• State
  • Locked Locked
  • Replies 2 replies
  • Subscribers 98 subscribers
  • Views 353 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TDA4VM: the waveform of DQ and DQS abnormal

? ?
Prodigy 10 points
Part Number: TDA4VM

We use the new parameters as follows:

#define DDRSS_PHY_33_DATA 0x0C002000

#define DDRSS_PHY_289_DATA 0x0C002000

#define DDRSS_PHY_545_DATA 0x0C002000

#define DDRSS_PHY_801_DATA 0x0C002000

we use micron LPDDR4:MT53E1G32D2FW-046 AAT:A

the waveform see DQ and DQS has some abnormal timing:

how can we solve the problem?

  • 0
    TI__Mastermind 38240 points

    Hi,

    Please use the provided tool to generate register values. A value of '0' for PHY_WDQLVL_PATT is not supported.

    https://www.ti.com/lit/pdf/spracu8 

    Thanks,
    Kevin

  • 0 in reply to Kevin S
    Prodigy 10 points

    how can we close the DQ training?

    first time we use the tools to generate Register values，but we find we are not able to start sometimes，so we change the  parameters 

    #define DDRSS_PHY_33_DATA 0x0C002006

    #define DDRSS_PHY_289_DATA 0x0C002006

    #define DDRSS_PHY_545_DATA 0x0C002006

    #define DDRSS_PHY_801_DATA 0x0C002006

    and then we can start steady

    but we we test the waveform of DQ and DQs ,we can also find the abnormal timing

    we contact with micron ,they say maybe the TDA4 open the DQ bus training ,so we cannot catch the real waveform 

    so we close the all DQ bus training and the waveform did not improve

    what can we do now?  If there are other parameters need to set up?