DRAM_Tester
44256 / 4464 Dram Tester with Arduino
DRAM_Tester folder : KiCAD schematics and gerber files for arduino nano (or pro-mini)
DRAM_Testers : Arduino source
my blog posting (korean) :
https://blog.naver.com/cloudree/221388540394
https://blog.naver.com/cloudree/221524164049
Good Luck!