DP83867IR: DP83867IRPAPR Phy RX is not working at 1GBPS

Jonathan Navor

Part Number: DP83867IR
Other Parts Discussed in Thread: TPS2378

Hi team,

Good day! I'm posting this in behalf of the customer. Here it is.

We are DP83867IRPAPR PHY interfacing with i.MX8QXP processor from NXP. When we trying to run interface at 1GBPS it is not working.

we probed TX_CLK it is observed to be 125 Mhz but RX_CLK is 25Mhz when trying to run at 1GBPS.

Interface works fine on 100MBPS speed.

Thank you in advance.

Best regards,

Jonathan

over 3 years ago

0 Hillman Lin over 3 years ago

TI__Mastermind 25955 points

Hi Jonathan,

I would like to ask couple questions for clarification:

What is the link partner you are using?
What type of cable you are using?
Could you also provide the information on register 0x0009, 0x0032, 0x0086

Sorry for the late reply.

Sincerely,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Thank you for your update and apologies for the delayed response.

Here is the answer from our customer

Hillman Lin said:
What is the link partner you are using?

Laptop.

Hillman Lin said:
What type of cable you are using?

CAT6 cable

Hillman Lin said:
Could you also provide the information on register 0x0009, 0x0032, 0x0086

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

It seems like your PHY is not link up during 1000mbps.

Could you tell me what MAC interface are you trying to perform? It seems that your RGMII is not enable in the register 0x0032.
Could you also read register 0000?
If the register 0000 does not have the value 0100. Could you write it 0100 to register 0000?
After all that, could you read register 0100 to check for a link up?

Thank you,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi HIllman,

Here is the feedback from the customer

Hillman Lin said:
Could you tell me what MAC interface are you trying to perform? It seems that your RGMII is not enable in the register 0x0032.

RGMII

As per customer, they tried the registers as asked, but link was not up for 1Gbps. Attached is the console log

Fullscreen console log.txt Download

We tried the registers as asked, but link was not up for 1Gbps. Below is the console log.

root@nxp-imx8:~# phytool read eth0/0/0x0000
0x1140
root@nxp-imx8:~# phytool write eth0/0/0x0000 0x0100
fec 5b040000.ethernet eth0: Link is Down
root@nxp-imx8:~# fec 5b040000.ethernet eth0: Link is Up - 10Mbps/Full - flow control off
root@nxp-imx8:~# phytool read eth0/0/0x0000
0x0100
root@nxp-imx8:~# phytool read eth0/0/0x0100
0x0100
root@nxp-imx8:~# ethtool eth0
Settings for eth0:
       Supported ports: [ TP    MII ]
       Supported link modes:   10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Full
       Supported pause frame use: Symmetric
       Supports auto-negotiation: Yes
       Supported FEC modes: Not reported
       Advertised link modes:  10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Full
       Advertised pause frame use: Symmetric
       Advertised auto-negotiation: Yes
       Advertised FEC modes: Not reported
       Speed: 10Mb/s
       Duplex: Full
      Auto-negotiation: off
       master-slave cfg: preferred slave
       master-slave status: slave
       Port: Twisted Pair
       PHYAD: 0
       Transceiver: external
       MDI-X: Unknown
       Supports Wake-on: g
       Wake-on: d
       Link detected: yes
root@nxp-imx8:~#



We tried to enable RGMII as below, but result was same (link not up).

root@nxp-imx8:~# phytool write eth0/0/0x0032 0x0080
root@nxp-imx8:~# phytool read eth0/0/0x0032
0x0080
root@nxp-imx8:~# phytool write eth0/0/0x0000 0x0140
root@nxp-imx8:~# fec 5b040000.ethernet eth0: Link is Down
root@nxp-imx8:~# phytool read eth0/0/0x0011
0xa802
root@nxp-imx8:~# ethtool eth0
Settings for eth0:
       Supported ports: [ TP    MII ]
       Supported link modes:   10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Full
       Supported pause frame use: Symmetric
       Supports auto-negotiation: Yes
       Supported FEC modes: Not reported
       Advertised link modes:  10baseT/Half 10baseT/Full
                               100baseT/Half 100baseT/Full
                               1000baseT/Full
       Advertised pause frame use: Symmetric
       Advertised auto-negotiation: Yes
       Advertised FEC modes: Not reported
       Speed: 1000Mb/s
       Duplex: Full
       Auto-negotiation: off
       master-slave cfg: preferred slave
       master-slave status: unknown
       Port: Twisted Pair
       PHYAD: 0
       Transceiver: external
       MDI-X: Unknown
       Supports Wake-on: g
       Wake-on: d
       Link detected: no
root@nxp-imx8:~#

Best regards,

Jonathan

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

Could you write 1140 to register 0000 to enable the auto negotiation? Does that link up?

