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AM3354: PHY_INVERT_CLKOUT

Nancy Wang
Expert 8210 points
Part Number: AM3354

Hi,

INVERT_CLKOUT should remain 1 regardless of CLK to DQS trace length, does this only apply to DDR3? What about DDR2 and LPDDR? 

1031._5563B783_.PNG (1781×429)

processors.wiki.ti.com/.../AM335x_EMIF_Configuration_tips

  • 0
    TI__Guru 68880 points

    Yes, DDR3 has a completely different spreadsheet and appnote as described in the wiki.  For DDR2 and LPDDR, follow the guidelines in the wiki 

    CMDx_PHY_INVERT_CLKOUT - In addition to programming these registers with 0 or 1 as defined below, plug this value into the spreadsheet to get the proper values for other registers

    • If (DDR_CK length) < (DDR_DQS length), program these registers to 1
    • If (DDR_CK length) > (DDR_DQS length), program these registers to 0

    Regards,

    James