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Function of EMI pin keeper for i.MX28

Question asked by ko-hey on May 14, 2018
Latest reply on May 25, 2018 by Yuri Muhin

Hi all

 

Let me confirm about a function of "Keeper” which is described in reference manual.

I'm confused about that.

 

Q1.

There are two words which are very similar.

One is "Internal Keeper”, the other is "Pad keeper”.

Is it same meaning ?

 

Q2.

There are following description in 9.1 Pin Control and GPIO Overview.

 

"All EMI pins' internal keepers can be disabled to allow them to change to a highimpedance

state (as required by some DRAM manufacturers).”

 

How can I judge whether DRAM manufactures require a high impedance state or not ?

 

 

Ko-hey

 

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