AnsweredAssumed Answered

About DDR3 DQ signal behavior by ODT changing in i.MX6DQ.

Question asked by Keita Nagashima on Oct 28, 2015
Latest reply on Nov 9, 2015 by Keita Nagashima

Dear All,

 

Hello. I have a question about DDR3 DQ signal behavior by ODT changing in i.MX6DQ.

We measured the waveforms with changing ODT in i.MX6 or DDR3.

But, we didn't understand about result of measurement waveform.

 

[Q1]

Refer to "2. DDR ODT --> OFF @Custom board" in attached sheet.

In write operation, I think that the waveform quality should be changed by off the DDR3's ODT.

But, the waveform didn't be changed.

Why did it become such behavior?

 

[Q2]

Refer to "4. i.MX6 ODT --> OFF  && DDR ODT--> OFF" in attached sheet.

In write operation, I think that the waveform quality should not be changed by off the i.MX6's ODT.

But, the waveform quality became bad.

Why did it become such behavior?

 

 

This question is related to the following thread.

https://community.freescale.com/message/558926#558926

 

Best Regards,

Keita

Outcomes