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Scope of notes in register_programming_aid for the i.MX6 DDR Stress Test Tool

Question asked by torus1000 on Oct 15, 2019
Latest reply on Oct 15, 2019 by igorpadykov

Hi,

I'm checking DDR memory timings of my i.MX6Q board now.
I would like to change REF_SEL to choose 64kHz in terms of testing half refresh cycle of DDR3 memory.
Then I found a Note for REFR bit in MDREF register which described as following.


      MX6Q_SabreSD_DDR3_register_programming_aid_v2.3.xlsx
      https://community.nxp.com/docs/DOC-105963

      See $F$125;

"MDREF register setting. Note, only parameter REFR is programmable, all other parameters are fixed as follows:
REF_CNT: 0x0 (default value, parameter not used)
REF_SEL: 0x1 (choose 32KHz clock to trigger refresh cycle)
START_REF: Manually start refresh cycle, set to 0 for normal operations"

I'm confusing there is no such description in ref manual; REF_SEL is fixed.

 

(Q)  Scope of this Notes are just for the calibration purpose, right?
       (Can I ignore this Note when I test another DDR refresh rate?)

 

Can anyone help me?

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