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[FAQ] AM625: MMC0 PCB Connectivity Requirements

reto hermann
Intellectual 740 points

Part Number: AM625

Tool/software:

Hi

we have issues with an eMMC connected to MMC0 of a AM6254 processor on a custom board.

In the datasheet of the AM625 processors we found layout requirements for the MMC0 interface. 



Does this "min" specification mean that the traces of the MMC0 interfaces MUST have a minimum length? If yes can you specify this in inches or mm?

Thank you for your reply. 
Kind regards
Reto

  • +1
    TI__Guru 64655 points

    Yes, there is a minimum trace delay requirement for this peripheral.

    The delay values are defined with the unit of picoseconds (ps). You will need to determine the propagation velocity of each signal trace on your specific PCB design to know how much additional trace needs to be inserted to achieve the appropriate delay.

    Regards,
    Paul