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why the I/O level is not right?

Altera_Forum
Honored Contributor II
‎12-22-2005 07:51 AM
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hi: i met a very strange phenomenon! 

i define a bidir port named daccontrol[1..0],then i write the direction register so that i could define it as a output port, THEN I OUTPUT A "1" TO daccontrol[1] 

or daccontrol[0],in theory one of them should be3.3v ,another should be 0v,BUT BOTH OF THEM SHOW 2V! 

I have tried many times! when i write "1" to both daccontrol[1] and daccontrol[0],they show right! so is the data[0]! 

thanks !! with my regards!
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