Does DDR4 in general require periodic retraining, or is that just an LPDDR4 requirement? I can't seem to find much reference to DDR4 periodic retraining, but it's hard to prove a negative through the lack of search results :-)
-
-
Replying to @delroth_
I had no idea what that was so I got interested. I found this: http://s-space.snu.ac.kr/bitstream/10371/136802/1/000000145238.pdf … "periodic training is required to compensate for voltage and temperature variations" Then: https://mail.coreboot.org/pipermail/coreboot-gerrit/2016-October/051732.html … (Look LPDDR4 Periodic Retraining) and thishttps://electronics.stackexchange.com/questions/301677/whats-the-standard-procedure-of-ddr4-training …
2 replies 0 retweets 0 likes -
Replying to @matiasgoldberg @delroth_
So all points out that training is needed in all memory, but periodic retraining is to adapt to varying voltage and temperatures, which makes sense on a phone (LPDDR) but not on a desktop. Thanks for expanding my knowledge.
1 reply 0 retweets 0 likes -
Replying to @matiasgoldberg
Varying temperature should definitely apply on a desktop though, and even more on a laptop.
1 reply 0 retweets 0 likes -
Replying to @delroth_
Everything points to training being done only on boot for DDR4. See http://www.oldfriend.url.tw/article/SI/TN_4040_DDR4_Point_to_Point_Design_Guide.pdf … https://www.jedec.org/sites/default/files/JS_Choi_DDR4_miniWorkshop.pdf … (slide 10) and http://www.xilinx.com/Attachment/Xilinx_Answer_60305_rev_2014_4.pdf …
2 replies 0 retweets 0 likes
Thanks for the pointers. I wonder what makes LPDDR4 so different in that regards then. Voltage changes would be my best guess.
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.