DP83TC813R-Q1: dp83tc813r rmii

Herry Huang

Prodigy 70 points

Part Number: DP83TC813R-Q1

Hi expert

I using DP83TC813R-Q1 connect with RMII for BBU, now, PCS loopback can capture loopback signal by oscilloscope.

But MAC read nothing. So as my experience is timing issue. I using this driver code, this is link.

so i have several questions:

1: i could not find chip initial register description in TRM.

2: Driver code don't have any timming adjust operation. I think need read config parameter from device tree. but nothing.

3:Two bits how to set four bits? so red is OK?

7 months ago

0 David Creger 7 months ago

TI__Mastermind 21806 points

Hi Herry,

Let me check on this and get back tomorrow.

Thanks,

David

+1 David Creger 7 months ago in reply to David Creger

TI__Mastermind 21806 points

Hi Herry,

Can you please read registers 0x45D and 0x648 and share the values with me?

To answer your questions:

Register descriptions are available in SNLA389
No timing adjustment should be needed by default, provided a +-50ppm clock source is used.
What you have written in red is correct.

Thanks,

David

0 Herry Huang 7 months ago in reply to David Creger

Prodigy 70 points

Hi Davie

Thansk for your reply and sorry for delay reply due to Chinese holiday.

I read register 0x45d & 0x648 as below

So register 0x45d is 0x1160, register 0x648 is 0x160.

0 David Creger 7 months ago in reply to Herry Huang

TI__Mastermind 21806 points

Hi Herry,

Thanks for sharing the registers. Can you please share the schematic for review?

Thanks,

David

0 Herry Huang 7 months ago in reply to David Creger

Prodigy 70 points

Hi David

Yes, but we found an error on our board. it fixed. please ignored.

At same time, i face a strange thing, MDIO some times couldn't access phy. board temperature up have more chance can access phy(dp83tc813).

0 David Creger 7 months ago in reply to Herry Huang

TI__Mastermind 21806 points

Hi Herry,

Glad to hear the RMII issue is resolved.

You had shared a screenshot of register write working. What are the conditions in which MDIO cannot access PHY? Please share the screenshot of good case and bad case.

Thanks,

David

0 Herry Huang 7 months ago in reply to David Creger

Prodigy 70 points

Hi David

That's random, hard to access PHY on MDIO. so it is weird.

0 David Creger 7 months ago in reply to Herry Huang

TI__Mastermind 21806 points

Hi Herry,

Please see SNLA431, several debug steps are suggested for read/write issues.

Thanks,

David

0 Herry Huang 7 months ago in reply to David Creger

Prodigy 70 points

Hi David

Thanks, we check schematic by ourself,

0 David Creger 7 months ago in reply to Herry Huang

TI__Mastermind 21806 points

Hi Herry,

Let me know what you find or how I can assist further.

Thanks,

David

0 Herry Huang 6 months ago in reply to David Creger

Prodigy 70 points

Hi David

We confirm that phy is in sleep mode, so cann't accessble, thanks

0 David Creger 6 months ago in reply to Herry Huang

TI__Mastermind 21806 points

Hi Herry,

Glad to hear you found the solution. Let me know if I can further assist.

Thanks,

David

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DP83TC813R-Q1: dp83tc813r rmii