Regards,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Hillman Lin said:
Could you write 1140 to register 0000 to enable the auto negotiation? Does that link up?

Link is up but it settles down to 100Mbps in this case. Please refer Console_Log2 file attached here

Fullscreen Console_Log2.txt Download

root@nxp-imx8:~# phytool write eth0/0/0x0000 0x1140
root@nxp-imx8:~# phytool read eth0/0/0x0000
0x1140
root@nxp-imx8:~# fec 5b040000.ethernet eth0: Link is Down
TI DP83867 5b040000.ethernet-1:00: Downshift occurred from negotiated speed 1Gbps to actual speed 100Mbps, check cabling!
fec 5b040000.ethernet eth0: Link is Up - 100Mbps/Full (downshifted) - flow control rx/tx
fec 5b040000.ethernet eth0: Link is Down
fec 5b040000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
 
root@nxp-imx8:~# ethtool eth0
Settings for eth0:
        Supported ports: [ TP    MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
        Link partner advertised pause frame use: Symmetric Receive-only
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Auto-negotiation: on
        master-slave cfg: preferred slave
        master-slave status: slave
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: external
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: d
        Link detected: yes
root@nxp-imx8:~#

Best regards,

Jonathan

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

The problems might be in your link partner side. I saw your link partner only advertise 10Mbps and 100Mbps. Does your link partner support 1000Mbps? If so, could you also enable advertisement for your link partner to 1000Mbps as well?

Regards,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Here is our cusotmer's feedback.

Regarding Ethernet link partner, we enabled link partner advertisement to include 1000Mbps, but still negotiated to 100Mbps.
The console log is Attached.

Fullscreen Console_Log3.txt Download

Regarding Ethernet, we enabled link partner advertisement to include 1000Mbps, but still negotiated to 100Mbps.
The console log is below.
 
root@nxp-imx8:~# phytool write eth0/0/0x0000 0x1140
root@nxp-imx8:~# phytool read eth0/0/0x0000
0x1140
root@nxp-imx8:~# fec 5b040000.ethernet eth0: Link is Down
TI DP83867 5b040000.ethernet-1:00: Downshift occurred from negotiated speed 1Gbps to actual speed 100Mbps, check cabling!
fec 5b040000.ethernet eth0: Link is Up - 100Mbps/Full (downshifted) - flow control rx/tx
root@nxp-imx8:~#
root@nxp-imx8:~# ethtool eth0
Settings for eth0:
        Supported ports: [ TP    MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: Symmetric Receive-only
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Auto-negotiation: on
        master-slave cfg: preferred slave
        master-slave status: slave
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: external
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: d
        Link detected: yes
root@nxp-imx8:~#
root@nxp-imx8:~#

Best Regards,
Jason

Best regards,

Jonathan

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

Could you send me the schematics for your customer design for further debug?
Could you ask customer for register 000A and 0011?
If possible, could you ask your customer to disable the auto negotiation on their link partner and force it to 1000Mbps? And then write 0140 to register 0000 to check for link up?
If it does not link up, Could you try to write 001F to 4000 to see rather it link up?

Regards,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Here is the attached schematic below. Our customer will follow up the other information. They are now looking into it.

Ethernet_Circuit.pdf

Best regards,

Jonathan

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

Looking at the schematics, we do have some recommendation:

R21 we recommend to have 1Mohms instead of 0 ohms to isolate
On the MDC and GTX_CLK, we don't recommend using 22 ohms in series because it might effect the clock speed

Other setup looks fine. I will wait for the other result form customer.

