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DDR speed in omap4460

Kavitha bk
Prodigy 160 points


HI

I am running DDR at 400MHZ

To confirm the speed I checked using http://www.elinux.org/Board_Bringup_Utilities

the emif test showed 200MHz

I checked the clock settings in X-loader

 /* 38.4M values - DDR@400MHz*/
 {0x7d, 0x05, 0x01, 0x05, 0x08, 0x04, 0x06, 0x05},



and also the Register values of dpll core are opreating at OPP100
and Omapconf opp also shows ddr at 200Mhz


Does that mean I am missing some more settings or Omapconf shows L3_CLK but but not ddr Frequecy
Please Help me understand how the omapconf calculates the DDR speed


Thanks
Kavitha
  • 0
    TI__Intellectual 815 points

    Hello Kavitha,

    The frequency omapconf is reporting for EMIF is correct.  The DMM/EMIF value is referring to the EMIF_FCLK for the EMIF controller, which is not the lpddr's frequency.  When the EMIF_FCLK is at 200Mz, the lpddr is at 400MHz.

    Are you using the latest version of omapconf, 1.50?  It should list LPDDR2 right beneath the DMM/EMIF entry.

    Regards,

    Alex