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OMAPL137-HT: Relationship between Power sequence and EMIF

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Part Number:OMAPL137-HT

Hi, All

I have two types of board with OMAPL137. One of the two types, is designed without "Power-on sequence."
At first both types were fully functional but, few monthes later, one without the "Power-on sequence" had a common problem.
Communicating with SDRAM failed and I think EMIFB_CLK is the main cause, could there be other cause?
Does not keeping the boot sequence cause similar problems? Like LATCH-UP?

* EMIFB_Clock


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