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GPIO - problem defining input and output pin on the same gpio connector...

Altera_Forum
Honored Contributor II
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Hello everyones! 

 

I know this is a fairly basic question but this puzzel me a lot... I have tried to do a simple loopback on two pins (A0 and A1 on the same GPIO connector on a DE2 kit) defining one as input and the other as output and shorting both pins together but (I know...it is too simple to work!!) Quartus is telling me I cant do that. By defining both pins as inout it work... 

 

Anyones care to explain why? I dont want to stay in that puzzel state the rest of my life!
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