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Original question:

HD3SS3220: HD3SS3220

HD3SS3220: Two devices link and use HD3SS3220 DRP mode

Eddie Yeh
Prodigy 360 points
Part Number: HD3SS3220

Hi teams

There are two device using HD3SS3220 and setting to DRP in GPIO mode.

At first step, they connect then who will be DFP, how do they decide their role?

Thank you

  • 0
    TI__Guru*** 147255 points

    DRP devices will initially toggle their state between DFP (by connecting Rp and disconnecting Rd ) and UFP (by disconnecting Rp and connecting Rd ) operation, until the complimentary termination is found at the port partner on one of the CC lines.

    When two DRPs are connected together, they accept the resulting DFP-to-UFP relationship achieved randomly. Both DRPs toggle their states between DFP and UFP . Whenever a successful Rp – Rd voltage divider is formed on one of the CC lines, the connection is established.

  • 0 in reply to Brian Zhou
    TI__Prodigy 360 points

    Hi Brian

    Is stand process of two DRP depending on who provide the power and then the one will be DFP?

    And your above mentioned the achieved randomly scenario is for all of both sides could provide power?

  • 0 in reply to Eddie Yeh
    TI__Guru*** 147255 points

    Eddie:

          As DRP , they both should provide power when configured as DFP.  But Vbus is not requirement during CC configuration to decide which is DFP or UFP

    Regards,

    Brian