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i.MX53 DDR2 calibration and DRAM_SDWE drift

Question asked by torus1000 on Jul 7, 2015
Latest reply on Jul 12, 2015 by torus1000

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?

 

Best Regards.

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