Duan huayang has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/40525 )
Change subject: soc/mediatek/mt8183: Use term settings for high DRAM frequency ......................................................................
Patch Set 8:
(1 comment)
Patch Set 8:
(1 comment)
https://review.coreboot.org/c/coreboot/+/40525/7//COMMIT_MSG Commit Message:
https://review.coreboot.org/c/coreboot/+/40525/7//COMMIT_MSG@11 PS7, Line 11: should enable the term to improve the signal integrity.
Can you put a reference for where these description come from? Something like […]
this is from JEDEC STANDARD <JESD209-4B.pdf>
4.29 Command Bus Training The LPDDR4-SDRAM command bus must be trained before enabling termination for high-frequency operation. LPDDR4 provides an internal VREF(CA) that defaults to a level suitable for un-terminated, low frequency operation, but the VREF(CA) must be trained to achieve suitable receiver voltage margin for terminated, high-frequency operation.