• State
  • Replies 3 replies
  • Subscribers 98 subscribers
  • Views 65 views
  • Users 0 members are here
Support feedback
Options
Options
Related

AM625: How to Disable DDR Command Bus Training

Maurice Lu
Prodigy 160 points

Part Number: AM625

Hi team,

We are studying the behavior of DRAM Command Bus Training (CBT) on AM62x EVM.
I have tried to set PI_61 bit[0]=0, PI_199 bit[16]=0 bit[8]=0 bit[0]=0, but still unable to disable CBT.
Could you guide me about how to disable CBT at the initial stage?
Thanks.

B.R,
Maurice

  • 0
    TI__Guru* 94741 points

    Hi Maurice, I'm not sure that can be done, i will have to check.

    Can you try disabling all training with PI_4[0] = 0?  Let me know if this disables CBT , i know it disables all the other training at operating frequency.

    Regards,

    James

  • 0 in reply to JJD
    Prodigy 160 points

    Hi James,

    Thanks, we will check that.
    Regarding CBT, we suspect that power may impact the training result.
    Could you guide us about how to adjust VDD1/VDD2/VDDQ?
    Thanks.

    B.R,
    Maurice

  • 0 in reply to Maurice Lu
    TI__Guru* 94741 points

    Our EVMs have PMICs which have most voltage rails that are controlled via I2C.  These can be adjusted in uboot with a few commands.  Which EVM are you working with? 

    Regards,

    James