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DDR Calibration on iMx6 DL

Question asked by DHANUNJAY KATTA on Jan 12, 2016
Latest reply on Sep 4, 2017 by Yuri Muhin

Hi ALL,

 

I have changed some of the drive strength parameters in DDR config code, all DDR calibration tests are passing.

But I configured Write levelling parameters as:

 

     0x021b080c =     0x001F001F   

     0x021b0810 =     0x001F001F   

     0x021b480c =     0x001F001F   

     0x021b4810 =     0x001F001F

 

and output values are:

 

Start write leveling calibration

Write leveling calibration completed

Start write leveling calibration

Write leveling calibration completed

MMDC_MPWLDECTRL0 ch0 after write level cal: 0x004E0051

MMDC_MPWLDECTRL1 ch0 after write level cal: 0x00420048

MMDC_MPWLDECTRL0 ch1 after write level cal: 0x00330031

MMDC_MPWLDECTRL1 ch1 after write level cal: 0x0030003F

 

could please help me, the output values are larger than configured values?

 

Do i need to change any configuration parameters.

 

Please suggest me.

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