[Arm-netbook] DDR3 RAM Design Rules and Techniques

[Paul Boddie]

Hello,

One thing that just came up in another forum is the matter of routing PCB 
tracks for DDR3 RAM, and this is probably a topic that was encountered by both 
the Pyra...

https://pyra-handheld.com/boards/threads/analyzing-4gb-ram.81687/

https://pyra-handheld.com/boards/threads/is-there-really-a-light-at-the-end-of-the-journey.83007/

...and the EOMA68 initiatives. Is there any pertinent documentation describing 
this exercise in the EOMA68 board design process? Searching for DDR3 on the 
Rhombus Tech site [*] indicates that some boards were done with guidance (at 
some level) from the vendors:

http://rhombus-tech.net/ingenic/jz4775/news/11jul2014_routing_completed/

http://rhombus-tech.net/allwinner/a31/news/

Previous discussions of KiCad and Olimex boards, which presumably involved 
DDR3 routing, can be found via this message:

http://lists.phcomp.co.uk/pipermail/arm-netbook/2019-May/016062.html

I ask about this in the context of someone who just made design files 
available for a board using the Ingenic JZ4780 that they had been working on. 
Those files are here:

https://gitlab.com/igagis/cranberrypi

Paul

[*] http://rhombus-tech.net/cgi-bin/rhombus/ikiwiki.cgi?P=DDR3