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EIM Clock Frequency in I.MX6

Question asked by Tom Dickson on Mar 3, 2014
Latest reply on Nov 14, 2014 by Robbie Jiang

In the i.MX6 Dual/Quad Reference Manual, the EIM Clock maximum frequency is given as 133 MHz(page 1005).  Again, on page 1012, the ACLK, which I assume is the same as AXI clock and is the same as the EIM clock, has a maximum frequency of 133 MHz.

 

I assume the default value of the EIM clock is 133 MHz.  However, on page 1027-1028, the 133 MHz clock is divided by 2 to get 66 MHz.  That should be 66.5 MHz.  That implies the EIM clock frequency is 132 MHz exactly.

 

Page 1056 mentions a EIM clock frequency of 104 MHz which seems to be an optional frequency.

 

On page 81 of the iMX6 Firmware Guide, EIM clock root frequency is given as 132 MHz.

 

In the i.MX6 Dual/Quad Applications Processor for Industrial Products data sheet, on page 50, note 2 says the maximum EIM operating frequency is 104 MHz.

 

Page 56 in the same document has a column title of "Max (If 132 MHz is supported by SoC)".

 

So, what is the default frequency of the EIM clock, exactly? 133.0 MHz? 132.0 MHz? 104.0 MHz?

 

And, how does one change the frequency of the EIM clock?

 

Thanks,

Tom

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