this?

0 Drew Miller1 2 months ago in reply to Gustav Malmstrom

TI__Mastermind 37213 points

Hi Gustav,

Glad that you issue was resolved. I am discussing this with my colleagues and will get back to you this week.

Thanks,

Drew

0 Drew Miller1 1 month ago in reply to Drew Miller1

TI__Mastermind 37213 points

Hi Gustav,

Apologies for the delay. I believe your understanding of the TC-10 specification is correct.

Based on discussion with colleagues, this setting was required in order to meet TC-10 interoperability compliance testing.

Thanks,

Drew

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DP83TC813R-Q1: TC10 sleep settings with Marvell 88Q222x PHY