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DP83869HM: Fiber connector

visweswara rao kalla
Prodigy 40 points

Part Number: DP83869HM
Other Parts Discussed in Thread: DP83869

Hi. 

I am using AFBR-59E5APZ fiber connector interfaced with DP83869HM.  with termination of 100E (diff pair) , RD+ and RD-  for TD+ and TD- connected directly to DP83869HM 14th and 15th pins. 

Question is : do i need termination for 14th and 15th pins ? 

what is the HW pin strap configuration. since i am using DP83869HM along with copper (1G) 

Please do support. 

thanks, 

Visweswara. 

  • 0
    TI__Mastermind 35975 points

    Hi Visweswara,

    Here is the connection diagram between DP83869 and a fiber transceiver. I see there are AC coupling capacitors integrated to that transceiver, so you do not need to add these externally:

    You do not need any termination on pins 14/15. The common mode voltage will be set by the PHY.

    visweswara rao kalla said:
    what is the HW pin strap configuration. since i am using DP83869HM along with copper (1G) 

    You are using media converter mode (Copper to fiber) correct? In this case, you should use the following strap configuration:

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Prodigy 40 points

    hi shane, 

    I will be using only fiber connector,  RJ45 connector will be depopulated.  I need a configuration for only fiber. which supports min to max speed. 

    resistor values for the same to populate for fiber / depopulate for the RJ45 option. 

  • 0 in reply to visweswara rao kalla
    TI__Mastermind 35975 points

    Hi Visweswara,

    So you want options for RGMII to Copper or RGMII to fiber based on resistor population correct? In this case leave an option to pull down JTAG_TDO/GPIO_1 for copper mode. RGMII to 1000Base-X is 1G fiber mode:

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Prodigy 40 points

    Hi Shane, 

    I need the options for both RGMII to copper and RGMII to fiber both options will be present on a single layout. I will use with Fiber or copper. 

    Suggest me the strap configuration. please  

    thanks in advance

  • 0 in reply to visweswara rao kalla
    TI__Mastermind 35975 points

    Hi Visweswara,

    The red circle on Table 7-12 below shows the strap configuration.

    You need to have a pullup on JTAG_TDO/GPIO_1 for fiber mode, and can de-populate this pullup for copper. Since two-level straps are pulled low internally, the PHY will set these to mode '0' by default:

    You would not need strapping on RX_D3 or RX_D2, but you will need a 2.49k pullup on JTAG_TDO/GPIO_1.

    Best,

    Shane