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Question about slew rate settings

Question asked by ko-hey on Jun 23, 2016
Latest reply on Jun 26, 2016 by ko-hey

Hi all

 

I'm developing a custom board with i.MX6SL and have questions about slew rate.

 

 

Q1

There are following description in chapter 26.4.2.2 in RM.

http://cache.nxp.com/files/32bit/doc/ref_manual/IMX6SLRM.pdf?fpsp=1&WT_TYPE=Reference%20Manuals&WT_VENDOR=FREESCALE&WT_F…

 

"Additional 2-bit slew rate control to select between 50, 100, and 200 MHz IO cell operation range with reduced switching noise"

 

I think that those settings correspond to "SPEED" field in Pad Control Register. Am I correct ?

Those are cutoff frequency. Am I correct ?

 

 

Q2

If Q1 is correct, both of "SPEED" field and "SRE" field are correspond to slew rate.

What the difference between them ?

 

 

Q3

There is "SRE" field in Pad Control Register and it have "SLOW" and "FAST" settings.

Are there specific value to each settings ?

 

 

 

Ko-hey

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