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DS90UB954-Q1: CSI-2 Synchronous back channel mode with STP

Tomoaki Yoshida91
Genius 5255 points
Part Number: DS90UB954-Q1

Hi team,

Our customer wants to use 953-954 synchronous back channel mode with STP.

However, looking at the mode setting in Table.1 of the datasheet, there is only CSI-2 asynchronous back channel mode in STP.

In other words, does it mean that synchronous back channel can not be done in STP?

They have rewritten the register 0x6E[2] COAX_MODE after setting to COAX CSI-2 synchronous back channel mode of No. 4 with a strap.

Is this method correct?

Best regards,

Tomoaki Yoshida

  • 0
    TI__Expert 4555 points
    Yoshida-san,

    Synchronous/asynchronous mode are independent of whether or not you use Coax or STP. In other words, synchronous back channel IS supported in STP.

    You should set the back channel frequency to 50 Mbps, which is the default for DS90UB953 CSI Synchronous backchannel compatibility (Refer to Register 0x58: BCC_Config to set this).

    I also believe you mean setting register 0x6D[2] (Original post had 0x6E[2])? The default value of this pin is set by the strap condition of the MODE pin upon asserting PDB = HIGH at startup - so your selection of strap configuration mode No. 4 is correct. You can also write a 0 to this bit to manually set the mode to STP as well.

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    Regards,
    Jonny
  • 0 in reply to Jonathan Nguyen
    Genius 5255 points

    Hi Jonathan-san,

    Thank you for your support.

    Sorry, it was typo, 0x6D[2] is right.

    I understand that synchronous/asynchronous mode are independent.

    Please let me know if there is any other setting registers.

    Best regards,

    Tomoaki Yoshida

  • 0 in reply to Tomoaki Yoshida91
    TI__Genius 12705 points
    Hello,
    No other registers setting would impact coax vs. STP operation.