Hi Chip experts,
In spite of DDR2 calibration applied, LCD screen unstable occured immediately after bootup.
It seems DDR2 write was OK but failed at read&write.
5 min after bootup, LCD screen looked quite stable.
So I checked difference and found low output of DRAM_SDWE slightly higher around 400mV againt 200mV@5min have passed.
(Q) What's the reason of DRAM_SDWE level drifted?
(Q) Is it possible to enhance ZQ during bootup in order to avoid screen unstable?
Can anyone help me?