Quote Originally Posted by Agent-Sharp
What I have to say about RMMA.
- The program does not seem to display actual values and it rounds to either 3.9/7.8/15.6
- Using 200Mhz/5ns and max tREF cycles in the BIOS RMMA displayed N/A
- Using 200Mhz/5ns and 0016 RMMA displayed 3.9us.
- And it did not work for 100Mhz.
I think RMMA reads the Bits 4-3 of Tref register and then converts these bits in us:
00 -> 15.6us
01 -> 7.8 us
10 -> 3.9 us
11 -> N/A
If you see my table (still under construction) you'll notice that 388 and 16 are under the 3.9 us group so i'm agree with your RMMA results.
I think that if you try a xx us value RMMA will display xx us no matters what divider you set.
The max Tref Cycle (4708) has the bits 4-3 = 11, for this reason RMMA shows N/A.
Moreover the bottom 2064 value is 01101 and then is taken by RMMA as a 7.8 us value.