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DP83867ERGZ-R-EVM: DP83867 having issues with Gigabit Ethernet Switch

sarath sai
Intellectual 325 points
Part Number: DP83867ERGZ-R-EVM

HI,

i have custom board with DP83867 with RGMII Interface connected through EMAC of Shrac SC587 when i directly work on custom Board it completely works fine but when i connect multiple boards (i.e More than 3 Dp83867 custom boards) it is having issues....... any one of 3 having issue other two works fine but this is not same all the time...... for example if board 1 fails 1st time board 2 and board 3 works 2nd time if i test 2 will have issue but 1 and 3 works...... does switch is producing any delays??

switch used was  D-LINK DGS-1008A 8 port

Note: according datasheet of Dp83867 all the applicable settings are made like straps according to Strap Configuration of datasheet, master slave configuration full duplex and auto negotiation 

please suggest us if anything else need to be done still

regards

Sarath M

  • 0
    TI__Genius 11725 points

    Hi Sarath,

    Can you describe in more detail the nature of the failure? Is the issue with packet errors, link up, etc.?

    Thank you,

    Nikhil

  • 0 in reply to Nikhil Menon
    Intellectual 325 points

    hi Nikhil,

    link is stable but when i ping the board it hangs  and  works after sometime  my question is when i work with gigabit switch with two boards  i don't have any issues when i connect the third board one two woks but 3rd fails hardware wise everything looks fine when it comes to link, auto-negotiation and other stuff with DP83867

    regards

    Sarath 

  • 0 in reply to sarath sai
    TI__Genius 11725 points

    Hi Sarath,

    How are the three boards and the processor connected? Which pins/interface?

    Thank you,

    Nikhil

  • 0 in reply to Nikhil Menon
    Intellectual 325 points

    Hi,

    All three broads are connected  independently to switch (one Board=SC587+DP83867) and I'm using RGMII interface between dp83867 and SC587 

    regards

    Sarath

  • 0 in reply to sarath sai
    TI__Genius 11725 points

    Hi Sarath,

    A couple questions:

    • Are the boards with the DP83867s all able to successfully link to each other?
    • Are the different ports of the switch all able to successfully link to each other?
    • How many ports is the switch? With all ports of the switch populated by connecting to other ports of the same switch, is the switch still functional?
    • Do all boards share the same power supply? When linking multiple devices to the switch, current consumption will increase as each device links up. Can I ask if this power consumption for multiple boards been budgeted?

    If there is a doubt about the DP83867 MDI performance, you may try running a loopback test between two of the DP83867 boards across the MDI. One board may be set to generate packets to send across the cable, and the second board can be configured for reverse loopback to loop packets back across the cable. Please review section 8.4.4 of the datasheet for setup details and please feel free to reach out if additional guidance for this test is needed. I suspect the DP83867 is working as expected based on the fact that individually, the switch is working with individual boards. I suspect there may be a power issue if all boards are powered through the same rail. As mentioned, current consumption will increase when the device links up vs. when idle. 

    Thank you,

    Nikhil 

  • 0 in reply to Nikhil Menon
    Intellectual 325 points

    Hi Nikhil,

    All the boards are successfully linked up....

    its a 8 port switch i have shared the web link of the switch specifications.

    power supply issue wont be there i have taken care whole my board consumes 200mA at 28V so i have 2A max rated power supply when links up it takes a bit more current but power supply is fine i feel

    regards

    Sarath M

  • 0 in reply to sarath sai
    TI__Genius 11725 points

    Hi Sarath,

    Does your statement "all the boards are successfully linked up" apply to both of my first two bullet points? Can you confirm the following

    • Every DP83867 board successfully links up with each other.
    • Using the same wires to connect each DP83867 board to the switch, the ports of the switch link up with each other (Swith port 1 links with port 2, port 3 links with port 4, etc. all at the same time).
    • Is each board powered with it's own 28V supply, or is it a single 28V supply for every board?

    Thank you,

    Nikhil

  • 0 in reply to Nikhil Menon
    Intellectual 325 points

    Hi Nikhil,

    Yes it refers to first two points, all the boards are linked up successfully with switch.

    and i have used single power supply to power on all three boards

    max supply current is 2A but my all three boards consumes 800mA

    regards

    Sarath M

     

  • 0 in reply to sarath sai
    TI__Genius 11725 points

    Hi Sarath,

    We are looking into this issue and will provide an update by Wednesday of this week.

    Thank you,

    Nikhil

  • 0 in reply to Nikhil Menon
    Intellectual 325 points

    Hi,

    we have delivery on this weekend according to you we have to update our firmware so requesting you to  not make any delay 

    regards

    Sarath M

  • 0 in reply to sarath sai
    TI__Genius 11725 points

    Hi Sarath,

    We have concluded that individually, each DP83867 board is able to link up with each other. Additionally, all ports of the switch are able to link up to each other simultaneously (all 8 ports populated). The problem only occurs if multiple DP83867 boards are plugged into the switch at the same time. There is no issue with the power consumption when multiple DP83867 boards link up with the switch. 

    Are you able to share a schematic and layout at this time? If files cannot be shared publicly, you may reach out via private message. I have sent a request to connect. 

    Thank you,

    Nikhil