I have a question about i.MX6 document,
p.3848, Table 44-8. MMDC Refresh Scheme.
The column "Description" of the table describes,
|1||31,250 ns||64 KHz|
|2||15,625 ns||32 KHz|
I understood the interval time in "Description" is related to REF_SEL, but I couldn't understand how to calculate.
My question is how to calculate the interval time described in "Description".
It seems the time is not inverse number of the frequency(REF_SEL).
However this interval time seems right from my experiment using DDR Stress Test.
I tried two test case (REFR is same value for purpose),
(1) REFR=0x3 REF_SEL=0 (64KHz)
(2) REFR=0x3 REF_SEL=1 (32KHz)
and (1) was failed within 400~500 loops, (2) was continued over 1000 loops.
Thanks in advance,