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AM6442: Connections for OSPI unused pins

rei
Mastermind 6155 points
Part Number: AM6442

Hi,

My customers are designing a schematic with AM6442.

Customers use QSPI, so they don't need OSPI pins. Please tell us about connections for following unused pins.

・OSPI0_DQS
・OSPI0_LBCLKO

The datasheet shows(P.125):
All other unused signal balls with a Pad Configuration Register can be left unconnected with their multiplexing mode set to GPIO input and internal pulldown resistor enabled.

Is it correct to be unconnected these pins?

Regards, Rei

  • 0
    TI__Genius 13495 points

    Hi Rei,

    I will need to check with our OSPI/ QSPI expert after the US Labor Day holiday.  We will respond early next week.

    Regards,
    Mike

  • 0 in reply to Michael Erdahl
    Mastermind 6155 points

    Hi MIke,

    Thank you for your reply. I look forward to your information.

  • 0 in reply to rei
    TI__Genius 13495 points

    Hi Rei,

    Still working on getting an answer for you.

    Regards,
    Mike

  • 0 in reply to Michael Erdahl
    TI__Genius 13495 points

    Hi Rei,

    I found your answer in the latest version of the TRM in section 4.4.1 OSPI\xSPI\QSPI\SPI Boot.

    Here is the relevant text based on what you were asking:

    To support only low speed OSPI\xSPI\QSPI\SPI operation (ie, <=50MHz OSPI clock), set BOOTMODE8=1 to use internal iclk, and ensure signal LBCLKO is a no connect (ie, absolutely no trace can be connected to LBCLKO). Operation for both ROM boot and normal operating mode will clock the interface at low speed and use the internally pad looped back clock. The DQS and LBCLKO signals will not be used during boot or normal operation

    Regards,
    Mike

  • 0 in reply to Michael Erdahl
    Mastermind 6155 points

    Hi Mike,

    Thank you for your information. I understand LBCLKO is NC and DQS and LBCLKO signals will not be used during boot or normal operation.

    Let me confirm to make sure. Is OSPI0_DQS NC?

    Best regards,

    Rei

  • +1 in reply to rei
    TI__Genius 13495 points

    Hi Rei,

    Correct, DQS is a NC.  Just to confirm, the QSPI device is low speed (<=50MHz)?  I made this assumption based on your original question to omit DQS and LBCLKO.

    Regards,
    Mike

  • 0 in reply to Michael Erdahl
    Mastermind 6155 points

    Hi Mike,

    Thank you very much!

    If something comes up, I will post.

    Best regards,

    Rei