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DP83867IS: Using the device with only Bootstrap settings

JH Shin
Guru 11110 points
Part Number: DP83867IS

Tool/software:

Hello,

My customer wants to use DP83867ISRGZ as SGMII I/F with only Bootstrap settings without MDIO control.

Q1 Is there any problem with them using DP83867IS with only Bootstrap configuration?

Q2. They found that bit 7 (INT_TST_MODE_1) of register 0x0031 (CFG4) remains set to 1 even though they set RX_CTRL bootstrap to mode 3. Is this normal?

       Is this likely to cause problems with the DP83867IS?

Thank you.

JH

  • +1
    TI__Mastermind 30590 points

    Hi JH,

    For question 1, no there is no problem using strap only mode for SGMII communication. Our DP83867-S-EVM is an example of how to implement this.

    For question 2, as long as RX_CTRL is strapped correctly register 0x31[7] should not interfere with the device functionality. Register 0x6F[8] should be used to track the test mode entry, not 0x31[7]. Register 0x31[7] is helpful if you need to overrule a bad strapping on RX_CTRL, but should not be used by itself to track the test mode.

    A couple questions on my side:

    • Is the customer seeing an issue with DP83867?
    • What value is in register 0x6F[8]? If you are not in test mode this bit should be 1. If you are strapped into test mode this bit would be 0.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    Guru 11110 points

    Hi Shane,

    Thank you for your reply.

    Here are the customer's responses.

    Shane Hauser said:
    Is the customer seeing an issue with DP83867?

    There was no problem with the operation of DP83867IS. I double-checked because I could not find the description of register 0x31[7] for RX_CTRL bootstrap mode 3 in the datasheet.

    Shane Hauser said:
    What value is in register 0x6F[8]? If you are not in test mode this bit should be 1. If you are strapped into test mode this bit would be 0.

    It was confirmed as 0x6F=0x0100, 0x6F[8]=0b1(Normal Operation).

    Regards,

    JH