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Valued Contributor III
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Problem With Quartus 2 And Hi-z

Hello,  

i have an entity with 38 bidirectional lines (IO). I have a process that initialize a temporary signal (st_logic-vector) to Z (so i have 38 Z):  

IOtemp<=ZZZZZZZ...;  

 

When a control signal goes to '1' this temporary signal is filled with 1 or 0 in precise positions (so i have this 38 lines signal with some 0, some 1 and others line with Z). eg;  

 

IOtemp<=ZZ1Z01Z......;  

 

After filling the IOtemp signal, this IOtemp signal is copied to bidirectional lines:  

 

IO<=IOtemp;  

 

but if i simulate the .vho file from quartus in my ActiveHDL project the line that must be Z (high impedance) are 0 or 1 and the others lines are correct.  

 

All signal are std_logic_vector 

 

Why?  

 

Please help me. Thanks  

Nick
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Valued Contributor III
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do you have a test case code i can synthesize?

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