Hi,
On section 45.4.4.2 “Chip select settings” of the i.MX6S Reference Manual, you could check some examples of DDR addressing.
Regarding reference boards using the i.MX6S, you could take a look to the RIoTboard (uses 16bit DDR3). You could get the schematics at the following link:
https://www.element14.com/community/docs/DOC-65504/l/riotboard-schematics-for-riotboard
On the “Hardware Development Guide for i.MX 6Quad, 6Dual, 6DualLite, 6Solo Families of Applications Processors” document you could find useful information regarding DDR connection information and routing rules. This document is available at the link below:
http://www.nxp.com/files/32bit/doc/user_guide/IMX6DQ6SDLHDG.pdf
Finally, this other link could provide helpful information:
http://www.fedevel.com/welldoneblog/2014/06/ddr3-length-matching-rules/
Hope this will be useful for you.
Best regards!
/Carlos
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