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i.MX6 uSDHC Delay-line

Question asked by Zongbiao Liao on Oct 31, 2016

Hello Community

 

About i.MX6 uSDHC DLL, I have some questions.

 

In uSDHCx_DLL_STATUS register, there are two concepts:Reference Delay-line and Slave Delay-line.

Q1:

What are Reference Delay-line and Slave Delay-line?

 

Q2:

What is the relationship between Reference Delay-line and Slave Delay-line?

 

Q3:

I dumped the registers related to uSDHC4 on i.MX6SabreSd board.And I found that uSDHC4_DLL_CTRL is 0x00000000, which means that DLL is disabled.

But uSDHC4_DLL_STATUS is 0x00000200, which means that Reference delay line select taps is 2.

So why is Reference DLL  2 when DLL is disabled.

 

Thank you!

 

ZongbiaoLiao

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