Some idea about how to set the ram timings over ddr 900

[Onepagebook]

most likely(in general situation for RAM timings under normal voltage usage) here is the setting over 900:

CL:4

Trtc: 4(or TRCD)

TRP: 3

TRAS: 4~8

RMS (only in 975x):7.8 mu-s or 15.6 mu-s

subtimings:

Page Close idle Timer: 16t

TRFC: 900~1000 for 25~30; over ddr1000~1066: 30~38

Read delay: you can try 6 first, but I am pretty sure that you need 7 for stable result in 32m calculation

write to precharge command: normally 900 can be 10 or 11, over ddr1000 you will need 11~13

write to read command: definitely 10~11

read-write turn around: 7

write read turn around: 4~5

read to precharge: 4 under dr 1000,

hope this helps

OPB

 

[maverik-sg1]

Nice information - thanks for sharing OPB.

Mav

 

[Barkerd]

I need to do this shortly so thanks for sharing ...

Dave