https://js3.maisonikkoku.com/uncategorized/ddr3-controller
https://forum.digilent.com/topic/22165-examples-of-using-the-ddr3-on-arty-s7-board/ https://digilent.com/reference/programmable-logic/guides/getting-started-with-ipi https://forum.digilent.com/topic/22197-a-guide-to-using-ddr-in-the-all-hdl-design-flow