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DRAM register setting of i.MX7D

Question asked by ko-hey on Jan 16, 2017
Latest reply on Jan 17, 2017 by Yuri Muhin

Hi all

 

My customer plan to use i.MX7D and LPDDR2 and have two questions about DRAM register setting.

 

About ZQ_RESISTOR_SHARED

 Would you teach me how to decide the value of ZQ_RESISTOR_SHARED register setting ?

 Is it depend on the type of DRAM memory ? 

 

 

About WR_ODT_HOLD

 

The description for WR_ODT_HOLD register is only for DDR3 in reference manual.

Which value should I set to the register when I use LPDDR2 ?

Can I leave it for the default settings?

Or do I need to set the value of tDQSS from the DRAM data sheet ?

 

If I need to set the value of tDQSS, there are min and max value of it in the DRAM datasheet so please teach me which value is correct.

 

 

 Ko-hey

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