I'm currently working on an i.Mx 7D based design, so I use SABRE as my reference. My requirements expect me to include 8Gb DDR3L (Two 4Gb x16 configuration) as per SABRE, but I found that Micron currently doesn't support (backward compatible) DDR3L-1066 4Gb, (referred the DDR3L-2133 datasheet which supports btoth 1866 and 1600). Based on the reference design, SABRE uses DDR3L-1866 (MT41K256M16TW-107:P). So how do they achieve it and is it fine to use the same part or do I need to go with another configuration? Thanks in advance.