DDR3L-1066 speed support in SABRE design

[talents_titus]

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. 

[gusarambula]

Hello Talent Titus,

Most DDR memories are backwards compatible in that they can work on lower clock speeds, just double check on the DDR documentation.

When working on the new DDR setup you may use the i.MX7D DRAM Register Programming Aid:

https://community.nxp.com/docs/DOC-152468

I hope this helps!

Regards,

[talents_titus]

Thank you for the reply.