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EMX and IO21


I can see that the FEZ Cobra uses IO21 for EMX / Cobra board detection. Since I am integrating an EMX into my design, I was going to pull up that pin so it knows it is an EMX.

I guess my question is, is it necessary to do that? Does 4.2 even check this pin anymore?


@ High-Speed Dan

This pin is not required. It is up to you if you wish to use it.


@ Aron - thanks Aron for clarifying!