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Variations in AM335x DDR3 using Software Leveling

paddu1
Expert 1195 points
Other Parts Discussed in Thread: AM3359

Hello,

This is a basic question about the "Software Leveling procedure" for AM3359 DDR3.
We are using the recommended procedure for determining DDR PHY register values.
However, we are trying to check with different custom boards(around 4)
and there are some variations in the optimal values across different boards.
We are confused bcos there are no common values,
is it ok if we make an average of all the values and use it as common for all the boards?

Regards.
Paddu

  • 0 in reply to paddu1
    Prodigy 140 points

    Hi Paddu1,

    What DDR3 chips are you using? We used MT41J256M8HX-15E. However, so far we cannot get the DDR3 to response. Could you get the DDR3 to respond?

    DL

  • 0 in reply to Coder
    Expert 1195 points

    Hi DL,

    I am not sure which DDR3 chips our customer is using but they are able to 

    communicate with the DDR3 properly but as TI suggests to do the software leveling procedure

    they are testing for the optimum values with that software.

    Have you tried the latest DDR3 Gel file?

    Regards.

    paddu