Regards,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Thanks. Please see attached log from the customer

Fullscreen console log4.txt Download

root@nxp-imx8:~# phytool read eth0/0/0x000A
0x0800
root@nxp-imx8:~# phytool read eth0/0/0x0011
0x6c02
root@nxp-imx8:~# fec 5b040000.ethernet eth0: Link is Down
 
root@nxp-imx8:~# phytool write eth0/0/0x0000 0x0140
root@nxp-imx8:~# ethtool eth0
Settings for eth0:
        Supported ports: [ TP    MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Auto-negotiation: off
        master-slave cfg: preferred slave
        master-slave status: unknown
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: external
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: d
        Link detected: no
root@nxp-imx8:~# phytool write eth0/0/0x4000 0x001F
root@nxp-imx8:~# fec 5b040000.ethernet eth0: Link is Up - 10Mbps/Half - flow control off
 
root@nxp-imx8:~# ethtool eth0
Settings for eth0:
        Supported ports: [ TP    MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: Symmetric
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: Symmetric
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Speed: 10Mb/s
        Duplex: Half
        Auto-negotiation: off
        master-slave cfg: preferred slave
        master-slave status: slave
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: external
        MDI-X: Unknown
        Supports Wake-on: g
        Wake-on: d
        Link detected: yes
root@nxp-imx8:~#

Best regards,

Jonathan

0 Gerome Cacho over 3 years ago in reply to Jonathan Navor

TI__Mastermind 39815 points

Hi Jonathan,

Hillman is OoO for a couple of days, and will get back to you with a response around the middle of next week.

Sincerely,

Gerome

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

I want to double check is my understanding correct so far.

Customer is able to perform a link up during 100mbps and 10mbps
Customer is not able to get a link up when the auto negotiation is off with 1000mbps
When we turn on the auto negotiation with 10, 100, and 1000mbps advertisement turn on both link partner and PHY. The PHY is link up and but the speed drop back to 100mbps
Is customer able to perform a link when the auto negotiation is off with 100mbps and 10mbps? Could you ask this question to customer?

Regards,

Hillman Lin

0 Hillman Lin over 3 years ago in reply to Hillman Lin

TI__Mastermind 25955 points

Hi Jonathan,

Could you also ask customer to write register 0004 bits [5:8] = 0 to disable the 100mbps and 10mps with the auto negotiation on to see rather it can perform a link up?

--
Regards,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Kindly please see our customer response below.

1. Customer is able to perform a link up during 100mbps and 10mbps- Yes Correct
2. Customer is not able to get a link up when the auto negotiation is off with 1000mbps. Yes correct
3. When we turn on the auto negotiation with 10, 100, and 1000mbps advertisement turn on both link partner and PHY. The PHY is link up and but the speed drop back to 100mbps. Yes Correct
4. Is customer able to perform a link when the auto negotiation is off with 100mbps and 10mbps? Could you ask this question to customer? Please refer attachment
5. Could you also ask customer to write register 0004 bits [5:8] = 0 to disable the 100mbps and 10mps with the auto negotiation on to see rather it can perform a link up? Refer attachment

Best regards,

Jonathan

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

Could you resend the attachment? I did not see an attachment below.

Thank you,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Here is the attachment. Apologies for the delay. I was 000 for the past days.

attachment.zip

Best regards,

Jonathan

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

From the schematic you provide to me. I saw the customer have different schematic on the MDI side than the one we recommended on the datasheet. This might cause the issue on linking up with higher speed: 1000mbps. Is it possible to ask customer follow the datasheet MDI connection shown below:

Regards,
Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Good day! Here is our customer's response.

1. Schematic which we have has POE also, we have taken PoE reference from TPS2378 EVM User’s Guide.(See attachment)

Customer will make changes as suggested.

Best regards,

Jonathan

0 Hillman Lin over 3 years ago in reply to Jonathan Navor

TI__Mastermind 25955 points

Hi Jonathan,

Please let me know the result after the customer change the MDI connection.

--
Regards,

Hillman Lin

0 Jonathan Navor over 3 years ago in reply to Hillman Lin

TI__Genius 9475 points

Hi Hillman,

Our customer reviewed their schematic and identified that pin assignment at RJ45 connector (J14) is wrong for Ethernet so the issue was now resolved.

We can close this thread. Thank you so much for the support.

Best regards,

Jonathan

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DP83867IR: DP83867IRPAPR Phy RX is not working at 1GBPS