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Original question:

AM6422: How to enable Periodic ZQ calibration for DDR4

AM6422: DDR4: periodic ZQ calibration status

Christian Kohler25
Intellectual 290 points
Part Number: AM6422

Tool/software:

Hi James.

How is the status of periodic ZQ calibration feature for AM64?

When this feature will be available?

BR,

Christian

  • 0
    TI__Guru* 87020 points

    Hi Christian, I will try to at least get you some manual tweaks which you can try out by end of week.  Probably won't be able to get it officially into the tool till Sept

    Regards,

    James

  • 0 in reply to JJD
    TI__Guru* 87020 points

    Hi Chris, can you implement the following changes to the DDR register header file

    -#define DDRSS_CTL_300_DATA 0x00000000
    -#define DDRSS_CTL_301_DATA 0x00000000
    +#define DDRSS_CTL_300_DATA 0x61A80000
    +#define DDRSS_CTL_301_DATA 0x0000FFFF

    -#define DDRSS_CTL_315_DATA 0x00000100
    +#define DDRSS_CTL_315_DATA 0x01010100

    This should give you a periodic ZQ calibration every 256ms.  

    Regards,

    James