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.
"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?