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DM8107 DDR3 work at 533MHZ wolud crash

xixi
Expert 2990 points
Other Parts Discussed in Thread: DM8107

Hi all,
     

         I 'm working on dm8107 which is a custom board.      

        When I set DDR3 working at 400MHZ,It can work well 

        But When I set DDR3 working at 533MHZ,we can enter linux system.

        while the rdk demo can only run about several minutes and then the board would crash

        In both cases the ARM clock is 720MHZ,HDVPSS and L3 is 240MHZ,ISS is 480MHZ, IVA is 390MHZ.

        My DDR3 is 256MB and the bus width is 16bit

        the rdk demo is a network-vdec-vdis demo

  • 0
    Expert 2990 points

    Hi：

          As far as I know ，only when  DM8107's supply  voltage is OPP_TURBO , the DDR3 can get to 533MHZ.

    So I modified the CVDD,CVDD_ARM,CVDD_HDVICP to 1.35V. But is has no use.

         Now I find VDD_MPU_OPP_166 Register,VDD_HDVICP_OPP_166 Register,VDD_CORE_OPP_166 Register

    in datasheet.So I want to know whether the registers have use and how I can configure them.

        thanks

  • 0 in reply to xixi
    TI__Genius 13460 points

    Hi,

    If you are using a customized board, you need to 

    1. make sure the HW design rules obey the DDR3 rules.

    2. If you changed the DDR3 chips, modify DDR3 registers according to your DDR3 spec.

    3. Do DDR SW leveling as well.

    Please go to ti processor wiki for the items mentioned.

    BR

    Eason

  • 0 in reply to Eason Wang
    Expert 2990 points

    Hi Eason

          Thanks for your reply

          I have found the reason, it caused by poor welding

         

  • 0 in reply to xixi
    Intellectual 475 points

    Hi quan wang,

    same issue is observed by me.It observed in some the board only. 

    Regards,

    Bharat Gohil