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DP83TD510E-EVM: hardware straps

Part Number: DP83TD510E-EVM

there is something that I don't understand at page 4 of the EVM schematics HSDC080A(002):

R199 and R200, straps for pin LED2-1, are both mounted.. is it correct?

even more, the same signal is connected to J18 and there we can find that R28 or R203 could be connected as well, inserting a jumper.

Something similar happens to the LED0-1 signal, pulled down by R92, but other resistors could be inserted by J20

Am I missing something?

Thank You

Alberto

  • Hello Alberto,

    I am looking into and will get back in a day.

    --

    Regards,

    Vikram

  • Hello Alberto,

    There is some delay at my end to get the schematic reviewed. I am following up.

    --

    Regards,

    Vikram

  • thank You, I will wait.

    Beside that, my design will be a bridge quite similar to this EVM, but without a microprocessor.

    Will I be able to reach the maximum performances (cable length) just with the hardware straps? I have seen in this forum many configuration files touching internal registers even not described in the datasheet, and this makes me worried..

    regards,

    Alberto

  • any news?

    thank You

    Alberto

  • Hello Alberto,

    We looked at all our EVM boards and schemtics. And your observation is correct. We have found that in our latest EVMs those resistors (you pointed out are extra and should not have been there). Though team has checked and found that EVMs are working fine even with those resistors in place but we recommend depopulating those and use jumpers to select the required pull-up/pull-down strap.

    Also we have found that option of USB powered EVM requires making resistor R24 = 0 ohms.(connected between usb to ground)

    Also I confirmed that straps are sufficient for long cable reach on our silicon in production. What is the cable type and  reach are you looking at? Also to be sure that production silicon is mounted on your EVMs, can you please share values of register 0x0002 and register 0x0003?

    Thanks again for your patience. It took a while to get hold of all the EVM versions in the lab, check their BOM and to make sure that they are working fine (with current BOM).

  • many thanks,

    now I can proceed with my design

    regards

    Alberto