question in inout port

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hossam abdo

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in vhdl , when i define port as inout and do some operation on it then do the simulation
when i assign it as in (first time) work right
then assign it as out work right
but when assigning it as in again don't work
why this?!

thanks in advance
 

by default drive 'Z' to your inout port "inout_port <= 'Z';", and after drive what you want.
 

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