Hello, I'm working on a design that uses the E310 DRAM connected to the PL. There appears to be a discrepancy in the clocking scheme and power of the DRAM. If I look up the power of the DRAM part on Micron's website (https://www.micron.com/parts/dram/ddr3-sdram/mt41k256m16ha-125-it) it says it runs at 1.35V. But the MIG is set to 1.5V. Also the MIG says the two clocks are 400MHz and 100MHz. But following the design it appears that the two clocks are 200MHz and 50MHz. Can someone help me resolve these discrepancies? Thanks, -Kevin

Hello Rigney, The L in DDR3L RAM stands for "Low Voltage". This means it CAN run on 1.35V, but it also supports the standard DDR3 voltage of 1.5V (I would risk to say that by doing so it could achieve lower latencies, but I'm not really sure). As to the clock speeds, I'm not sure. Maybe it has to do with the fact that DDR transmits data both on raising and falling edges of the clock signals? Sometimes manufacturers use MHz incorrectly, when they actually mean MT/s (Mega Transfers per second). Hope it helps, Leo. On Fri, Jun 23, 2017 at 1:17 PM Rigney, Kevin E via USRP-users < usrp-users@lists.ettus.com> wrote: > Hello, > > > > I’m working on a design that uses the E310 DRAM connected to the PL. There > appears to be a discrepancy in the clocking scheme and power of the DRAM. > > > > If I look up the power of the DRAM part on Micron’s website ( > https://www.micron.com/parts/dram/ddr3-sdram/mt41k256m16ha-125-it) it > says it runs at 1.35V. But the MIG is set to 1.5V. > > > > Also the MIG says the two clocks are 400MHz and 100MHz. But following the > design it appears that the two clocks are 200MHz and 50MHz. > > > > Can someone help me resolve these discrepancies? > > > > Thanks, > > > > -Kevin > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >